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[/] [or1k/] [trunk/] [linux/] [linux-2.4/] [drivers/] [usb/] [serial/] [io_edgeport.c] - Blame information for rev 1765

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/*
 * 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
 *
 * 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/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>
 
#ifdef CONFIG_USB_SERIAL_DEBUG
        static int debug = 1;
#else
        static int debug;
#endif
 
#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 "v2.3"
#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 */
 
#ifndef SERIAL_MAGIC
        #define SERIAL_MAGIC    0x6702
#endif
#define PORT_MAGIC              0x7301
 
 
/* 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 */
 
        __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 */
 
        __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      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);
static void edge_bulk_in_callback       (struct urb *urb);
static void edge_bulk_out_data_callback (struct urb *urb);
static void edge_bulk_out_cmd_callback  (struct urb *urb);
 
/* 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, int from_user, 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_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 */
 
 
/* function prototypes for all of our local functions */
static int  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 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, short *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;
        __u16 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) {
                                err("rom_write failed (%x, %x, %d)", 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)(edge_serial->serial->dev->descriptor.idProduct & ~ION_DEVICE_ID_GENERATION_2);
        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 (edge_serial->serial->dev->descriptor.idProduct & ION_DEVICE_ID_GENERATION_2) {
                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 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__);
 
        if (serial_paranoia_check (edge_serial->serial, __FUNCTION__)) {
                return;
        }
 
        if (urb->status) {
                dbg("%s - nonzero control read status received: %d", __FUNCTION__, urb->status);
                return;
        }
 
        // process this interrupt-read even if there are no ports open
        if (length) {
                usb_serial_debug_data (__FILE__, __FUNCTION__, length, data);
 
                if (length > 1) {
                        bytes_avail = data[0] | (data[1] << 8);
                        if (bytes_avail) {
                                edge_serial->rxBytesAvail += bytes_avail;
                                dbg("%s - bytes_avail = %d, rxBytesAvail %d", __FUNCTION__, bytes_avail, edge_serial->rxBytesAvail);
 
                                if ((edge_serial->rxBytesAvail > 0) &&
                                    (edge_serial->read_urb->status != -EINPROGRESS)) {
                                        dbg(" --- Posting a read");
 
                                        /* 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);
                                        if (result) {
                                                dbg("%s - usb_submit_urb(read bulk) failed with result = %d", __FUNCTION__, result);
                                        }
                                }
                        }
                }
                /* 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];
                                if (port_paranoia_check (port, __FUNCTION__) == 0) {
                                        edge_port = (struct edgeport_port *)port->private;
                                        if (edge_port->open) {
                                                edge_port->txCredits += txCredits;
                                                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)
                                                        wake_up_interruptible(&edge_port->port->tty->write_wait);
 
                                                // Since we have more credit, check if more data can be sent
                                                send_more_port_data(edge_serial, edge_port);
                                        }
                                }
                        }
                        position += 2;
                        ++portNumber;
                }
        }
}
 
 
/*****************************************************************************
 * 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 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 (serial_paranoia_check (edge_serial->serial, __FUNCTION__)) {
                return;
        }
 
        if (urb->status) {
                dbg("%s - nonzero read bulk status received: %d", __FUNCTION__, urb->status);
                return;
        }
 
        if (urb->actual_length) {
                raw_data_length = urb->actual_length;
 
                usb_serial_debug_data (__FILE__, __FUNCTION__, raw_data_length, data);
 
                /* 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) &&
                    (edge_serial->read_urb->status != -EINPROGRESS)) {
                        dbg(" --- Posting a read");
 
                        /* there is, so resubmit our urb */
                        edge_serial->read_urb->dev = edge_serial->serial->dev;
                        status = usb_submit_urb(edge_serial->read_urb);
                        if (status) {
                                err("%s - usb_submit_urb(read bulk) failed, status = %d", __FUNCTION__, status);
                        }
                }
        }
}
 
 
/*****************************************************************************
 * 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 edgeport_port *edge_port = (struct edgeport_port *)urb->context;
        struct tty_struct *tty;
 
        dbg("%s", __FUNCTION__);
 
        if (port_paranoia_check (edge_port->port, __FUNCTION__)) {
                return;
        }
 
        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 */
                if ((tty->flags & (1 << TTY_DO_WRITE_WAKEUP)) && tty->ldisc.write_wakeup) {
                        (tty->ldisc.write_wakeup)(tty);
                }
 
                /* tell the tty driver that something has changed */
                wake_up_interruptible(&tty->write_wait);
        }
 
