/*
 * Edgeport USB Serial Converter driver
 *
 * Copyright (C) 2000 Inside Out Networks, All rights reserved.
 * Copyright (C) 2001-2002 Greg Kroah-Hartman <greg@kroah.com>
 *
 *	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.
 *
 * Supports the following devices:
 *	Edgeport/4
 *	Edgeport/4t
 *	Edgeport/2
 *	Edgeport/4i
 *	Edgeport/2i
 *	Edgeport/421
 *	Edgeport/21
 *	Rapidport/4
 *	Edgeport/8
 *	Edgeport/2D8
 *	Edgeport/4D8
 *	Edgeport/8i
 *
 * For questions or problems with this driver, contact Inside Out
 * Networks technical support, or Peter Berger <pberger@brimson.com>,
 * or Al Borchers <alborchers@steinerpoint.com>.
 *
 * Version history:
 * 
 * 2003_04_03 al borchers
 *  - fixed a bug (that shows up with dosemu) where the tty struct is
 *    used in a callback after it has been freed
 *
 * 2.3 2002_03_08 greg kroah-hartman
 *	- fixed bug when multiple devices were attached at the same time.
 *
 * 2.2 2001_11_14 greg kroah-hartman
 *	- fixed bug in edge_close that kept the port from being used more
 *	  than once.
 *	- fixed memory leak on device removal.
 *	- fixed potential double free of memory when command urb submitting
 *	  failed.
 *	- other small cleanups when the device is removed
 *	
 * 2.1 2001_07_09 greg kroah-hartman
 *	- added support for TIOCMBIS and TIOCMBIC.
 *
 *     (04/08/2001) gb
 *	- Identify version on module load.
 *
 * 2.0 2001_03_05 greg kroah-hartman
 *	- reworked entire driver to fit properly in with the other usb-serial
 *	  drivers.  Occasional oopses still happen, but it's a good start.
 *
 * 1.2.3 (02/23/2001) greg kroah-hartman
 *	- changed device table to work properly for 2.4.x final format.
 *	- fixed problem with dropping data at high data rates.
 *
 * 1.2.2 (11/27/2000) greg kroah-hartman
 *	- cleaned up more NTisms.
 *	- Added device table for 2.4.0-test11
 *
 * 1.2.1 (11/08/2000) greg kroah-hartman
 *	- Started to clean up NTisms.
 *	- Fixed problem with dev field of urb for kernels >= 2.4.0-test9
 *
 * 1.2 (10/17/2000) David Iacovelli
 * 	Remove all EPIC code and GPL source
 *  Fix RELEVANT_IFLAG macro to include flow control 
 *  changes port configuration changes.
 *  Fix redefinition of SERIAL_MAGIC
 *  Change all timeout values to 5 seconds
 *  Tried to fix the UHCI multiple urb submission, but failed miserably.
 *  it seems to work fine with OHCI.
 *  ( Greg take a look at the #if 0 at end of WriteCmdUsb() we must 
 *    find a way to work arount this UHCI bug )
 *
 * 1.1 (10/11/2000) David Iacovelli
 *  Fix XON/XOFF flow control to support both IXON and IXOFF
 *
 * 0.9.27 (06/30/2000) David Iacovelli
 *  Added transmit queue and now allocate urb for command writes.
 *
 * 0.9.26 (06/29/2000) David Iacovelli
 *  Add support for 80251 based edgeport
 *
 * 0.9.25 (06/27/2000) David Iacovelli
 *  Do not close the port if it has multiple opens.
 *
 * 0.9.24 (05/26/2000) David Iacovelli
 *  Add IOCTLs to support RXTX and JAVA POS 
 *  and first cut at running BlackBox Demo
 *
 * 0.9.23 (05/24/2000) David Iacovelli
 *  Add IOCTLs to support RXTX and JAVA POS
 *
 * 0.9.22 (05/23/2000) David Iacovelli
 *  fixed bug in enumeration.  If epconfig turns on mapping by
 *  path after a device is already plugged in, we now update
 *  the mapping correctly
 *
 * 0.9.21 (05/16/2000) David Iacovelli
 *  Added BlockUntilChaseResp() to also wait for txcredits
 *  Updated the way we allocate and handle write URBs 
 *	Add debug code to dump buffers
 *
 * 0.9.20 (05/01/2000) David Iacovelli
 *	change driver to use usb/tts/
 *
 * 0.9.19 (05/01/2000) David Iacovelli
 *  Update code to compile if DEBUG is off
 *
 * 0.9.18 (04/28/2000) David Iacovelli
 *  cleanup and test tty_register with devfs
 *
 * 0.9.17 (04/27/2000) greg kroah-hartman
 * 	changed tty_register around to be like the way it
 * 	was before, but now it works properly with devfs.
 *
 * 0.9.16 (04/26/2000) david iacovelli
 *  Fixed bug in GetProductInfo()
 *
 * 0.9.15 (04/25/2000) david iacovelli
 *	Updated enumeration
 *
 * 0.9.14 (04/24/2000) david iacovelli
 *  Removed all config/status IOCTLS and 
 *  converted to using /proc/edgeport
 *  still playing with devfs
 *
 * 0.9.13 (04/24/2000) david iacovelli
 *  Removed configuration based on ttyUSB0
 *  Added support for configuration using /prod/edgeport
 *  first attempt at using devfs (not working yet!)
 *  Added IOCTL to GetProductInfo()
 *  Added support for custom baud rates
 *	Add support for random port numbers
 *
 * 0.9.12 (04/18/2000) david iacovelli
 *	added additional configuration IOCTLs
 *  use ttyUSB0 for configuration
 *
 * 0.9.11 (04/17/2000) greg kroah-hartman
 *	fixed module initialization race conditions.
 *	made all urbs dynamically allocated.
 *	made driver devfs compatible. now it only registers the tty device
 *	when the device is actually plugged in.
 *
 * 0.9.10 (04/13/2000) greg kroah-hartman
 *	added proc interface framework.
 *
 * 0.9.9 (04/13/2000) david iacovelli
 *	added enumeration code and ioctls to configure the device
 *
 * 0.9.8 (04/12/2000) david iacovelli
 *  Change interrupt read start when device is plugged in
 *  and stop when device is removed
 *	process interrupt reads when all ports are closed 
 *  (keep value of rxBytesAvail consistent with the edgeport)
 *  set the USB_BULK_QUEUE flag so that we can shove a bunch 
 *  of urbs at once down the pipe 
 *
 * 0.9.7 (04/10/2000) david iacovelli
 * 	start to add enumeration code.
 *  generate serial number for epic devices
 *  add support for kdb
 *
 * 0.9.6 (03/30/2000) david iacovelli
 *  add IOCTL to get string, manufacture, and boot descriptors
 *
 * 0.9.5 (03/14/2000) greg kroah-hartman
 *	more error checking added to SerialOpen to try to fix UHCI open problem
 *
 * 0.9.4 (03/09/2000) greg kroah-hartman
 *	added more error checking to handle oops when data is hanging
 *	around and tty is abruptly closed.
 *
 * 0.9.3 (03/09/2000) david iacovelli
 *	Add epic support for xon/xoff chars
 *	play with performance
 *
 * 0.9.2 (03/08/2000) greg kroah-hartman
 *	changed most "info" calls to "dbg"
 *	implemented flow control properly in the termios call
 *
 * 0.9.1 (03/08/2000) david iacovelli
 *	added EPIC support
 *	enabled bootloader update
 *
 * 0.9 (03/08/2000) greg kroah-hartman
 *	Release to IO networks.
 *	Integrated changes that David made
 *  made getting urbs for writing SMP safe
 *
 * 0.8 (03/07/2000) greg kroah-hartman
 *	Release to IO networks.
 *	Fixed problems that were seen in code by David.
 *  Now both Edgeport/4 and Edgeport/2 works properly.
 *  Changed most of the functions to use port instead of serial.
 *
 * 0.7 (02/27/2000) greg kroah-hartman
 *	Milestone 3 release.
 *	Release to IO Networks
 *	ioctl for waiting on line change implemented.
 *	ioctl for getting statistics implemented.
 *	multiport support working.
 *	lsr and msr registers are now handled properly.
 *	change break now hooked up and working.
 *	support for all known Edgeport devices.
 *
 * 0.6 (02/22/2000) greg kroah-hartman
 *	Release to IO networks.
 *	CHASE is implemented correctly when port is closed.
 *	SerialOpen now blocks correctly until port is fully opened.
 *
 * 0.5 (02/20/2000) greg kroah-hartman
 *	Release to IO networks.
 *	Known problems:
 *		modem status register changes are not sent on to the user
 *		CHASE is not implemented when the port is closed.
 *
 * 0.4 (02/16/2000) greg kroah-hartman
 *	Second cut at the CeBit demo.
 *	Doesn't leak memory on every write to the port
 *	Still small leaks on startup.
 *	Added support for Edgeport/2 and Edgeport/8
 *
 * 0.3 (02/15/2000) greg kroah-hartman
 *	CeBit demo release.
 *	Force the line settings to 4800, 8, 1, e for the demo.
 *	Warning! This version leaks memory like crazy!
 *
 * 0.2 (01/30/2000) greg kroah-hartman
 *	Milestone 1 release.
 *	Device is found by USB subsystem, enumerated, fimware is downloaded
 *	and the descriptors are printed to the debug log, config is set, and
 *	green light starts to blink. Open port works, and data can be sent
 *	and received at the default settings of the UART. Loopback connector
 *	and debug log confirms this.
 * 
 * 0.1 (01/23/2000) greg kroah-hartman
 *	Initial release to help IO Networks try to set up their test system. 
 *	Edgeport4 is recognized, firmware is downloaded, config is set so 
 *	device blinks green light every 3 sec. Port is bound, but opening,
 *	closing, and sending data do not work properly.
 * 
 */

#include <linux/config.h>
#include <linux/kernel.h>
#include <linux/jiffies.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 <linux/serial.h>
#include <linux/ioctl.h>
#include <asm/uaccess.h>
#include <linux/usb.h>
#include "usb-serial.h"
#include "io_edgeport.h"
#include "io_ionsp.h"		/* info for the iosp messages */
#include "io_16654.h"		/* 16654 UART defines */

/*
 * Version Information
 */
#define DRIVER_VERSION "v2.7"
#define DRIVER_AUTHOR "Greg Kroah-Hartman <greg@kroah.com> and David Iacovelli"
#define DRIVER_DESC "Edgeport USB Serial Driver"

/* First, the latest boot code - for first generation edgeports */
#define IMAGE_ARRAY_NAME	BootCodeImage_GEN1
#define IMAGE_VERSION_NAME	BootCodeImageVersion_GEN1
#include "io_fw_boot.h"		/* the bootloader firmware to download to a device, if it needs it */

/* for second generation edgeports */
#define IMAGE_ARRAY_NAME	BootCodeImage_GEN2
#define IMAGE_VERSION_NAME	BootCodeImageVersion_GEN2
#include "io_fw_boot2.h"	/* the bootloader firmware to download to a device, if it needs it */

/* Then finally the main run-time operational code - for first generation edgeports */
#define IMAGE_ARRAY_NAME	OperationalCodeImage_GEN1
#define IMAGE_VERSION_NAME	OperationalCodeImageVersion_GEN1
#include "io_fw_down.h"		/* Define array OperationalCodeImage[] */

/* for second generation edgeports */
#define IMAGE_ARRAY_NAME	OperationalCodeImage_GEN2
#define IMAGE_VERSION_NAME	OperationalCodeImageVersion_GEN2
#include "io_fw_down2.h"	/* Define array OperationalCodeImage[] */

#define MAX_NAME_LEN		64

#define CHASE_TIMEOUT		(5*HZ)		/* 5 seconds */
#define OPEN_TIMEOUT		(5*HZ)		/* 5 seconds */
#define COMMAND_TIMEOUT		(5*HZ)		/* 5 seconds */

/* receive port state */
enum RXSTATE {
	EXPECT_HDR1 = 0,	/* Expect header byte 1 */
	EXPECT_HDR2 = 1,	/* Expect header byte 2 */
	EXPECT_DATA = 2,	/* Expect 'RxBytesRemaining' data */
	EXPECT_HDR3 = 3,	/* Expect header byte 3 (for status hdrs only) */
};


/* Transmit Fifo 
 * This Transmit queue is an extension of the edgeport Rx buffer. 
 * The maximum amount of data buffered in both the edgeport 
 * Rx buffer (maxTxCredits) and this buffer will never exceed maxTxCredits.
 */
struct TxFifo {
	unsigned int	head;	/* index to head pointer (write) */
	unsigned int	tail;	/* index to tail pointer (read)  */
	unsigned int	count;	/* Bytes in queue */
	unsigned int	size;	/* Max size of queue (equal to Max number of TxCredits) */
	unsigned char	*fifo;	/* allocated Buffer */
};

/* This structure holds all of the local port information */
struct edgeport_port {
	__u16			txCredits;		/* our current credits for this port */
	__u16			maxTxCredits;		/* the max size of the port */

	struct TxFifo		txfifo;			/* transmit fifo -- size will be maxTxCredits */
	struct urb		*write_urb;		/* write URB for this port */
	char			write_in_progress;	/* TRUE while a write URB is outstanding */
	spinlock_t		ep_lock;

	__u8			shadowLCR;		/* last LCR value received */
	__u8			shadowMCR;		/* last MCR value received */
	__u8			shadowMSR;		/* last MSR value received */
	__u8			shadowLSR;		/* last LSR value received */
	__u8			shadowXonChar;		/* last value set as XON char in Edgeport */
	__u8			shadowXoffChar;		/* last value set as XOFF char in Edgeport */
	__u8			validDataMask;
	__u32			baudRate;

	char			open;
	char			openPending;
	char			commandPending;
	char			closePending;
	char			chaseResponsePending;

	wait_queue_head_t	wait_chase;		/* for handling sleeping while waiting for chase to finish */
	wait_queue_head_t	wait_open;		/* for handling sleeping while waiting for open to finish */
	wait_queue_head_t	wait_command;		/* for handling sleeping while waiting for command to finish */
	wait_queue_head_t	delta_msr_wait;		/* for handling sleeping while waiting for msr change to happen */

	struct async_icount	icount;
	struct usb_serial_port	*port;			/* loop back to the owner of this object */
};


/* This structure holds all of the individual device information */
struct edgeport_serial {
	char			name[MAX_NAME_LEN+1];		/* string name of this device */

	struct edge_manuf_descriptor	manuf_descriptor;	/* the manufacturer descriptor */
	struct edge_boot_descriptor	boot_descriptor;	/* the boot firmware descriptor */
	struct edgeport_product_info	product_info;		/* Product Info */

	__u8			interrupt_in_endpoint;		/* the interrupt endpoint handle */
	unsigned char *		interrupt_in_buffer;		/* the buffer we use for the interrupt endpoint */
	struct urb *		interrupt_read_urb;		/* our interrupt urb */

	__u8			bulk_in_endpoint;		/* the bulk in endpoint handle */
	unsigned char *		bulk_in_buffer;			/* the buffer we use for the bulk in endpoint */
	struct urb *		read_urb;			/* our bulk read urb */
	int			read_in_progress;
	spinlock_t		es_lock;

	__u8			bulk_out_endpoint;		/* the bulk out endpoint handle */

	__s16			rxBytesAvail;			/* the number of bytes that we need to read from this device */

	enum RXSTATE		rxState;			/* the current state of the bulk receive processor */
	__u8			rxHeader1;			/* receive header byte 1 */
	__u8			rxHeader2;			/* receive header byte 2 */
	__u8			rxHeader3;			/* receive header byte 3 */
	__u8			rxPort;				/* the port that we are currently receiving data for */
	__u8			rxStatusCode;			/* the receive status code */
	__u8			rxStatusParam;			/* the receive status paramater */
	__s16			rxBytesRemaining;		/* the number of port bytes left to read */
	struct usb_serial	*serial;			/* loop back to the owner of this object */
};

/* baud rate information */
struct divisor_table_entry {
	__u32   BaudRate;
	__u16  Divisor;
};

//
// Define table of divisors for Rev A EdgePort/4 hardware
// These assume a 3.6864MHz crystal, the standard /16, and
// MCR.7 = 0.
//
static struct divisor_table_entry divisor_table[] = {
	{   50,		4608},  
	{   75,		3072},  
	{   110,	2095},		/* 2094.545455 => 230450   => .0217 % over */
	{   134,	1713},		/* 1713.011152 => 230398.5 => .00065% under */
	{   150,	1536},
	{   300,	768},
	{   600,	384},
	{   1200,	192},
	{   1800,	128},
	{   2400,	96},
	{   4800,	48},
	{   7200,	32},
	{   9600,	24},
	{   14400,	16},
	{   19200,	12},
	{   38400,	6},
	{   57600,	4},
	{   115200,	2},
	{   230400,	1},
};

/* local variables */
static int debug;

static int low_latency = 1;	/* tty low latency flag, on by default */

static int CmdUrbs = 0;		/* Number of outstanding Command Write Urbs */


/* local function prototypes */

/* function prototypes for all URB callbacks */
static void edge_interrupt_callback	(struct urb *urb, struct pt_regs *regs);
static void edge_bulk_in_callback	(struct urb *urb, struct pt_regs *regs);
static void edge_bulk_out_data_callback	(struct urb *urb, struct pt_regs *regs);
static void edge_bulk_out_cmd_callback	(struct urb *urb, struct pt_regs *regs);

/* function prototypes for the usbserial callbacks */
static int  edge_open			(struct usb_serial_port *port, struct file *filp);
static void edge_close			(struct usb_serial_port *port, struct file *filp);
static int  edge_write			(struct usb_serial_port *port, const unsigned char *buf, int count);
static int  edge_write_room		(struct usb_serial_port *port);
static int  edge_chars_in_buffer	(struct usb_serial_port *port);
static void edge_throttle		(struct usb_serial_port *port);
static void edge_unthrottle		(struct usb_serial_port *port);
static void edge_set_termios		(struct usb_serial_port *port, struct termios *old_termios);
static int  edge_ioctl			(struct usb_serial_port *port, struct file *file, unsigned int cmd, unsigned long arg);
static void edge_break			(struct usb_serial_port *port, int break_state);
static int  edge_tiocmget		(struct usb_serial_port *port, struct file *file);
static int  edge_tiocmset		(struct usb_serial_port *port, struct file *file, unsigned int set, unsigned int clear);
static int  edge_startup		(struct usb_serial *serial);
static void edge_shutdown		(struct usb_serial *serial);


#include "io_tables.h"	/* all of the devices that this driver supports */

static struct usb_driver io_driver = {
	.owner =	THIS_MODULE,
	.name =		"io_edgeport",
	.probe =	usb_serial_probe,
	.disconnect =	usb_serial_disconnect,
	.id_table =	id_table_combined,
};

/* function prototypes for all of our local functions */
static void  process_rcvd_data		(struct edgeport_serial *edge_serial, unsigned char *buffer, __u16 bufferLength);
static void process_rcvd_status		(struct edgeport_serial *edge_serial, __u8 byte2, __u8 byte3);
static void edge_tty_recv			(struct device *dev, struct tty_struct *tty, unsigned char *data, int length);
static void handle_new_msr		(struct edgeport_port *edge_port, __u8 newMsr);
static void handle_new_lsr		(struct edgeport_port *edge_port, __u8 lsrData, __u8 lsr, __u8 data);
static int  send_iosp_ext_cmd		(struct edgeport_port *edge_port, __u8 command, __u8 param);
static int  calc_baud_rate_divisor	(int baud_rate, int *divisor);
static int  send_cmd_write_baud_rate	(struct edgeport_port *edge_port, int baudRate);
static void change_port_settings	(struct edgeport_port *edge_port, struct termios *old_termios);
static int  send_cmd_write_uart_register	(struct edgeport_port *edge_port, __u8 regNum, __u8 regValue);
static int  write_cmd_usb		(struct edgeport_port *edge_port, unsigned char *buffer, int writeLength);
static void send_more_port_data		(struct edgeport_serial *edge_serial, struct edgeport_port *edge_port);

static int  sram_write			(struct usb_serial *serial, __u16 extAddr, __u16 addr, __u16 length, __u8 *data);
static int  rom_read			(struct usb_serial *serial, __u16 extAddr, __u16 addr, __u16 length, __u8 *data);
static int  rom_write			(struct usb_serial *serial, __u16 extAddr, __u16 addr, __u16 length, __u8 *data);
static void get_manufacturing_desc	(struct edgeport_serial *edge_serial);
static void get_boot_desc		(struct edgeport_serial *edge_serial);
static void load_application_firmware	(struct edgeport_serial *edge_serial);

static void unicode_to_ascii		(char *string, __le16 *unicode, int unicode_size);


// ************************************************************************
// ************************************************************************
// ************************************************************************
// ************************************************************************

/************************************************************************
 *									*
 * update_edgeport_E2PROM()	Compare current versions of		*
 *				Boot ROM and Manufacture 		*
 *				Descriptors with versions		*
 *				embedded in this driver			*
 *									*
 ************************************************************************/
static void update_edgeport_E2PROM (struct edgeport_serial *edge_serial)
{
	__u32 BootCurVer;
	__u32 BootNewVer;
	__u8 BootMajorVersion;                  
	__u8 BootMinorVersion;                  
	__le16 BootBuildNumber;
	__u8 *BootImage;      
	__u32 BootSize;
	struct edge_firmware_image_record *record;
	unsigned char *firmware;
	int response;


	switch (edge_serial->product_info.iDownloadFile) {
		case EDGE_DOWNLOAD_FILE_I930:
			BootMajorVersion	= BootCodeImageVersion_GEN1.MajorVersion;
			BootMinorVersion	= BootCodeImageVersion_GEN1.MinorVersion;
			BootBuildNumber		= cpu_to_le16(BootCodeImageVersion_GEN1.BuildNumber);
			BootImage		= &BootCodeImage_GEN1[0];
			BootSize		= sizeof( BootCodeImage_GEN1 );
			break;

		case EDGE_DOWNLOAD_FILE_80251:
			BootMajorVersion	= BootCodeImageVersion_GEN2.MajorVersion;
			BootMinorVersion	= BootCodeImageVersion_GEN2.MinorVersion;
			BootBuildNumber		= cpu_to_le16(BootCodeImageVersion_GEN2.BuildNumber);
			BootImage		= &BootCodeImage_GEN2[0];
			BootSize		= sizeof( BootCodeImage_GEN2 );
			break;

		default:
			return;
	}

	// Check Boot Image Version
	BootCurVer = (edge_serial->boot_descriptor.MajorVersion << 24) +
		     (edge_serial->boot_descriptor.MinorVersion << 16) +
		      le16_to_cpu(edge_serial->boot_descriptor.BuildNumber);

	BootNewVer = (BootMajorVersion << 24) +
		     (BootMinorVersion << 16) +
		      le16_to_cpu(BootBuildNumber);

	dbg("Current Boot Image version %d.%d.%d",
	    edge_serial->boot_descriptor.MajorVersion,
	    edge_serial->boot_descriptor.MinorVersion,
	    le16_to_cpu(edge_serial->boot_descriptor.BuildNumber));


	if (BootNewVer > BootCurVer) {
		dbg("**Update Boot Image from %d.%d.%d to %d.%d.%d",
		    edge_serial->boot_descriptor.MajorVersion,
		    edge_serial->boot_descriptor.MinorVersion,
		    le16_to_cpu(edge_serial->boot_descriptor.BuildNumber),
		    BootMajorVersion,
		    BootMinorVersion,
		    le16_to_cpu(BootBuildNumber));


		dbg("Downloading new Boot Image");

		firmware = BootImage;

		for (;;) {
			record = (struct edge_firmware_image_record *)firmware;
			response = rom_write (edge_serial->serial, le16_to_cpu(record->ExtAddr), le16_to_cpu(record->Addr), le16_to_cpu(record->Len), &record->Data[0]);
			if (response < 0) {
				dev_err(&edge_serial->serial->dev->dev, "rom_write failed (%x, %x, %d)\n", le16_to_cpu(record->ExtAddr), le16_to_cpu(record->Addr), le16_to_cpu(record->Len));
				break;
			}
			firmware += sizeof (struct edge_firmware_image_record) + le16_to_cpu(record->Len);
			if (firmware >= &BootImage[BootSize]) {
				break;
			}
		}
	} else {
		dbg("Boot Image -- already up to date");
	}
}


/************************************************************************
 *									*
 *  Get string descriptor from device					*
 *									*
 ************************************************************************/
static int get_string (struct usb_device *dev, int Id, char *string)
{
	struct usb_string_descriptor StringDesc;
	struct usb_string_descriptor *pStringDesc;

	dbg("%s - USB String ID = %d", __FUNCTION__, Id );

	if (!usb_get_descriptor(dev, USB_DT_STRING, Id, &StringDesc, sizeof(StringDesc))) {
		return 0;
	}

	pStringDesc = kmalloc (StringDesc.bLength, GFP_KERNEL);

	if (!pStringDesc) {
		return 0;
	}

	if (!usb_get_descriptor(dev, USB_DT_STRING, Id, pStringDesc, StringDesc.bLength )) {
		kfree(pStringDesc);
		return 0;
	}

	unicode_to_ascii(string,  pStringDesc->wData,     pStringDesc->bLength/2-1);

	kfree(pStringDesc);
	return strlen(string);
}


#if 0
/************************************************************************
 *
 *  Get string descriptor from device
 *
 ************************************************************************/
static int get_string_desc (struct usb_device *dev, int Id, struct usb_string_descriptor **pRetDesc)
{
	struct usb_string_descriptor StringDesc;
	struct usb_string_descriptor *pStringDesc;

	dbg("%s - USB String ID = %d", __FUNCTION__, Id );

	if (!usb_get_descriptor(dev, USB_DT_STRING, Id, &StringDesc, sizeof(StringDesc))) {
		return 0;
	}

	pStringDesc = kmalloc (StringDesc.bLength, GFP_KERNEL);

	if (!pStringDesc) {
		return -1;
	}

	if (!usb_get_descriptor(dev, USB_DT_STRING, Id, pStringDesc, StringDesc.bLength )) {
		kfree(pStringDesc);
		return -1;
	}

	*pRetDesc = pStringDesc;
	return 0;
}
#endif

static void get_product_info(struct edgeport_serial *edge_serial)
{
	struct edgeport_product_info *product_info = &edge_serial->product_info;

	memset (product_info, 0, sizeof(struct edgeport_product_info));

	product_info->ProductId		= (__u16)(le16_to_cpu(edge_serial->serial->dev->descriptor.idProduct) & ~ION_DEVICE_ID_80251_NETCHIP);
	product_info->NumPorts		= edge_serial->manuf_descriptor.NumPorts;
	product_info->ProdInfoVer	= 0;

	product_info->RomSize		= edge_serial->manuf_descriptor.RomSize;
	product_info->RamSize		= edge_serial->manuf_descriptor.RamSize;
	product_info->CpuRev		= edge_serial->manuf_descriptor.CpuRev;
	product_info->BoardRev		= edge_serial->manuf_descriptor.BoardRev;

	product_info->BootMajorVersion	= edge_serial->boot_descriptor.MajorVersion;
	product_info->BootMinorVersion	= edge_serial->boot_descriptor.MinorVersion;
	product_info->BootBuildNumber	= edge_serial->boot_descriptor.BuildNumber;

	memcpy(product_info->ManufactureDescDate, edge_serial->manuf_descriptor.DescDate, sizeof(edge_serial->manuf_descriptor.DescDate));

	// check if this is 2nd generation hardware
	if (le16_to_cpu(edge_serial->serial->dev->descriptor.idProduct) & ION_DEVICE_ID_80251_NETCHIP) {
		product_info->FirmwareMajorVersion	= OperationalCodeImageVersion_GEN2.MajorVersion;
		product_info->FirmwareMinorVersion	= OperationalCodeImageVersion_GEN2.MinorVersion;
		product_info->FirmwareBuildNumber	= cpu_to_le16(OperationalCodeImageVersion_GEN2.BuildNumber);
		product_info->iDownloadFile		= EDGE_DOWNLOAD_FILE_80251;
	} else {
		product_info->FirmwareMajorVersion	= OperationalCodeImageVersion_GEN1.MajorVersion;
		product_info->FirmwareMinorVersion	= OperationalCodeImageVersion_GEN1.MinorVersion;
		product_info->FirmwareBuildNumber	= cpu_to_le16(OperationalCodeImageVersion_GEN1.BuildNumber);
		product_info->iDownloadFile		= EDGE_DOWNLOAD_FILE_I930;
	}