        // 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 *)(edge_port->port->serial->private), 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 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_unlink_urb (urb);
        usb_free_urb   (urb);
 
        if (port_paranoia_check (edge_port->port, __FUNCTION__)) {
                return;
        }
 
        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)
                wake_up_interruptible(&tty->write_wait);
 
        /* 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 = (struct edgeport_port *)port->private;
        struct usb_serial *serial;
        struct edgeport_serial *edge_serial;
        int response;
        int timeout;
 
        if (port_paranoia_check (port, __FUNCTION__))
                return -ENODEV;
 
        dbg("%s - port %d", __FUNCTION__, port->number);
 
        if (edge_port == NULL)
                return -ENODEV;
 
        /* force low_latency on so that our tty_push actually forces the data through,
           otherwise it is scheduled, and with high data rates (like with OHCI) data
           can get lost. */
        if (port->tty)
                port->tty->low_latency = 1;
 
        /* 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 = (struct edgeport_serial *)serial->private;
        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 */
                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 */
                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);
 
                /* 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);
                if (response) {
                        err("%s - Error %d submitting control urb", __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) {
                err("%s - error sending open port command", __FUNCTION__);
                edge_port->openPending = FALSE;
                return -ENODEV;
        }
 
        /* now wait for the port to be completly 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);
 
        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 usb_serial *serial;
        struct edgeport_serial *edge_serial;
        struct edgeport_port *edge_port;
        int status;
 
        if (port_paranoia_check (port, __FUNCTION__))
                return;
 
        dbg("%s - port %d", __FUNCTION__, port->number);
 
        serial = get_usb_serial (port, __FUNCTION__);
        if (!serial)
                return;
 
        edge_serial = (struct edgeport_serial *)serial->private;
        edge_port = (struct edgeport_port *)port->private;
        if ((edge_serial == NULL) || (edge_port == NULL))
                return;
 
        if (serial->dev) {
                // 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_unlink_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);
        }
        if (edge_port->txfifo.fifo) {
                kfree(edge_port->txfifo.fifo);
        }
 
        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, int from_user, const unsigned char *data, int count)
{
        struct edgeport_port *edge_port = (struct edgeport_port *)port->private;
        struct TxFifo *fifo;
        int copySize;
        int bytesleft;
        int firsthalf;
        int secondhalf;
 
        dbg("%s - port %d", __FUNCTION__, port->number);
 
        if (edge_port == NULL)
                return -ENODEV;
 
        // get a pointer to the Tx fifo
        fifo = &edge_port->txfifo;
 
        // 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__);
                return 0;
        }
 
        // 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 */
        if (from_user) {
                if (copy_from_user(&fifo->fifo[fifo->head], data, firsthalf))
                        return -EFAULT;
        } else {
                memcpy(&fifo->fifo[fifo->head], data, firsthalf);
        }
 
        // 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);
                if (from_user) {
                        if (copy_from_user(&fifo->fifo[fifo->head], &data[firsthalf], secondhalf))
                                return -EFAULT;
                } else {
                        memcpy(&fifo->fifo[fifo->head], &data[firsthalf], secondhalf);
                }
                // 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
        }
 
        if (copySize) {
                usb_serial_debug_data (__FILE__, __FUNCTION__, copySize, data);
        }
 
        send_more_port_data((struct edgeport_serial *)port->serial->private, 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;
 
        dbg("%s(%d)", __FUNCTION__, edge_port->port->number);
 
        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);
                return;
        }
 
        // 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)) {
                dbg("%s(%d) Not enough credit - fifo %d TxCredit %d", __FUNCTION__, edge_port->port->number, fifo->count, edge_port->txCredits );
                return;
        }
 
        // 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) {
                err("%s - no more kernel memory...", __FUNCTION__);
                edge_port->write_in_progress = FALSE;
                return;
        }
        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 (__FILE__, __FUNCTION__, count, &buffer[2]);
        }
 
        /* fill up the urb with all of our data and submit it */
        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);
 
        /* set the USB_BULK_QUEUE flag so that we can shove a bunch of urbs at once down the pipe */
        urb->transfer_flags |= USB_QUEUE_BULK;
 
        urb->dev = edge_serial->serial->dev;
        /* decrement the number of credits we have by the number we just sent */
        edge_port->txCredits -= count;
        edge_port->icount.tx += count;
 
        status = usb_submit_urb(urb);
        if (status) {
                /* something went wrong */
                dbg("%s - usb_submit_urb(write bulk) failed", __FUNCTION__);
                edge_port->write_in_progress = FALSE;
 
                /*revert the count if 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);
}
 
 
/*****************************************************************************
 * 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 = (struct edgeport_port *)(port->private);
        int room;
 
        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
        room = edge_port->txCredits - edge_port->txfifo.count;
 