	// Determine Product type and set appropriate flags
	switch (DEVICE_ID_FROM_USB_PRODUCT_ID(product_info->ProductId)) {
		case ION_DEVICE_ID_EDGEPORT_COMPATIBLE:
		case ION_DEVICE_ID_EDGEPORT_4T:
		case ION_DEVICE_ID_EDGEPORT_4:
		case ION_DEVICE_ID_EDGEPORT_2:
		case ION_DEVICE_ID_EDGEPORT_8_DUAL_CPU:
		case ION_DEVICE_ID_EDGEPORT_8:
		case ION_DEVICE_ID_EDGEPORT_421:
		case ION_DEVICE_ID_EDGEPORT_21:
		case ION_DEVICE_ID_EDGEPORT_2_DIN:
		case ION_DEVICE_ID_EDGEPORT_4_DIN:
		case ION_DEVICE_ID_EDGEPORT_16_DUAL_CPU:
			product_info->IsRS232 = 1;
			break;

		case ION_DEVICE_ID_EDGEPORT_2I:				   // Edgeport/2 RS422/RS485
			product_info->IsRS422 = 1;
			product_info->IsRS485 = 1;
			break;

		case ION_DEVICE_ID_EDGEPORT_8I:				   // Edgeport/4 RS422
		case ION_DEVICE_ID_EDGEPORT_4I:				   // Edgeport/4 RS422
			product_info->IsRS422 = 1;
			break;
	}

	// Dump Product Info structure
	dbg("**Product Information:");
	dbg("  ProductId             %x", product_info->ProductId );
	dbg("  NumPorts              %d", product_info->NumPorts );
	dbg("  ProdInfoVer           %d", product_info->ProdInfoVer );
	dbg("  IsServer              %d", product_info->IsServer);
	dbg("  IsRS232               %d", product_info->IsRS232 );
	dbg("  IsRS422               %d", product_info->IsRS422 );
	dbg("  IsRS485               %d", product_info->IsRS485 );
	dbg("  RomSize               %d", product_info->RomSize );
	dbg("  RamSize               %d", product_info->RamSize );
	dbg("  CpuRev                %x", product_info->CpuRev  );
	dbg("  BoardRev              %x", product_info->BoardRev);
	dbg("  BootMajorVersion      %d.%d.%d", product_info->BootMajorVersion,
	    product_info->BootMinorVersion,
	    le16_to_cpu(product_info->BootBuildNumber));
	dbg("  FirmwareMajorVersion  %d.%d.%d", product_info->FirmwareMajorVersion,
	    product_info->FirmwareMinorVersion,
	    le16_to_cpu(product_info->FirmwareBuildNumber));
	dbg("  ManufactureDescDate   %d/%d/%d", product_info->ManufactureDescDate[0],
	    product_info->ManufactureDescDate[1],
	    product_info->ManufactureDescDate[2]+1900);
	dbg("  iDownloadFile         0x%x",     product_info->iDownloadFile);

}


/************************************************************************/
/************************************************************************/
/*            U S B  C A L L B A C K   F U N C T I O N S                */
/*            U S B  C A L L B A C K   F U N C T I O N S                */
/************************************************************************/
/************************************************************************/

/*****************************************************************************
 * edge_interrupt_callback
 *	this is the callback function for when we have received data on the 
 *	interrupt endpoint.
 *****************************************************************************/
static void edge_interrupt_callback (struct urb *urb, struct pt_regs *regs)
{
	struct edgeport_serial	*edge_serial = (struct edgeport_serial *)urb->context;
	struct edgeport_port *edge_port;
	struct usb_serial_port *port;
	unsigned char *data = urb->transfer_buffer;
	int length = urb->actual_length;
	int bytes_avail;
	int position;
	int txCredits;
	int portNumber;
	int result;

	dbg("%s", __FUNCTION__);

	switch (urb->status) {
	case 0:
		/* success */
		break;
	case -ECONNRESET:
	case -ENOENT:
	case -ESHUTDOWN:
		/* this urb is terminated, clean up */
		dbg("%s - urb shutting down with status: %d", __FUNCTION__, urb->status);
		return;
	default:
		dbg("%s - nonzero urb status received: %d", __FUNCTION__, urb->status);
		goto exit;
	}

	// process this interrupt-read even if there are no ports open
	if (length) {
		usb_serial_debug_data(debug, &edge_serial->serial->dev->dev, __FUNCTION__, length, data);

		if (length > 1) {
			bytes_avail = data[0] | (data[1] << 8);
			if (bytes_avail) {
				spin_lock(&edge_serial->es_lock);
				edge_serial->rxBytesAvail += bytes_avail;
				dbg("%s - bytes_avail=%d, rxBytesAvail=%d, read_in_progress=%d", __FUNCTION__, bytes_avail, edge_serial->rxBytesAvail, edge_serial->read_in_progress);

				if (edge_serial->rxBytesAvail > 0 &&
				    !edge_serial->read_in_progress) {
					dbg("%s - posting a read", __FUNCTION__);
					edge_serial->read_in_progress = TRUE;

					/* we have pending bytes on the bulk in pipe, send a request */
					edge_serial->read_urb->dev = edge_serial->serial->dev;
					result = usb_submit_urb(edge_serial->read_urb, GFP_ATOMIC);
					if (result) {
						dev_err(&edge_serial->serial->dev->dev, "%s - usb_submit_urb(read bulk) failed with result = %d\n", __FUNCTION__, result);
						edge_serial->read_in_progress = FALSE;
					}
				}
				spin_unlock(&edge_serial->es_lock);
			}
		}
		/* grab the txcredits for the ports if available */
		position = 2;
		portNumber = 0;
		while ((position < length) && (portNumber < edge_serial->serial->num_ports)) {
			txCredits = data[position] | (data[position+1] << 8);
			if (txCredits) {
				port = edge_serial->serial->port[portNumber];
				edge_port = usb_get_serial_port_data(port);
				if (edge_port->open) {
					spin_lock(&edge_port->ep_lock);
					edge_port->txCredits += txCredits;
					spin_unlock(&edge_port->ep_lock);
					dbg("%s - txcredits for port%d = %d", __FUNCTION__, portNumber, edge_port->txCredits);

					/* tell the tty driver that something has changed */
					if (edge_port->port->tty)
						tty_wakeup(edge_port->port->tty);

					// Since we have more credit, check if more data can be sent
					send_more_port_data(edge_serial, edge_port);
				}
			}
			position += 2;
			++portNumber;
		}
	}

exit:
	result = usb_submit_urb (urb, GFP_ATOMIC);
	if (result) {
		dev_err(&urb->dev->dev, "%s - Error %d submitting control urb\n", __FUNCTION__, result);
	}
}


/*****************************************************************************
 * edge_bulk_in_callback
 *	this is the callback function for when we have received data on the 
 *	bulk in endpoint.
 *****************************************************************************/
static void edge_bulk_in_callback (struct urb *urb, struct pt_regs *regs)
{
	struct edgeport_serial	*edge_serial = (struct edgeport_serial *)urb->context;
	unsigned char		*data = urb->transfer_buffer;
	int			status;
	__u16			raw_data_length;

	dbg("%s", __FUNCTION__);

	if (urb->status) {
		dbg("%s - nonzero read bulk status received: %d", __FUNCTION__, urb->status);
		edge_serial->read_in_progress = FALSE;
		return;
	}

	if (urb->actual_length == 0) {
		dbg("%s - read bulk callback with no data", __FUNCTION__);
		edge_serial->read_in_progress = FALSE;
		return;
	}

	raw_data_length = urb->actual_length;

	usb_serial_debug_data(debug, &edge_serial->serial->dev->dev, __FUNCTION__, raw_data_length, data);

	spin_lock(&edge_serial->es_lock);

	/* decrement our rxBytes available by the number that we just got */
	edge_serial->rxBytesAvail -= raw_data_length;

	dbg("%s - Received = %d, rxBytesAvail %d", __FUNCTION__, raw_data_length, edge_serial->rxBytesAvail);

	process_rcvd_data (edge_serial, data, urb->actual_length);

	/* check to see if there's any more data for us to read */
	if (edge_serial->rxBytesAvail > 0) {
		dbg("%s - posting a read", __FUNCTION__);
		edge_serial->read_urb->dev = edge_serial->serial->dev;
		status = usb_submit_urb(edge_serial->read_urb, GFP_ATOMIC);
		if (status) {
			dev_err(&urb->dev->dev, "%s - usb_submit_urb(read bulk) failed, status = %d\n", __FUNCTION__, status);
			edge_serial->read_in_progress = FALSE;
		}
	} else {
		edge_serial->read_in_progress = FALSE;
	}

	spin_unlock(&edge_serial->es_lock);
}


/*****************************************************************************
 * edge_bulk_out_data_callback
 *	this is the callback function for when we have finished sending serial data
 *	on the bulk out endpoint.
 *****************************************************************************/
static void edge_bulk_out_data_callback (struct urb *urb, struct pt_regs *regs)
{
	struct edgeport_port *edge_port = (struct edgeport_port *)urb->context;
	struct tty_struct *tty;

	dbg("%s", __FUNCTION__);

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

	tty = edge_port->port->tty;

	if (tty && edge_port->open) {
		/* let the tty driver wakeup if it has a special write_wakeup function */
		tty_wakeup(tty);
	}

	// Release the Write URB
	edge_port->write_in_progress = FALSE;

	// Check if more data needs to be sent
	send_more_port_data((struct edgeport_serial *)(usb_get_serial_data(edge_port->port->serial)), edge_port);
}


/*****************************************************************************
 * BulkOutCmdCallback
 *	this is the callback function for when we have finished sending a command
 *	on the bulk out endpoint.
 *****************************************************************************/
static void edge_bulk_out_cmd_callback (struct urb *urb, struct pt_regs *regs)
{
	struct edgeport_port *edge_port = (struct edgeport_port *)urb->context;
	struct tty_struct *tty;
	int status = urb->status;

	dbg("%s", __FUNCTION__);

	CmdUrbs--;
	dbg("%s - FREE URB %p (outstanding %d)", __FUNCTION__, urb, CmdUrbs);


	/* clean up the transfer buffer */
	if (urb->transfer_buffer != NULL) {
		kfree(urb->transfer_buffer);
	}

	/* Free the command urb */
	usb_free_urb (urb);

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

	/* Get pointer to tty */
	tty = edge_port->port->tty;

	/* tell the tty driver that something has changed */
	if (tty && edge_port->open)
		tty_wakeup(tty);

	/* we have completed the command */
	edge_port->commandPending = FALSE;
	wake_up_interruptible(&edge_port->wait_command);
}


/*****************************************************************************
 * Driver tty interface functions
 *****************************************************************************/

/*****************************************************************************
 * SerialOpen
 *	this function is called by the tty driver when a port is opened
 *	If successful, we return 0
 *	Otherwise we return a negative error number.
 *****************************************************************************/
static int edge_open (struct usb_serial_port *port, struct file * filp)
{
	struct edgeport_port *edge_port = usb_get_serial_port_data(port);
	struct usb_serial *serial;
	struct edgeport_serial *edge_serial;
	int response;
	int timeout;

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

	if (edge_port == NULL)
		return -ENODEV;

	if (port->tty)
		port->tty->low_latency = low_latency;

	/* see if we've set up our endpoint info yet (can't set it up in edge_startup
	   as the structures were not set up at that time.) */
	serial = port->serial;
	edge_serial = usb_get_serial_data(serial);
	if (edge_serial == NULL) {
		return -ENODEV;
	}
	if (edge_serial->interrupt_in_buffer == NULL) {
		struct usb_serial_port *port0 = serial->port[0];
		
		/* not set up yet, so do it now */
		edge_serial->interrupt_in_buffer = port0->interrupt_in_buffer;
		edge_serial->interrupt_in_endpoint = port0->interrupt_in_endpointAddress;
		edge_serial->interrupt_read_urb = port0->interrupt_in_urb;
		edge_serial->bulk_in_buffer = port0->bulk_in_buffer;
		edge_serial->bulk_in_endpoint = port0->bulk_in_endpointAddress;
		edge_serial->read_urb = port0->read_urb;
		edge_serial->bulk_out_endpoint = port0->bulk_out_endpointAddress;
	
		/* set up our interrupt urb */
		usb_fill_int_urb(edge_serial->interrupt_read_urb,
				 serial->dev,
				 usb_rcvintpipe(serial->dev,
					        port0->interrupt_in_endpointAddress),
				 port0->interrupt_in_buffer,
				 edge_serial->interrupt_read_urb->transfer_buffer_length,
				 edge_interrupt_callback, edge_serial,
				 edge_serial->interrupt_read_urb->interval);
		
		/* set up our bulk in urb */
		usb_fill_bulk_urb(edge_serial->read_urb, serial->dev,
				  usb_rcvbulkpipe(serial->dev,
					  	  port0->bulk_in_endpointAddress),
				  port0->bulk_in_buffer,
				  edge_serial->read_urb->transfer_buffer_length,
				  edge_bulk_in_callback, edge_serial);
		edge_serial->read_in_progress = FALSE;

		/* start interrupt read for this edgeport
		 * this interrupt will continue as long as the edgeport is connected */
		response = usb_submit_urb (edge_serial->interrupt_read_urb, GFP_KERNEL);
		if (response) {
			dev_err(&port->dev, "%s - Error %d submitting control urb\n", __FUNCTION__, response);
		}
	}
	
	/* initialize our wait queues */
	init_waitqueue_head(&edge_port->wait_open);
	init_waitqueue_head(&edge_port->wait_chase);
	init_waitqueue_head(&edge_port->delta_msr_wait);
	init_waitqueue_head(&edge_port->wait_command);

	/* initialize our icount structure */
	memset (&(edge_port->icount), 0x00, sizeof(edge_port->icount));

	/* initialize our port settings */
	edge_port->txCredits            = 0;			/* Can't send any data yet */
	edge_port->shadowMCR            = MCR_MASTER_IE;	/* Must always set this bit to enable ints! */
	edge_port->chaseResponsePending = FALSE;

	/* send a open port command */
	edge_port->openPending = TRUE;
	edge_port->open        = FALSE;
	response = send_iosp_ext_cmd (edge_port, IOSP_CMD_OPEN_PORT, 0);

	if (response < 0) {
		dev_err(&port->dev, "%s - error sending open port command\n", __FUNCTION__);
		edge_port->openPending = FALSE;
		return -ENODEV;
	}

	/* now wait for the port to be completely opened */
	timeout = OPEN_TIMEOUT;
	while (timeout && edge_port->openPending == TRUE) {
		timeout = interruptible_sleep_on_timeout (&edge_port->wait_open, timeout);
	}

	if (edge_port->open == FALSE) {
		/* open timed out */
		dbg("%s - open timedout", __FUNCTION__);
		edge_port->openPending = FALSE;
		return -ENODEV;
	}

	/* create the txfifo */
	edge_port->txfifo.head	= 0;
	edge_port->txfifo.tail	= 0;
	edge_port->txfifo.count	= 0;
	edge_port->txfifo.size	= edge_port->maxTxCredits;
	edge_port->txfifo.fifo	= kmalloc (edge_port->maxTxCredits, GFP_KERNEL);

	if (!edge_port->txfifo.fifo) {
		dbg("%s - no memory", __FUNCTION__);
		edge_close (port, filp);
		return -ENOMEM;
	}

	/* Allocate a URB for the write */
	edge_port->write_urb = usb_alloc_urb (0, GFP_KERNEL);
	edge_port->write_in_progress = FALSE;

	if (!edge_port->write_urb) {
		dbg("%s - no memory", __FUNCTION__);
		edge_close (port, filp);
		return -ENOMEM;
	}

	dbg("%s(%d) - Initialize TX fifo to %d bytes", __FUNCTION__, port->number, edge_port->maxTxCredits);

	dbg("%s exited", __FUNCTION__);

	return 0;
}


/************************************************************************
 *
 * block_until_chase_response
 *
 *	This function will block the close until one of the following:
 *		1. Response to our Chase comes from Edgeport
 *		2. A timout of 10 seconds without activity has expired
 *		   (1K of Edgeport data @ 2400 baud ==> 4 sec to empty)
 *
 ************************************************************************/
static void block_until_chase_response(struct edgeport_port *edge_port)
{
	__u16 lastCredits;
	int timeout = 1*HZ;
	int wait = 10;

	while (1) {
		// Save Last credits
		lastCredits = edge_port->txCredits;

		// Did we get our Chase response
		if (edge_port->chaseResponsePending == FALSE) {
			dbg("%s - Got Chase Response", __FUNCTION__);

			// did we get all of our credit back?
			if (edge_port->txCredits == edge_port->maxTxCredits ) {
				dbg("%s - Got all credits", __FUNCTION__);
				return;
			}
		}

		// Block the thread for a while
		interruptible_sleep_on_timeout (&edge_port->wait_chase, timeout);

		if (lastCredits == edge_port->txCredits) {
			// No activity.. count down.
			wait--;
			if (wait == 0) {
				edge_port->chaseResponsePending = FALSE;
				dbg("%s - Chase TIMEOUT", __FUNCTION__);
				return;
			}
		} else {
			// Reset timout value back to 10 seconds
			dbg("%s - Last %d, Current %d", __FUNCTION__, lastCredits, edge_port->txCredits);
			wait = 10;
		}
	}
}


/************************************************************************
 *
 * block_until_tx_empty
 *
 *	This function will block the close until one of the following:
 *		1. TX count are 0
 *		2. The edgeport has stopped
 *		3. A timout of 3 seconds without activity has expired
 *
 ************************************************************************/
static void block_until_tx_empty (struct edgeport_port *edge_port)
{
	struct TxFifo *fifo = &edge_port->txfifo;
	__u32 lastCount;
	int timeout = HZ/10;
	int wait = 30;

	while (1) {
		// Save Last count
		lastCount = fifo->count;

		// Is the Edgeport Buffer empty?
		if (lastCount == 0) {
			dbg("%s - TX Buffer Empty", __FUNCTION__);
			return;
		}

		// Block the thread for a while
		interruptible_sleep_on_timeout (&edge_port->wait_chase, timeout);

		dbg("%s wait", __FUNCTION__);

		if (lastCount == fifo->count) {
			// No activity.. count down.
			wait--;
			if (wait == 0) {
				dbg("%s - TIMEOUT", __FUNCTION__);
				return;
			}
		} else {
			// Reset timout value back to seconds
			wait = 30;
		}
	}
}


/*****************************************************************************
 * edge_close
 *	this function is called by the tty driver when a port is closed
 *****************************************************************************/
static void edge_close (struct usb_serial_port *port, struct file * filp)
{
	struct edgeport_serial *edge_serial;
	struct edgeport_port *edge_port;
	int status;

	dbg("%s - port %d", __FUNCTION__, port->number);
			 
	edge_serial = usb_get_serial_data(port->serial);
	edge_port = usb_get_serial_port_data(port);
	if ((edge_serial == NULL) || (edge_port == NULL))
		return;
	
	// block until tx is empty
	block_until_tx_empty(edge_port);

	edge_port->closePending = TRUE;

	/* flush and chase */
	edge_port->chaseResponsePending = TRUE;

	dbg("%s - Sending IOSP_CMD_CHASE_PORT", __FUNCTION__);
	status = send_iosp_ext_cmd (edge_port, IOSP_CMD_CHASE_PORT, 0);
	if (status == 0) {
		// block until chase finished
		block_until_chase_response(edge_port);
	} else {
		edge_port->chaseResponsePending = FALSE;
	}

	/* close the port */
	dbg("%s - Sending IOSP_CMD_CLOSE_PORT", __FUNCTION__);
	send_iosp_ext_cmd (edge_port, IOSP_CMD_CLOSE_PORT, 0);

	//port->close = TRUE;
	edge_port->closePending = FALSE;
	edge_port->open = FALSE;
	edge_port->openPending = FALSE;

	if (edge_port->write_urb) {
		usb_kill_urb(edge_port->write_urb);
	}

	if (edge_port->write_urb) {
		/* if this urb had a transfer buffer already (old transfer) free it */
		if (edge_port->write_urb->transfer_buffer != NULL) {
			kfree(edge_port->write_urb->transfer_buffer);
		}
		usb_free_urb   (edge_port->write_urb);
		edge_port->write_urb = NULL;
	}
	if (edge_port->txfifo.fifo) {
		kfree(edge_port->txfifo.fifo);
		edge_port->txfifo.fifo = NULL;
	}

	dbg("%s exited", __FUNCTION__);
}   

/*****************************************************************************
 * SerialWrite
 *	this function is called by the tty driver when data should be written to
 *	the port.
 *	If successful, we return the number of bytes written, otherwise we return
 *	a negative error number.
 *****************************************************************************/
static int edge_write (struct usb_serial_port *port, const unsigned char *data, int count)
{
	struct edgeport_port *edge_port = usb_get_serial_port_data(port);
	struct TxFifo *fifo;
	int copySize;
	int bytesleft;
	int firsthalf;
	int secondhalf;
	unsigned long flags;

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

	if (edge_port == NULL)
		return -ENODEV;

	// get a pointer to the Tx fifo
	fifo = &edge_port->txfifo;

	spin_lock_irqsave(&edge_port->ep_lock, flags);

	// calculate number of bytes to put in fifo
	copySize = min ((unsigned int)count, (edge_port->txCredits - fifo->count));

	dbg("%s(%d) of %d byte(s) Fifo room  %d -- will copy %d bytes", __FUNCTION__, 
	    port->number, count, edge_port->txCredits - fifo->count, copySize);

	/* catch writes of 0 bytes which the tty driver likes to give us, and when txCredits is empty */
	if (copySize == 0) {
		dbg("%s - copySize = Zero", __FUNCTION__);
		goto finish_write;
	}

	// queue the data	
	// since we can never overflow the buffer we do not have to check for full condition

	// the copy is done is two parts -- first fill to the end of the buffer
	// then copy the reset from the start of the buffer 

	bytesleft = fifo->size - fifo->head;
	firsthalf = min (bytesleft, copySize);
	dbg("%s - copy %d bytes of %d into fifo ", __FUNCTION__, firsthalf, bytesleft);

	/* now copy our data */
	memcpy(&fifo->fifo[fifo->head], data, firsthalf);
	usb_serial_debug_data(debug, &port->dev, __FUNCTION__, firsthalf, &fifo->fifo[fifo->head]);

	// update the index and size
	fifo->head  += firsthalf;
	fifo->count += firsthalf;

	// wrap the index
	if (fifo->head == fifo->size) {
		fifo->head = 0;
	}

	secondhalf = copySize-firsthalf;

	if (secondhalf) {
		dbg("%s - copy rest of data %d", __FUNCTION__, secondhalf);
		memcpy(&fifo->fifo[fifo->head], &data[firsthalf], secondhalf);
		usb_serial_debug_data(debug, &port->dev, __FUNCTION__, secondhalf, &fifo->fifo[fifo->head]);
		// update the index and size
		fifo->count += secondhalf;
		fifo->head  += secondhalf;
		// No need to check for wrap since we can not get to end of fifo in this part
	}

finish_write:
	spin_unlock_irqrestore(&edge_port->ep_lock, flags);

	send_more_port_data((struct edgeport_serial *)usb_get_serial_data(port->serial), edge_port);

	dbg("%s wrote %d byte(s) TxCredits %d, Fifo %d", __FUNCTION__, copySize, edge_port->txCredits, fifo->count);

	return copySize;   
}


/************************************************************************
 *
 * send_more_port_data()
 *
 *	This routine attempts to write additional UART transmit data
 *	to a port over the USB bulk pipe. It is called (1) when new
 *	data has been written to a port's TxBuffer from higher layers
 *	(2) when the peripheral sends us additional TxCredits indicating
 *	that it can accept more	Tx data for a given port; and (3) when
 *	a bulk write completes successfully and we want to see if we
 *	can transmit more.
 *
 ************************************************************************/
static void send_more_port_data(struct edgeport_serial *edge_serial, struct edgeport_port *edge_port)
{
	struct TxFifo	*fifo = &edge_port->txfifo;
	struct urb	*urb;
	unsigned char	*buffer;
	int		status;
	int		count;
	int		bytesleft;
	int		firsthalf;
	int		secondhalf;
	unsigned long	flags;

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

	spin_lock_irqsave(&edge_port->ep_lock, flags);

	if (edge_port->write_in_progress ||
	    !edge_port->open             ||
	    (fifo->count == 0)) {
		dbg("%s(%d) EXIT - fifo %d, PendingWrite = %d", __FUNCTION__, edge_port->port->number, fifo->count, edge_port->write_in_progress);
		goto exit_send;
	}

	// since the amount of data in the fifo will always fit into the
	// edgeport buffer we do not need to check the write length

	//	Do we have enough credits for this port to make it worthwhile
	//	to bother queueing a write. If it's too small, say a few bytes,
	//	it's better to wait for more credits so we can do a larger
	//	write.
	if (edge_port->txCredits < EDGE_FW_GET_TX_CREDITS_SEND_THRESHOLD(edge_port->maxTxCredits,EDGE_FW_BULK_MAX_PACKET_SIZE)) {
		dbg("%s(%d) Not enough credit - fifo %d TxCredit %d", __FUNCTION__, edge_port->port->number, fifo->count, edge_port->txCredits );
		goto exit_send;
	}

	// lock this write
	edge_port->write_in_progress = TRUE;

	// get a pointer to the write_urb
	urb = edge_port->write_urb;

	/* if this urb had a transfer buffer already (old transfer) free it */
	if (urb->transfer_buffer != NULL) {
		kfree(urb->transfer_buffer);
		urb->transfer_buffer = NULL;
	}

	/* build the data header for the buffer and port that we are about to send out */
	count = fifo->count;
	buffer = kmalloc (count+2, GFP_ATOMIC);
	if (buffer == NULL) {
		dev_err(&edge_port->port->dev, "%s - no more kernel memory...\n", __FUNCTION__);
		edge_port->write_in_progress = FALSE;
		goto exit_send;
	}
	buffer[0] = IOSP_BUILD_DATA_HDR1 (edge_port->port->number - edge_port->port->serial->minor, count);
	buffer[1] = IOSP_BUILD_DATA_HDR2 (edge_port->port->number - edge_port->port->serial->minor, count);

	/* now copy our data */
	bytesleft =  fifo->size - fifo->tail;
	firsthalf = min (bytesleft, count);
	memcpy(&buffer[2], &fifo->fifo[fifo->tail], firsthalf);
	fifo->tail  += firsthalf;
	fifo->count -= firsthalf;
	if (fifo->tail == fifo->size) {
		fifo->tail = 0;
	}

	secondhalf = count-firsthalf;
	if (secondhalf) {
		memcpy(&buffer[2+firsthalf], &fifo->fifo[fifo->tail], secondhalf);
		fifo->tail  += secondhalf;
		fifo->count -= secondhalf;
	}

	if (count)
		usb_serial_debug_data(debug, &edge_port->port->dev, __FUNCTION__, count, &buffer[2]);

	/* fill up the urb with all of our data and submit it */
	usb_fill_bulk_urb (urb, edge_serial->serial->dev, 
		       usb_sndbulkpipe(edge_serial->serial->dev, edge_serial->bulk_out_endpoint),
		       buffer, count+2, edge_bulk_out_data_callback, edge_port);

	/* decrement the number of credits we have by the number we just sent */
	edge_port->txCredits -= count;
	edge_port->icount.tx += count;

	urb->dev = edge_serial->serial->dev;
	status = usb_submit_urb(urb, GFP_ATOMIC);
	if (status) {
		/* something went wrong */
		dev_err(&edge_port->port->dev, "%s - usb_submit_urb(write bulk) failed, status = %d, data lost\n", __FUNCTION__, status);
		edge_port->write_in_progress = FALSE;

		/* revert the credits as something bad happened. */
		edge_port->txCredits += count;
		edge_port->icount.tx -= count;
	}
	dbg("%s wrote %d byte(s) TxCredit %d, Fifo %d", __FUNCTION__, count, edge_port->txCredits, fifo->count);

exit_send:
	spin_unlock_irqrestore(&edge_port->ep_lock, flags);
}


/*****************************************************************************
 * edge_write_room
 *	this function is called by the tty driver when it wants to know how many
 *	bytes of data we can accept for a specific port.
 *	If successful, we return the amount of room that we have for this port
 *	(the txCredits), 
 *	Otherwise we return a negative error number.
 *****************************************************************************/
static int edge_write_room (struct usb_serial_port *port)
{
	struct edgeport_port *edge_port = usb_get_serial_port_data(port);
	int room;
	unsigned long flags;

	dbg("%s", __FUNCTION__);

	if (edge_port == NULL)
		return -ENODEV;
	if (edge_port->closePending == TRUE)
		return -ENODEV;

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

	if (!edge_port->open) {
		dbg("%s - port not opened", __FUNCTION__);
		return -EINVAL;
	}

	// total of both buffers is still txCredit
	spin_lock_irqsave(&edge_port->ep_lock, flags);
	room = edge_port->txCredits - edge_port->txfifo.count;
	spin_unlock_irqrestore(&edge_port->ep_lock, flags);

	dbg("%s - returns %d", __FUNCTION__, room);
	return room;
}


/*****************************************************************************
 * edge_chars_in_buffer
 *	this function is called by the tty driver when it wants to know how many
 *	bytes of data we currently have outstanding in the port (data that has
 *	been written, but hasn't made it out the port yet)
 *	If successful, we return the number of bytes left to be written in the 
 *	system, 
 *	Otherwise we return a negative error number.
 *****************************************************************************/
static int edge_chars_in_buffer (struct usb_serial_port *port)
{
	struct edgeport_port *edge_port = usb_get_serial_port_data(port);
	int num_chars;
	unsigned long flags;

	dbg("%s", __FUNCTION__);

	if (edge_port == NULL)
		return -ENODEV;
	if (edge_port->closePending == TRUE)
		return -ENODEV;

	if (!edge_port->open) {
		dbg("%s - port not opened", __FUNCTION__);
		return -EINVAL;
	}

	spin_lock_irqsave(&edge_port->ep_lock, flags);
	num_chars = edge_port->maxTxCredits - edge_port->txCredits + edge_port->txfifo.count;
	spin_unlock_irqrestore(&edge_port->ep_lock, flags);
	if (num_chars) {
		dbg("%s(port %d) - returns %d", __FUNCTION__, port->number, num_chars);
	}

	return num_chars;
}


/*****************************************************************************
 * SerialThrottle
 *	this function is called by the tty driver when it wants to stop the data
 *	being read from the port.
 *****************************************************************************/
static void edge_throttle (struct usb_serial_port *port)
{
	struct edgeport_port *edge_port = usb_get_serial_port_data(port);
	struct tty_struct *tty;
	int status;

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

	if (edge_port == NULL)
		return;

	if (!edge_port->open) {
		dbg("%s - port not opened", __FUNCTION__);
		return;
	}

	tty = port->tty;
	if (!tty) {
		dbg ("%s - no tty available", __FUNCTION__);
		return;
	}

	/* if we are implementing XON/XOFF, send the stop character */
	if (I_IXOFF(tty)) {
		unsigned char stop_char = STOP_CHAR(tty);
		status = edge_write (port, &stop_char, 1);
		if (status <= 0) {
			return;
		}
	}

	/* if we are implementing RTS/CTS, toggle that line */
	if (tty->termios->c_cflag & CRTSCTS) {
		edge_port->shadowMCR &= ~MCR_RTS;
		status = send_cmd_write_uart_register(edge_port, MCR, edge_port->shadowMCR);
		if (status != 0) {
			return;
		}
	}

	return;
}


/*****************************************************************************
 * edge_unthrottle
 *	this function is called by the tty driver when it wants to resume the data
 *	being read from the port (called after SerialThrottle is called)
 *****************************************************************************/
static void edge_unthrottle (struct usb_serial_port *port)
{
	struct edgeport_port *edge_port = usb_get_serial_port_data(port);
	struct tty_struct *tty;
	int status;

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

	if (edge_port == NULL)
		return;

	if (!edge_port->open) {
		dbg("%s - port not opened", __FUNCTION__);
		return;
	}

	tty = port->tty;
	if (!tty) {
		dbg ("%s - no tty available", __FUNCTION__);
		return;
	}

	/* if we are implementing XON/XOFF, send the start character */
	if (I_IXOFF(tty)) {
		unsigned char start_char = START_CHAR(tty);
		status = edge_write (port, &start_char, 1);
		if (status <= 0) {
			return;
		}
	}

	/* if we are implementing RTS/CTS, toggle that line */
	if (tty->termios->c_cflag & CRTSCTS) {
		edge_port->shadowMCR |= MCR_RTS;
		status = send_cmd_write_uart_register(edge_port, MCR, edge_port->shadowMCR);
		if (status != 0) {
			return;
		}
	}

	return;
}


/*****************************************************************************
 * SerialSetTermios
 *	this function is called by the tty driver when it wants to change the termios structure
 *****************************************************************************/
static void edge_set_termios (struct usb_serial_port *port, struct termios *old_termios)
{
	struct edgeport_port *edge_port = usb_get_serial_port_data(port);
	struct tty_struct *tty = port->tty;
	unsigned int cflag;

	if (!port->tty || !port->tty->termios) {
		dbg ("%s - no tty or termios", __FUNCTION__);
		return;
	}

	cflag = tty->termios->c_cflag;
	/* check that they really want us to change something */
	if (old_termios) {
		if (cflag == old_termios->c_cflag &&
		    tty->termios->c_iflag == old_termios->c_iflag) {
			dbg("%s - nothing to change", __FUNCTION__);
			return;
		}
	}

	dbg("%s - clfag %08x iflag %08x", __FUNCTION__, 
	    tty->termios->c_cflag, tty->termios->c_iflag);
	if (old_termios) {
		dbg("%s - old clfag %08x old iflag %08x", __FUNCTION__,
		    old_termios->c_cflag, old_termios->c_iflag);
	}

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

	if (edge_port == NULL)
		return;

	if (!edge_port->open) {
		dbg("%s - port not opened", __FUNCTION__);
		return;
	}

	/* change the port settings to the new ones specified */
	change_port_settings (edge_port, old_termios);

	return;
}


/*****************************************************************************
 * get_lsr_info - get line status register info
 *
 * Purpose: Let user call ioctl() to get info when the UART physically
 * 	    is emptied.  On bus types like RS485, the transmitter must
 * 	    release the bus after transmitting. This must be done when
 * 	    the transmit shift register is empty, not be done when the
 * 	    transmit holding register is empty.  This functionality
 * 	    allows an RS485 driver to be written in user space. 
 *****************************************************************************/
static int get_lsr_info(struct edgeport_port *edge_port, unsigned int __user *value)
{
	unsigned int result = 0;
	unsigned long flags;

	spin_lock_irqsave(&edge_port->ep_lock, flags);
	if (edge_port->maxTxCredits == edge_port->txCredits &&
	    edge_port->txfifo.count == 0) {
		dbg("%s -- Empty", __FUNCTION__);
		result = TIOCSER_TEMT;
	}
	spin_unlock_irqrestore(&edge_port->ep_lock, flags);

	if (copy_to_user(value, &result, sizeof(int)))
		return -EFAULT;
	return 0;
}

static int get_number_bytes_avail(struct edgeport_port *edge_port, unsigned int __user *value)
{
	unsigned int result = 0;
	struct tty_struct *tty = edge_port->port->tty;

	if (!tty)
		return -ENOIOCTLCMD;

	result = tty->read_cnt;

	dbg("%s(%d) = %d", __FUNCTION__,  edge_port->port->number, result);
	if (copy_to_user(value, &result, sizeof(int)))
		return -EFAULT;
	//return 0;
	return -ENOIOCTLCMD;
}

static int edge_tiocmset (struct usb_serial_port *port, struct file *file, unsigned int set, unsigned int clear)
{
	struct edgeport_port *edge_port = usb_get_serial_port_data(port);
	unsigned int mcr;

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

	mcr = edge_port->shadowMCR;
	if (set & TIOCM_RTS)
		mcr |= MCR_RTS;
	if (set & TIOCM_DTR)
		mcr |= MCR_DTR;
	if (set & TIOCM_LOOP)
		mcr |= MCR_LOOPBACK;

	if (clear & TIOCM_RTS)
		mcr &= ~MCR_RTS;
	if (clear & TIOCM_DTR)
		mcr &= ~MCR_DTR;
	if (clear & TIOCM_LOOP)
		mcr &= ~MCR_LOOPBACK;

	edge_port->shadowMCR = mcr;

	send_cmd_write_uart_register(edge_port, MCR, edge_port->shadowMCR);

	return 0;
}

static int edge_tiocmget(struct usb_serial_port *port, struct file *file)
{
	struct edgeport_port *edge_port = usb_get_serial_port_data(port);
	unsigned int result = 0;
	unsigned int msr;
	unsigned int mcr;

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

	msr = edge_port->shadowMSR;
	mcr = edge_port->shadowMCR;
	result = ((mcr & MCR_DTR)	? TIOCM_DTR: 0)	  /* 0x002 */
		  | ((mcr & MCR_RTS)	? TIOCM_RTS: 0)   /* 0x004 */
		  | ((msr & EDGEPORT_MSR_CTS)	? TIOCM_CTS: 0)   /* 0x020 */
		  | ((msr & EDGEPORT_MSR_CD)	? TIOCM_CAR: 0)   /* 0x040 */
		  | ((msr & EDGEPORT_MSR_RI)	? TIOCM_RI:  0)   /* 0x080 */
		  | ((msr & EDGEPORT_MSR_DSR)	? TIOCM_DSR: 0);  /* 0x100 */


	dbg("%s -- %x", __FUNCTION__, result);

	return result;
}

static int get_serial_info(struct edgeport_port *edge_port, struct serial_struct __user *retinfo)
{
	struct serial_struct tmp;

	if (!retinfo)
		return -EFAULT;

	memset(&tmp, 0, sizeof(tmp));

	tmp.type		= PORT_16550A;
	tmp.line		= edge_port->port->serial->minor;
	tmp.port		= edge_port->port->number;
	tmp.irq			= 0;
	tmp.flags		= ASYNC_SKIP_TEST | ASYNC_AUTO_IRQ;
	tmp.xmit_fifo_size	= edge_port->maxTxCredits;
	tmp.baud_base		= 9600;
	tmp.close_delay		= 5*HZ;
	tmp.closing_wait	= 30*HZ;
//	tmp.custom_divisor	= state->custom_divisor;
//	tmp.hub6		= state->hub6;
//	tmp.io_type		= state->io_type;

	if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
		return -EFAULT;
	return 0;
}


/*****************************************************************************
 * SerialIoctl
 *	this function handles any ioctl calls to the driver
 *****************************************************************************/
static int edge_ioctl (struct usb_serial_port *port, struct file *file, unsigned int cmd, unsigned long arg)
{
	struct edgeport_port *edge_port = usb_get_serial_port_data(port);
	struct async_icount cnow;
	struct async_icount cprev;
	struct serial_icounter_struct icount;


	dbg("%s - port %d, cmd = 0x%x", __FUNCTION__, port->number, cmd);

	switch (cmd) {
		// return number of bytes available
		case TIOCINQ:
			dbg("%s (%d) TIOCINQ", __FUNCTION__,  port->number);
			return get_number_bytes_avail(edge_port, (unsigned int __user *) arg);
			break;

		case TIOCSERGETLSR:
			dbg("%s (%d) TIOCSERGETLSR", __FUNCTION__,  port->number);
			return get_lsr_info(edge_port, (unsigned int __user *) arg);
			return 0;

		case TIOCGSERIAL:
			dbg("%s (%d) TIOCGSERIAL", __FUNCTION__,  port->number);
			return get_serial_info(edge_port, (struct serial_struct __user *) arg);

		case TIOCSSERIAL:
			dbg("%s (%d) TIOCSSERIAL", __FUNCTION__,  port->number);
			break;

		case TIOCMIWAIT:
			dbg("%s (%d) TIOCMIWAIT", __FUNCTION__,  port->number);
			cprev = edge_port->icount;
			while (1) {
				interruptible_sleep_on(&edge_port->delta_msr_wait);
				/* see if a signal did it */
				if (signal_pending(current))
					return -ERESTARTSYS;
				cnow = edge_port->icount;
				if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
				    cnow.dcd == cprev.dcd && cnow.cts == cprev.cts)
					return -EIO; /* no change => error */
				if (((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
				    ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
				    ((arg & TIOCM_CD)  && (cnow.dcd != cprev.dcd)) ||
				    ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts)) ) {
					return 0;
				}
				cprev = cnow;
			}
			/* NOTREACHED */
			break;

		case TIOCGICOUNT:
			cnow = edge_port->icount;
			memset(&icount, 0, sizeof(icount));
			icount.cts = cnow.cts;
			icount.dsr = cnow.dsr;
			icount.rng = cnow.rng;
			icount.dcd = cnow.dcd;
			icount.rx = cnow.rx;
			icount.tx = cnow.tx;
			icount.frame = cnow.frame;
			icount.overrun = cnow.overrun;
			icount.parity = cnow.parity;
			icount.brk = cnow.brk;
			icount.buf_overrun = cnow.buf_overrun;

			dbg("%s (%d) TIOCGICOUNT RX=%d, TX=%d", __FUNCTION__,  port->number, icount.rx, icount.tx );
			if (copy_to_user((void __user *)arg, &icount, sizeof(icount)))
				return -EFAULT;
			return 0;
	}

	return -ENOIOCTLCMD;
}


/*****************************************************************************
 * SerialBreak
 *	this function sends a break to the port
 *****************************************************************************/
static void edge_break (struct usb_serial_port *port, int break_state)
{
	struct edgeport_port *edge_port = usb_get_serial_port_data(port);
	int status;

	/* flush and chase */
	edge_port->chaseResponsePending = TRUE;

	dbg("%s - Sending IOSP_CMD_CHASE_PORT", __FUNCTION__);
	status = send_iosp_ext_cmd (edge_port, IOSP_CMD_CHASE_PORT, 0);
	if (status == 0) {
		// block until chase finished
		block_until_chase_response(edge_port);
	} else {
		edge_port->chaseResponsePending = FALSE;
	}

	if (break_state == -1) {
		dbg("%s - Sending IOSP_CMD_SET_BREAK", __FUNCTION__);
		status = send_iosp_ext_cmd (edge_port, IOSP_CMD_SET_BREAK, 0);
	} else {
		dbg("%s - Sending IOSP_CMD_CLEAR_BREAK", __FUNCTION__);
		status = send_iosp_ext_cmd (edge_port, IOSP_CMD_CLEAR_BREAK, 0);
	}
	if (status) {
		dbg("%s - error sending break set/clear command.", __FUNCTION__);
	}

	return;
}


/*****************************************************************************
 * process_rcvd_data
 *	this function handles the data received on the bulk in pipe.
 *****************************************************************************/
static void process_rcvd_data (struct edgeport_serial *edge_serial, unsigned char * buffer, __u16 bufferLength)
{
	struct usb_serial_port *port;
	struct edgeport_port *edge_port;
	struct tty_struct *tty;
	__u16 lastBufferLength;
	__u16 rxLen;

	dbg("%s", __FUNCTION__);

	lastBufferLength = bufferLength + 1;

	while (bufferLength > 0) {
		/* failsafe incase we get a message that we don't understand */
		if (lastBufferLength == bufferLength) {
			dbg("%s - stuck in loop, exiting it.", __FUNCTION__);
			break;
		}
		lastBufferLength = bufferLength;

		switch (edge_serial->rxState) {
			case EXPECT_HDR1:
				edge_serial->rxHeader1 = *buffer;
				++buffer;
				--bufferLength;

				if (bufferLength == 0) {
					edge_serial->rxState = EXPECT_HDR2;
					break;
				}
				/* otherwise, drop on through */

			case EXPECT_HDR2:
				edge_serial->rxHeader2 = *buffer;
				++buffer;
				--bufferLength;

				dbg("%s - Hdr1=%02X Hdr2=%02X", __FUNCTION__, edge_serial->rxHeader1, edge_serial->rxHeader2);

				// Process depending on whether this header is
				// data or status

				if (IS_CMD_STAT_HDR(edge_serial->rxHeader1)) {
					// Decode this status header and goto EXPECT_HDR1 (if we
					// can process the status with only 2 bytes), or goto
					// EXPECT_HDR3 to get the third byte.

					edge_serial->rxPort       = IOSP_GET_HDR_PORT(edge_serial->rxHeader1);
					edge_serial->rxStatusCode = IOSP_GET_STATUS_CODE(edge_serial->rxHeader1);

					if (!IOSP_STATUS_IS_2BYTE(edge_serial->rxStatusCode)) {
						// This status needs additional bytes. Save what we have
						// and then wait for more data.
						edge_serial->rxStatusParam = edge_serial->rxHeader2;

						edge_serial->rxState = EXPECT_HDR3;
						break;
					}

					// We have all the header bytes, process the status now
					process_rcvd_status (edge_serial, edge_serial->rxHeader2, 0);
					edge_serial->rxState = EXPECT_HDR1;
					break;
				} else {
					edge_serial->rxPort = IOSP_GET_HDR_PORT(edge_serial->rxHeader1);
					edge_serial->rxBytesRemaining = IOSP_GET_HDR_DATA_LEN(edge_serial->rxHeader1, edge_serial->rxHeader2);

					dbg("%s - Data for Port %u Len %u", __FUNCTION__, edge_serial->rxPort, edge_serial->rxBytesRemaining);

					//ASSERT( DevExt->RxPort < DevExt->NumPorts );
					//ASSERT( DevExt->RxBytesRemaining < IOSP_MAX_DATA_LENGTH );

					if (bufferLength == 0 ) {
						edge_serial->rxState = EXPECT_DATA;
						break;
					}
					// Else, drop through
				}

			case EXPECT_DATA:	// Expect data

				if (bufferLength < edge_serial->rxBytesRemaining) {
					rxLen = bufferLength;
					edge_serial->rxState = EXPECT_DATA;	// Expect data to start next buffer
				} else {
					// BufLen >= RxBytesRemaining
					rxLen = edge_serial->rxBytesRemaining;
					edge_serial->rxState = EXPECT_HDR1;	// Start another header next time
				}

				bufferLength -= rxLen;
				edge_serial->rxBytesRemaining -= rxLen;

				/* spit this data back into the tty driver if this port is open */
				if (rxLen) {
					port = edge_serial->serial->port[edge_serial->rxPort];
					edge_port = usb_get_serial_port_data(port);
					if (edge_port->open) {
						tty = edge_port->port->tty;
						if (tty) {
							dbg("%s - Sending %d bytes to TTY for port %d", __FUNCTION__, rxLen, edge_serial->rxPort);
							edge_tty_recv(&edge_serial->serial->dev->dev, tty, buffer, rxLen);
						}
						edge_port->icount.rx += rxLen;
					}
					buffer += rxLen;
				}

				break;

			case EXPECT_HDR3:			// Expect 3rd byte of status header
				edge_serial->rxHeader3 = *buffer;
				++buffer;
				--bufferLength;

				// We have all the header bytes, process the status now
				process_rcvd_status (edge_serial, edge_serial->rxStatusParam, edge_serial->rxHeader3);
				edge_serial->rxState = EXPECT_HDR1;
				break;

		}
	}
}


/*****************************************************************************
 * process_rcvd_status
 *	this function handles the any status messages received on the bulk in pipe.
 *****************************************************************************/
static void process_rcvd_status (struct edgeport_serial *edge_serial, __u8 byte2, __u8 byte3)
{
	struct usb_serial_port *port;
	struct edgeport_port *edge_port;
	__u8 code = edge_serial->rxStatusCode;

	/* switch the port pointer to the one being currently talked about */
	port = edge_serial->serial->port[edge_serial->rxPort];
	edge_port = usb_get_serial_port_data(port);
	if (edge_port == NULL) {
		dev_err(&edge_serial->serial->dev->dev, "%s - edge_port == NULL for port %d\n", __FUNCTION__, edge_serial->rxPort);
		return;
	}

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

	if (code == IOSP_EXT_STATUS) {
		switch (byte2) {
			case IOSP_EXT_STATUS_CHASE_RSP:
				// we want to do EXT status regardless of port open/closed 
				dbg("%s - Port %u EXT CHASE_RSP Data = %02x", __FUNCTION__, edge_serial->rxPort, byte3 );
				// Currently, the only EXT_STATUS is Chase, so process here instead of one more call
				// to one more subroutine. If/when more EXT_STATUS, there'll be more work to do.
				// Also, we currently clear flag and close the port regardless of content of above's Byte3.
				// We could choose to do something else when Byte3 says Timeout on Chase from Edgeport,
				// like wait longer in block_until_chase_response, but for now we don't. 
				edge_port->chaseResponsePending = FALSE;
				wake_up_interruptible (&edge_port->wait_chase);
				return;

			case IOSP_EXT_STATUS_RX_CHECK_RSP:
				dbg("%s ========== Port %u CHECK_RSP Sequence = %02x =============\n", __FUNCTION__, edge_serial->rxPort, byte3 );
				//Port->RxCheckRsp = TRUE;
				return;
		}
	}

	if (code == IOSP_STATUS_OPEN_RSP) {
		edge_port->txCredits = GET_TX_BUFFER_SIZE(byte3);
		edge_port->maxTxCredits = edge_port->txCredits;
		dbg("%s - Port %u Open Response Inital MSR = %02x TxBufferSize = %d", __FUNCTION__, edge_serial->rxPort, byte2, edge_port->txCredits);
		handle_new_msr (edge_port, byte2);

		/* send the current line settings to the port so we are in sync with any further termios calls */
		if (edge_port->port->tty)
			change_port_settings (edge_port, edge_port->port->tty->termios);

		/* we have completed the open */
		edge_port->openPending = FALSE;
		edge_port->open = TRUE;
		wake_up_interruptible(&edge_port->wait_open);
		return;
	}

	// If port is closed, silently discard all rcvd status. We can
	// have cases where buffered status is received AFTER the close
	// port command is sent to the Edgeport.
	if ((!edge_port->open ) || (edge_port->closePending)) {
		return;
	}

	switch (code) {
		// Not currently sent by Edgeport
		case IOSP_STATUS_LSR:
			dbg("%s - Port %u LSR Status = %02x", __FUNCTION__, edge_serial->rxPort, byte2);
			handle_new_lsr (edge_port, FALSE, byte2, 0);
			break;

		case IOSP_STATUS_LSR_DATA:
			dbg("%s - Port %u LSR Status = %02x, Data = %02x", __FUNCTION__, edge_serial->rxPort, byte2, byte3);
			// byte2 is LSR Register
			// byte3 is broken data byte
			handle_new_lsr (edge_port, TRUE, byte2, byte3);
			break;
			//
			//	case IOSP_EXT_4_STATUS:
			//		dbg("%s - Port %u LSR Status = %02x Data = %02x", __FUNCTION__, edge_serial->rxPort, byte2, byte3);
			//		break;
			//
		case IOSP_STATUS_MSR:
			dbg("%s - Port %u MSR Status = %02x", __FUNCTION__, edge_serial->rxPort, byte2);

			// Process this new modem status and generate appropriate
			// events, etc, based on the new status. This routine
			// also saves the MSR in Port->ShadowMsr.
			handle_new_msr(edge_port, byte2);
			break;

		default:
			dbg("%s - Unrecognized IOSP status code %u\n", __FUNCTION__, code);
			break;
	}

	return;
}


/*****************************************************************************
 * edge_tty_recv
 *	this function passes data on to the tty flip buffer
 *****************************************************************************/
static void edge_tty_recv(struct device *dev, struct tty_struct *tty, unsigned char *data, int length)
{
	int cnt;

	do {
		if (tty->flip.count >= TTY_FLIPBUF_SIZE) {
			tty_flip_buffer_push(tty);
			if (tty->flip.count >= TTY_FLIPBUF_SIZE) {
				dev_err(dev, "%s - dropping data, %d bytes lost\n",
					__FUNCTION__, length);
				return;
			}
		}
		cnt = min(length, TTY_FLIPBUF_SIZE - tty->flip.count);
		memcpy(tty->flip.char_buf_ptr, data, cnt);
		memset(tty->flip.flag_buf_ptr, 0, cnt);
		tty->flip.char_buf_ptr += cnt;
		tty->flip.flag_buf_ptr += cnt;
		tty->flip.count += cnt;
		data += cnt;
		length -= cnt;
	} while (length > 0);

	tty_flip_buffer_push(tty);
}


/*****************************************************************************
 * handle_new_msr
 *	this function handles any change to the msr register for a port.
 *****************************************************************************/
static void handle_new_msr(struct edgeport_port *edge_port, __u8 newMsr)
{
	struct  async_icount *icount;

	dbg("%s %02x", __FUNCTION__, newMsr);

	if (newMsr & (EDGEPORT_MSR_DELTA_CTS | EDGEPORT_MSR_DELTA_DSR | EDGEPORT_MSR_DELTA_RI | EDGEPORT_MSR_DELTA_CD)) {
		icount = &edge_port->icount;

		/* update input line counters */
		if (newMsr & EDGEPORT_MSR_DELTA_CTS) {
			icount->cts++;
		}
		if (newMsr & EDGEPORT_MSR_DELTA_DSR) {
			icount->dsr++;
		}
		if (newMsr & EDGEPORT_MSR_DELTA_CD) {
			icount->dcd++;
		}
		if (newMsr & EDGEPORT_MSR_DELTA_RI) {
			icount->rng++;
		}
		wake_up_interruptible(&edge_port->delta_msr_wait);
	}

	/* Save the new modem status */
	edge_port->shadowMSR = newMsr & 0xf0;

	return;
}


/*****************************************************************************
 * handle_new_lsr
 *	this function handles any change to the lsr register for a port.
 *****************************************************************************/
static void handle_new_lsr(struct edgeport_port *edge_port, __u8 lsrData, __u8 lsr, __u8 data)
{
	__u8    newLsr = (__u8)(lsr & (__u8)(LSR_OVER_ERR | LSR_PAR_ERR | LSR_FRM_ERR | LSR_BREAK));
	struct  async_icount *icount;

	dbg("%s - %02x", __FUNCTION__, newLsr);

	edge_port->shadowLSR = lsr;

	if (newLsr & LSR_BREAK) {
		//
		// Parity and Framing errors only count if they
		// occur exclusive of a break being
		// received.
		//
		newLsr &= (__u8)(LSR_OVER_ERR | LSR_BREAK);
	}

	/* Place LSR data byte into Rx buffer */
	if (lsrData && edge_port->port->tty)
		edge_tty_recv(&edge_port->port->dev, edge_port->port->tty, &data, 1);

	/* update input line counters */
	icount = &edge_port->icount;
	if (newLsr & LSR_BREAK) {
		icount->brk++;
	}
	if (newLsr & LSR_OVER_ERR) {
		icount->overrun++;
	}
	if (newLsr & LSR_PAR_ERR) {
		icount->parity++;
	}
	if (newLsr & LSR_FRM_ERR) {
		icount->frame++;
	}

	return;
}


/****************************************************************************
 * sram_write
 *	writes a number of bytes to the Edgeport device's sram starting at the 
 *	given address.
 *	If successful returns the number of bytes written, otherwise it returns
 *	a negative error number of the problem.
 ****************************************************************************/
static int sram_write (struct usb_serial *serial, __u16 extAddr, __u16 addr, __u16 length, __u8 *data)
{
	int result;
	__u16 current_length;
	unsigned char *transfer_buffer;

	dbg("%s - %x, %x, %d", __FUNCTION__, extAddr, addr, length);

	transfer_buffer =  kmalloc (64, GFP_KERNEL);
	if (!transfer_buffer) {
		dev_err(&serial->dev->dev, "%s - kmalloc(%d) failed.\n", __FUNCTION__, 64);
		return -ENOMEM;
	}

	/* need to split these writes up into 64 byte chunks */
	result = 0;
	while (length > 0) {
		if (length > 64) {
			current_length = 64;
		} else {
			current_length = length;
		}
//		dbg("%s - writing %x, %x, %d", __FUNCTION__, extAddr, addr, current_length);
		memcpy (transfer_buffer, data, current_length);
		result = usb_control_msg (serial->dev, usb_sndctrlpipe(serial->dev, 0), USB_REQUEST_ION_WRITE_RAM, 
					  0x40, addr, extAddr, transfer_buffer, current_length, 300);
		if (result < 0)
			break;
		length -= current_length;
		addr += current_length;
		data += current_length;
	}       

	kfree (transfer_buffer);
	return result;
}


/****************************************************************************
 * rom_write
 *	writes a number of bytes to the Edgeport device's ROM starting at the
 *	given address.
 *	If successful returns the number of bytes written, otherwise it returns
 *	a negative error number of the problem.
 ****************************************************************************/
static int rom_write (struct usb_serial *serial, __u16 extAddr, __u16 addr, __u16 length, __u8 *data)
{
	int result;
	__u16 current_length;
	unsigned char *transfer_buffer;

//	dbg("%s - %x, %x, %d", __FUNCTION__, extAddr, addr, length);

	transfer_buffer =  kmalloc (64, GFP_KERNEL);
	if (!transfer_buffer) {
		dev_err(&serial->dev->dev, "%s - kmalloc(%d) failed.\n", __FUNCTION__, 64);
		return -ENOMEM;
	}

	/* need to split these writes up into 64 byte chunks */
	result = 0;
	while (length > 0) {
		if (length > 64) {
			current_length = 64;
		} else {
			current_length = length;
		}
//		dbg("%s - writing %x, %x, %d", __FUNCTION__, extAddr, addr, current_length);
		memcpy (transfer_buffer, data, current_length);
		result = usb_control_msg (serial->dev, usb_sndctrlpipe(serial->dev, 0), USB_REQUEST_ION_WRITE_ROM, 
					  0x40, addr, extAddr, transfer_buffer, current_length, 300);
		if (result < 0)
			break;
		length -= current_length;
		addr += current_length;
		data += current_length;
	}       

	kfree (transfer_buffer);
	return result;
}


/****************************************************************************
 * rom_read
 *	reads a number of bytes from the Edgeport device starting at the given
 *	address.
 *	If successful returns the number of bytes read, otherwise it returns
 *	a negative error number of the problem.
 ****************************************************************************/
static int rom_read (struct usb_serial *serial, __u16 extAddr, __u16 addr, __u16 length, __u8 *data)
{
	int result;
	__u16 current_length;
	unsigned char *transfer_buffer;

	dbg("%s - %x, %x, %d", __FUNCTION__, extAddr, addr, length);

	transfer_buffer =  kmalloc (64, GFP_KERNEL);
	if (!transfer_buffer) {
		dev_err(&serial->dev->dev, "%s - kmalloc(%d) failed.\n", __FUNCTION__, 64);
		return -ENOMEM;
	}

	/* need to split these reads up into 64 byte chunks */
	result = 0;
	while (length > 0) {
		if (length > 64) {
			current_length = 64;
		} else {
			current_length = length;
		}
//		dbg("%s - %x, %x, %d", __FUNCTION__, extAddr, addr, current_length);
		result = usb_control_msg (serial->dev, usb_rcvctrlpipe(serial->dev, 0), USB_REQUEST_ION_READ_ROM, 
					  0xC0, addr, extAddr, transfer_buffer, current_length, 300);
		if (result < 0)
			break;
		memcpy (data, transfer_buffer, current_length);
		length -= current_length;
		addr += current_length;
		data += current_length;
	}       

	kfree (transfer_buffer);
	return result;
}


/****************************************************************************
 * send_iosp_ext_cmd
 *	Is used to send a IOSP message to the Edgeport device
 ****************************************************************************/
static int send_iosp_ext_cmd (struct edgeport_port *edge_port, __u8 command, __u8 param)
{
	unsigned char   *buffer;
	unsigned char   *currentCommand;
	int             length = 0;
	int             status = 0;

	dbg("%s - %d, %d", __FUNCTION__, command, param);

	buffer =  kmalloc (10, GFP_ATOMIC);
	if (!buffer) {
		dev_err(&edge_port->port->dev, "%s - kmalloc(%d) failed.\n", __FUNCTION__, 10);
		return -ENOMEM;
	}

	currentCommand = buffer;

	MAKE_CMD_EXT_CMD (&currentCommand, &length,
			  edge_port->port->number - edge_port->port->serial->minor,
			  command, param);

	status = write_cmd_usb (edge_port, buffer, length);
	if (status) {
		/* something bad happened, let's free up the memory */
		kfree(buffer);
	}

	return status;
}


/*****************************************************************************
 * write_cmd_usb
 *	this function writes the given buffer out to the bulk write endpoint.
 *****************************************************************************/
static int write_cmd_usb (struct edgeport_port *edge_port, unsigned char *buffer, int length)
{
	struct edgeport_serial *edge_serial = usb_get_serial_data(edge_port->port->serial);
	int status = 0;
	struct urb *urb;
	int timeout;

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

	/* Allocate our next urb */
	urb = usb_alloc_urb (0, GFP_ATOMIC);
	if (!urb)
		return -ENOMEM;

	CmdUrbs++;
	dbg("%s - ALLOCATE URB %p (outstanding %d)", __FUNCTION__, urb, CmdUrbs);

	usb_fill_bulk_urb (urb, edge_serial->serial->dev, 
		       usb_sndbulkpipe(edge_serial->serial->dev, edge_serial->bulk_out_endpoint),
		       buffer, length, edge_bulk_out_cmd_callback, edge_port);

	edge_port->commandPending = TRUE;
	status = usb_submit_urb(urb, GFP_ATOMIC);

	if (status) {
		/* something went wrong */
		dev_err(&edge_port->port->dev, "%s - usb_submit_urb(write command) failed, status = %d\n", __FUNCTION__, status);
		usb_kill_urb(urb);
		usb_free_urb(urb);
		CmdUrbs--;
		return status;
	}

	// wait for command to finish
	timeout = COMMAND_TIMEOUT;
#if 0
	while (timeout && edge_port->commandPending == TRUE) {
		timeout = interruptible_sleep_on_timeout (&edge_port->wait_command, timeout);
	}

	if (edge_port->commandPending == TRUE) {
		/* command timed out */
		dbg("%s - command timed out", __FUNCTION__);
		status = -EINVAL;
	}
#endif
	return status;
}


/*****************************************************************************
 * send_cmd_write_baud_rate
 *	this function sends the proper command to change the baud rate of the
 *	specified port.
 *****************************************************************************/
static int send_cmd_write_baud_rate (struct edgeport_port *edge_port, int baudRate)
{
	unsigned char *cmdBuffer;
	unsigned char *currCmd;
	int cmdLen = 0;
	int divisor;
	int status;
	unsigned char number = edge_port->port->number - edge_port->port->serial->minor;

	dbg("%s - port = %d, baud = %d", __FUNCTION__, edge_port->port->number, baudRate);

	status = calc_baud_rate_divisor (baudRate, &divisor);
	if (status) {
		dev_err(&edge_port->port->dev, "%s - bad baud rate\n", __FUNCTION__);
		return status;
	}

	// Alloc memory for the string of commands.
	cmdBuffer =  kmalloc (0x100, GFP_ATOMIC);
	if (!cmdBuffer) {
		dev_err(&edge_port->port->dev, "%s - kmalloc(%d) failed.\n", __FUNCTION__, 0x100);
		return -ENOMEM;
	}
	currCmd = cmdBuffer;

	// Enable access to divisor latch
	MAKE_CMD_WRITE_REG( &currCmd, &cmdLen, number, LCR, LCR_DL_ENABLE );

	// Write the divisor itself
	MAKE_CMD_WRITE_REG( &currCmd, &cmdLen, number, DLL, LOW8 (divisor) );
	MAKE_CMD_WRITE_REG( &currCmd, &cmdLen, number, DLM, HIGH8(divisor) );

	// Restore original value to disable access to divisor latch
	MAKE_CMD_WRITE_REG( &currCmd, &cmdLen, number, LCR, edge_port->shadowLCR);

	status = write_cmd_usb(edge_port, cmdBuffer, cmdLen );
	if (status) {
		/* something bad happened, let's free up the memory */
		kfree (cmdBuffer);
	}

	return status;
}


/*****************************************************************************
 * calc_baud_rate_divisor
 *	this function calculates the proper baud rate divisor for the specified
 *	baud rate.
 *****************************************************************************/
static int calc_baud_rate_divisor (int baudrate, int *divisor)
{
	int i;
	__u16 custom;


	dbg("%s - %d", __FUNCTION__, baudrate);

	for (i = 0; i < NUM_ENTRIES(divisor_table); i++) {
		if ( divisor_table[i].BaudRate == baudrate ) {
			*divisor = divisor_table[i].Divisor;
			return 0;
		}
	}

	// We have tried all of the standard baud rates
	// lets try to calculate the divisor for this baud rate
	// Make sure the baud rate is reasonable
	if (baudrate > 50 && baudrate < 230400) {
		// get divisor
		custom = (__u16)((230400L + baudrate/2) / baudrate);

		*divisor = custom;

		dbg("%s - Baud %d = %d\n", __FUNCTION__, baudrate, custom);
		return 0;
	}

	return -1;
}


/*****************************************************************************
 * send_cmd_write_uart_register
 *	this function builds up a uart register message and sends to to the device.
 *****************************************************************************/
static int send_cmd_write_uart_register (struct edgeport_port *edge_port, __u8 regNum, __u8 regValue)
{
	unsigned char *cmdBuffer;
	unsigned char *currCmd;
	unsigned long cmdLen = 0;
	int status;

	dbg("%s - write to %s register 0x%02x", (regNum == MCR) ? "MCR" : "LCR", __FUNCTION__, regValue);

	// Alloc memory for the string of commands.
	cmdBuffer = kmalloc (0x10, GFP_ATOMIC);
	if (cmdBuffer == NULL ) {
		return -ENOMEM;
	}

	currCmd = cmdBuffer;

	// Build a cmd in the buffer to write the given register
	MAKE_CMD_WRITE_REG (&currCmd, &cmdLen,
			    edge_port->port->number - edge_port->port->serial->minor,
			    regNum, regValue);

	status = write_cmd_usb(edge_port, cmdBuffer, cmdLen);
	if (status) {
		/* something bad happened, let's free up the memory */
		kfree (cmdBuffer);
	}

	return status;
}


/*****************************************************************************
 * change_port_settings
 *	This routine is called to set the UART on the device to match the specified
 *	new settings.
 *****************************************************************************/
#ifndef CMSPAR
#define CMSPAR 0
#endif
static void change_port_settings (struct edgeport_port *edge_port, struct termios *old_termios)
{
	struct tty_struct *tty;
	int baud;
	unsigned cflag;
	__u8 mask = 0xff;
	__u8 lData;
	__u8 lParity;
	__u8 lStop;
	__u8 rxFlow;
	__u8 txFlow;
	int status;

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

	if ((!edge_port->open) &&
	    (!edge_port->openPending)) {
		dbg("%s - port not opened", __FUNCTION__);
		return;
	}

	tty = edge_port->port->tty;
	if ((!tty) ||
	    (!tty->termios)) {
		dbg("%s - no tty structures", __FUNCTION__);
		return;
	}

	cflag = tty->termios->c_cflag;

	switch (cflag & CSIZE) {
		case CS5:   lData = LCR_BITS_5; mask = 0x1f;    dbg("%s - data bits = 5", __FUNCTION__);   break;
		case CS6:   lData = LCR_BITS_6; mask = 0x3f;    dbg("%s - data bits = 6", __FUNCTION__);   break;
		case CS7:   lData = LCR_BITS_7; mask = 0x7f;    dbg("%s - data bits = 7", __FUNCTION__);   break;
		default:
		case CS8:   lData = LCR_BITS_8;                 dbg("%s - data bits = 8", __FUNCTION__);   break;
	}

	lParity = LCR_PAR_NONE;
	if (cflag & PARENB) {
		if (cflag & CMSPAR) {
			if (cflag & PARODD) {
				lParity = LCR_PAR_MARK;
				dbg("%s - parity = mark", __FUNCTION__);
			} else {
				lParity = LCR_PAR_SPACE;
				dbg("%s - parity = space", __FUNCTION__);
			}
		} else if (cflag & PARODD) {
			lParity = LCR_PAR_ODD;
			dbg("%s - parity = odd", __FUNCTION__);
		} else {
			lParity = LCR_PAR_EVEN;
			dbg("%s - parity = even", __FUNCTION__);
		}
	} else {
		dbg("%s - parity = none", __FUNCTION__);
	}

	if (cflag & CSTOPB) {
		lStop = LCR_STOP_2;
		dbg("%s - stop bits = 2", __FUNCTION__);
	} else {
		lStop = LCR_STOP_1;
		dbg("%s - stop bits = 1", __FUNCTION__);
	}

	/* figure out the flow control settings */
	rxFlow = txFlow = 0x00;
	if (cflag & CRTSCTS) {
		rxFlow |= IOSP_RX_FLOW_RTS;
		txFlow |= IOSP_TX_FLOW_CTS;
		dbg("%s - RTS/CTS is enabled", __FUNCTION__);
	} else {
		dbg("%s - RTS/CTS is disabled", __FUNCTION__);
	}

	/* if we are implementing XON/XOFF, set the start and stop character in the device */
	if (I_IXOFF(tty) || I_IXON(tty)) {
		unsigned char stop_char  = STOP_CHAR(tty);
		unsigned char start_char = START_CHAR(tty);

		send_iosp_ext_cmd (edge_port, IOSP_CMD_SET_XON_CHAR, start_char);
		send_iosp_ext_cmd (edge_port, IOSP_CMD_SET_XOFF_CHAR, stop_char);

		/* if we are implementing INBOUND XON/XOFF */
		if (I_IXOFF(tty)) {
			rxFlow |= IOSP_RX_FLOW_XON_XOFF;
			dbg("%s - INBOUND XON/XOFF is enabled, XON = %2x, XOFF = %2x", __FUNCTION__, start_char, stop_char);
		} else {
			dbg("%s - INBOUND XON/XOFF is disabled", __FUNCTION__);
		}

		/* if we are implementing OUTBOUND XON/XOFF */
		if (I_IXON(tty)) {
			txFlow |= IOSP_TX_FLOW_XON_XOFF;
			dbg("%s - OUTBOUND XON/XOFF is enabled, XON = %2x, XOFF = %2x", __FUNCTION__, start_char, stop_char);
		} else {
			dbg("%s - OUTBOUND XON/XOFF is disabled", __FUNCTION__);
		}
	}

	/* Set flow control to the configured value */
	send_iosp_ext_cmd (edge_port, IOSP_CMD_SET_RX_FLOW, rxFlow);
	send_iosp_ext_cmd (edge_port, IOSP_CMD_SET_TX_FLOW, txFlow);


	edge_port->shadowLCR &= ~(LCR_BITS_MASK | LCR_STOP_MASK | LCR_PAR_MASK);
	edge_port->shadowLCR |= (lData | lParity | lStop);

	edge_port->validDataMask = mask;

	/* Send the updated LCR value to the EdgePort */
	status = send_cmd_write_uart_register(edge_port, LCR, edge_port->shadowLCR);
	if (status != 0) {
		return;
	}

	/* set up the MCR register and send it to the EdgePort */
	edge_port->shadowMCR = MCR_MASTER_IE;
	if (cflag & CBAUD) {
		edge_port->shadowMCR |= (MCR_DTR | MCR_RTS);
	}
	status = send_cmd_write_uart_register(edge_port, MCR, edge_port->shadowMCR);
	if (status != 0) {
		return;
	}

	/* Determine divisor based on baud rate */
	baud = tty_get_baud_rate(tty);
	if (!baud) {
		/* pick a default, any default... */
		baud = 9600;
	}

	dbg("%s - baud rate = %d", __FUNCTION__, baud);
	status = send_cmd_write_baud_rate (edge_port, baud);

	return;
}


/****************************************************************************
 * unicode_to_ascii
 *	Turns a string from Unicode into ASCII.
 *	Doesn't do a good job with any characters that are outside the normal
 *	ASCII range, but it's only for debugging...
 *	NOTE: expects the unicode in LE format
 ****************************************************************************/
static void unicode_to_ascii (char *string, __le16 *unicode, int unicode_size)
{
	int i;

	if (unicode_size <= 0)
		return;

	for (i = 0; i < unicode_size; ++i)
		string[i] = (char)(le16_to_cpu(unicode[i]));
	string[unicode_size] = 0x00;
}


/****************************************************************************
 * get_manufacturing_desc
 *	reads in the manufacturing descriptor and stores it into the serial 
 *	structure.
 ****************************************************************************/
static void get_manufacturing_desc (struct edgeport_serial *edge_serial)
{
	int response;

	dbg("getting manufacturer descriptor");

	response = rom_read (edge_serial->serial, (EDGE_MANUF_DESC_ADDR & 0xffff0000) >> 16, 
			    (__u16)(EDGE_MANUF_DESC_ADDR & 0x0000ffff), EDGE_MANUF_DESC_LEN,
			    (__u8 *)(&edge_serial->manuf_descriptor));

	if (response < 1) {
		dev_err(&edge_serial->serial->dev->dev, "error in getting manufacturer descriptor\n");
	} else {
		char string[30];
		dbg("**Manufacturer Descriptor");
		dbg("  RomSize:        %dK", edge_serial->manuf_descriptor.RomSize);
		dbg("  RamSize:        %dK", edge_serial->manuf_descriptor.RamSize);
		dbg("  CpuRev:         %d", edge_serial->manuf_descriptor.CpuRev);
		dbg("  BoardRev:       %d", edge_serial->manuf_descriptor.BoardRev);
		dbg("  NumPorts:       %d", edge_serial->manuf_descriptor.NumPorts);
		dbg("  DescDate:       %d/%d/%d", edge_serial->manuf_descriptor.DescDate[0], edge_serial->manuf_descriptor.DescDate[1], edge_serial->manuf_descriptor.DescDate[2]+1900);
		unicode_to_ascii (string, edge_serial->manuf_descriptor.SerialNumber, edge_serial->manuf_descriptor.SerNumLength/2-1);
		dbg("  SerialNumber: %s", string);
		unicode_to_ascii (string, edge_serial->manuf_descriptor.AssemblyNumber, edge_serial->manuf_descriptor.AssemblyNumLength/2-1);
		dbg("  AssemblyNumber: %s", string);
		unicode_to_ascii (string, edge_serial->manuf_descriptor.OemAssyNumber, edge_serial->manuf_descriptor.OemAssyNumLength/2-1);
		dbg("  OemAssyNumber:  %s", string);
		dbg("  UartType:       %d", edge_serial->manuf_descriptor.UartType);
		dbg("  IonPid:         %d", edge_serial->manuf_descriptor.IonPid);
		dbg("  IonConfig:      %d", edge_serial->manuf_descriptor.IonConfig);
	}
}


/****************************************************************************
 * get_boot_desc
 *	reads in the bootloader descriptor and stores it into the serial 
 *	structure.
 ****************************************************************************/
static void get_boot_desc (struct edgeport_serial *edge_serial)
{
	int response;

	dbg("getting boot descriptor");

	response = rom_read (edge_serial->serial, (EDGE_BOOT_DESC_ADDR & 0xffff0000) >> 16, 
			    (__u16)(EDGE_BOOT_DESC_ADDR & 0x0000ffff), EDGE_BOOT_DESC_LEN,
			    (__u8 *)(&edge_serial->boot_descriptor));

	if (response < 1) {
		dev_err(&edge_serial->serial->dev->dev, "error in getting boot descriptor\n");
	} else {
		dbg("**Boot Descriptor:");
		dbg("  BootCodeLength: %d", le16_to_cpu(edge_serial->boot_descriptor.BootCodeLength));
		dbg("  MajorVersion:   %d", edge_serial->boot_descriptor.MajorVersion);
		dbg("  MinorVersion:   %d", edge_serial->boot_descriptor.MinorVersion);
		dbg("  BuildNumber:    %d", le16_to_cpu(edge_serial->boot_descriptor.BuildNumber));
		dbg("  Capabilities:   0x%x", le16_to_cpu(edge_serial->boot_descriptor.Capabilities));
		dbg("  UConfig0:       %d", edge_serial->boot_descriptor.UConfig0);
		dbg("  UConfig1:       %d", edge_serial->boot_descriptor.UConfig1);
	}
}


/****************************************************************************
 * load_application_firmware
 *	This is called to load the application firmware to the device
 ****************************************************************************/
static void load_application_firmware (struct edgeport_serial *edge_serial)
{
	struct edge_firmware_image_record *record;
	unsigned char *firmware;
	unsigned char *FirmwareImage;
	int ImageSize;
	int response;


	switch (edge_serial->product_info.iDownloadFile) {
		case EDGE_DOWNLOAD_FILE_I930:
			dbg("downloading firmware version (930) %d.%d.%d", 
			    OperationalCodeImageVersion_GEN1.MajorVersion, 
			    OperationalCodeImageVersion_GEN1.MinorVersion, 
			    OperationalCodeImageVersion_GEN1.BuildNumber);
			firmware = &OperationalCodeImage_GEN1[0];
			FirmwareImage = &OperationalCodeImage_GEN1[0];
			ImageSize = sizeof(OperationalCodeImage_GEN1);
			break;

		case EDGE_DOWNLOAD_FILE_80251:
			dbg("downloading firmware version (80251) %d.%d.%d", 
			    OperationalCodeImageVersion_GEN2.MajorVersion, 
			    OperationalCodeImageVersion_GEN2.MinorVersion, 
			    OperationalCodeImageVersion_GEN2.BuildNumber);
			firmware = &OperationalCodeImage_GEN2[0];
			FirmwareImage = &OperationalCodeImage_GEN2[0];
			ImageSize = sizeof(OperationalCodeImage_GEN2);
			break;

		case EDGE_DOWNLOAD_FILE_NONE:
			dbg     ("No download file specified, skipping download\n");
			return;

		default:
			return;
	}


	for (;;) {
		record = (struct edge_firmware_image_record *)firmware;
		response = sram_write (edge_serial->serial, le16_to_cpu(record->ExtAddr), le16_to_cpu(record->Addr), le16_to_cpu(record->Len), &record->Data[0]);
		if (response < 0) {
			dev_err(&edge_serial->serial->dev->dev, "sram_write failed (%x, %x, %d)\n", le16_to_cpu(record->ExtAddr), le16_to_cpu(record->Addr), le16_to_cpu(record->Len));
			break;
		}
		firmware += sizeof (struct edge_firmware_image_record) + le16_to_cpu(record->Len);
		if (firmware >= &FirmwareImage[ImageSize]) {
			break;
		}
	}

	dbg("sending exec_dl_code");
	response = usb_control_msg (edge_serial->serial->dev, 
				    usb_sndctrlpipe(edge_serial->serial->dev, 0), 
				    USB_REQUEST_ION_EXEC_DL_CODE, 
				    0x40, 0x4000, 0x0001, NULL, 0, 3000);

	return;
}


/****************************************************************************
 * edge_startup
 ****************************************************************************/
static int edge_startup (struct usb_serial *serial)
{
	struct edgeport_serial *edge_serial;
	struct edgeport_port *edge_port;
	struct usb_device *dev;
	int i;

	dev = serial->dev;

	/* create our private serial structure */
	edge_serial = kmalloc (sizeof(struct edgeport_serial), GFP_KERNEL);
	if (edge_serial == NULL) {
		dev_err(&serial->dev->dev, "%s - Out of memory\n", __FUNCTION__);
		return -ENOMEM;
	}
	memset (edge_serial, 0, sizeof(struct edgeport_serial));
	spin_lock_init(&edge_serial->es_lock);
	edge_serial->serial = serial;
	usb_set_serial_data(serial, edge_serial);

	/* get the name for the device from the device */
	if ( (i = get_string(dev, dev->descriptor.iManufacturer, &edge_serial->name[0])) != 0) {
		edge_serial->name[i-1] = ' ';
	}

	get_string(dev, dev->descriptor.iProduct, &edge_serial->name[i]);

	dev_info(&serial->dev->dev, "%s detected\n", edge_serial->name);

	/* get the manufacturing descriptor for this device */
	get_manufacturing_desc (edge_serial);

	/* get the boot descriptor */
	get_boot_desc (edge_serial);

	get_product_info(edge_serial);

	/* set the number of ports from the manufacturing description */
	/* serial->num_ports = serial->product_info.NumPorts; */
	if (edge_serial->product_info.NumPorts != serial->num_ports) {
		warn("%s - Device Reported %d serial ports vs core "
		     "thinking we have %d ports, email greg@kroah.com this info.",
		     __FUNCTION__, edge_serial->product_info.NumPorts, 
		     serial->num_ports);
	}

	dbg("%s - time 1 %ld", __FUNCTION__, jiffies);

	/* now load the application firmware into this device */
	load_application_firmware (edge_serial);

	dbg("%s - time 2 %ld", __FUNCTION__, jiffies);

	/* Check current Edgeport EEPROM and update if necessary */
	update_edgeport_E2PROM (edge_serial);
	
	dbg("%s - time 3 %ld", __FUNCTION__, jiffies);

	/* set the configuration to use #1 */
//	dbg("set_configuration 1");
//	usb_set_configuration (dev, 1);

	/* we set up the pointers to the endpoints in the edge_open function, 
	 * as the structures aren't created yet. */

	/* set up our port private structures */
	for (i = 0; i < serial->num_ports; ++i) {
		edge_port = kmalloc (sizeof(struct edgeport_port), GFP_KERNEL);
		if (edge_port == NULL) {
			dev_err(&serial->dev->dev, "%s - Out of memory\n", __FUNCTION__);
			usb_set_serial_data(serial, NULL);
			kfree(edge_serial);
			return -ENOMEM;
		}
		memset (edge_port, 0, sizeof(struct edgeport_port));
		spin_lock_init(&edge_port->ep_lock);
		edge_port->port = serial->port[i];
		usb_set_serial_port_data(serial->port[i], edge_port);
	}
	
	return 0;
}


/****************************************************************************
 * edge_shutdown
 *	This function is called whenever the device is removed from the usb bus.
 ****************************************************************************/
static void edge_shutdown (struct usb_serial *serial)
{
	int i;

	dbg("%s", __FUNCTION__);

	/* stop reads and writes on all ports */
	for (i=0; i < serial->num_ports; ++i) {
		kfree (usb_get_serial_port_data(serial->port[i]));
		usb_set_serial_port_data(serial->port[i],  NULL);
	}
	kfree (usb_get_serial_data(serial));
	usb_set_serial_data(serial, NULL);
}


/****************************************************************************
 * edgeport_init
 *	This is called by the module subsystem, or on startup to initialize us
 ****************************************************************************/
static int __init edgeport_init(void)
{
	int retval;

	retval = usb_serial_register(&edgeport_2port_device);
	if (retval)
		goto failed_2port_device_register;
	retval = usb_serial_register(&edgeport_4port_device);
	if (retval)
		goto failed_4port_device_register;
	retval = usb_serial_register(&edgeport_8port_device);
	if (retval)
		goto failed_8port_device_register;
	retval = usb_register(&io_driver);
	if (retval) 
		goto failed_usb_register;
	info(DRIVER_DESC " " DRIVER_VERSION);
	return 0;

failed_usb_register:
	usb_serial_deregister(&edgeport_8port_device);
failed_8port_device_register:
	usb_serial_deregister(&edgeport_4port_device);
failed_4port_device_register:
	usb_serial_deregister(&edgeport_2port_device);
failed_2port_device_register:
	return retval;
}


/****************************************************************************
 * edgeport_exit
 *	Called when the driver is about to be unloaded.
 ****************************************************************************/
static void __exit edgeport_exit (void)
{
	usb_deregister (&io_driver);
	usb_serial_deregister (&edgeport_2port_device);
	usb_serial_deregister (&edgeport_4port_device);
	usb_serial_deregister (&edgeport_8port_device);
}

module_init(edgeport_init);
module_exit(edgeport_exit);

/* Module information */
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");

module_param(low_latency, bool, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(debug, "Low latency enabled or not");