        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 = (struct edgeport_port *)(port->private);
        int num_chars;
 
        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;
        }
 
        num_chars = edge_port->maxTxCredits - edge_port->txCredits + edge_port->txfifo.count;
        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 = (struct edgeport_port *)(port->private);
        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, 0, &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 = (struct edgeport_port *)(port->private);
        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, 0, &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 = (struct edgeport_port *)(port->private);
        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) &&
                    (RELEVANT_IFLAG(tty->termios->c_iflag) == RELEVANT_IFLAG(old_termios->c_iflag))) {
                        dbg("%s - nothing to change", __FUNCTION__);
                        return;
                }
        }
 
        dbg("%s - clfag %08x iflag %08x", __FUNCTION__,
            tty->termios->c_cflag,
            RELEVANT_IFLAG(tty->termios->c_iflag));
        if (old_termios) {
                dbg("%s - old clfag %08x old iflag %08x", __FUNCTION__,
                    old_termios->c_cflag,
                    RELEVANT_IFLAG(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 *value)
{
        unsigned int result = 0;
 
        if (edge_port->maxTxCredits == edge_port->txCredits &&
            edge_port->txfifo.count == 0) {
                dbg("%s -- Empty", __FUNCTION__);
                result = TIOCSER_TEMT;
        }
 
        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 *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 set_modem_info(struct edgeport_port *edge_port, unsigned int cmd, unsigned int *value)
{
        unsigned int mcr = edge_port->shadowMCR;
        unsigned int arg;
 
        if (copy_from_user(&arg, value, sizeof(int)))
                return -EFAULT;
 
        switch (cmd) {
                case TIOCMBIS:
                        if (arg & TIOCM_RTS)
                                mcr |= MCR_RTS;
                        if (arg & TIOCM_DTR)
                                mcr |= MCR_DTR;
                        if (arg & TIOCM_LOOP)
                                mcr |= MCR_LOOPBACK;
                        break;
 
                case TIOCMBIC:
                        if (arg & TIOCM_RTS)
                                mcr &= ~MCR_RTS;
                        if (arg & TIOCM_DTR)
                                mcr &= ~MCR_DTR;
                        if (arg & TIOCM_LOOP)
                                mcr &= ~MCR_LOOPBACK;
                        break;
 
                case TIOCMSET:
                        /* turn off the RTS and DTR and LOOPBACK
                         * and then only turn on what was asked to */
                        mcr &=  ~(MCR_RTS | MCR_DTR | MCR_LOOPBACK);
                        mcr |= ((arg & TIOCM_RTS) ? MCR_RTS : 0);
                        mcr |= ((arg & TIOCM_DTR) ? MCR_DTR : 0);
                        mcr |= ((arg & TIOCM_LOOP) ? MCR_LOOPBACK : 0);
                        break;
        }
 
        edge_port->shadowMCR = mcr;
 
        send_cmd_write_uart_register(edge_port, MCR, edge_port->shadowMCR);
 
        return 0;
}
 
static int get_modem_info(struct edgeport_port *edge_port, unsigned int *value)
{
        unsigned int result = 0;
        unsigned int msr = edge_port->shadowMSR;
        unsigned int 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);
 
        if (copy_to_user(value, &result, sizeof(int)))
                return -EFAULT;
        return 0;
}
 
 
 
static int get_serial_info(struct edgeport_port *edge_port, struct serial_struct * 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 = (struct edgeport_port *)(port->private);
        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 *) arg);
                        break;
 
                case TIOCSERGETLSR:
                        dbg("%s (%d) TIOCSERGETLSR", __FUNCTION__,  port->number);
                        return get_lsr_info(edge_port, (unsigned int *) arg);
                        return 0;
 
                case TIOCMBIS:
                case TIOCMBIC:
                case TIOCMSET:
                        dbg("%s (%d) TIOCMSET/TIOCMBIC/TIOCMSET", __FUNCTION__,  port->number);
                        return set_modem_info(edge_port, cmd, (unsigned int *) arg);
 
                case TIOCMGET:
                        dbg("%s (%d) TIOCMGET", __FUNCTION__,  port->number);
                        return get_modem_info(edge_port, (unsigned int *) arg);
 
                case TIOCGSERIAL:
                        dbg("%s (%d) TIOCGSERIAL", __FUNCTION__,  port->number);
                        return get_serial_info(edge_port, (struct serial_struct *) 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;
                        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 *)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 = (struct edgeport_port *)(port->private);
        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 int 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;
        int i;
 
        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];
                                        if (port_paranoia_check (port, __FUNCTION__) == 0) {
                                                edge_port = (struct edgeport_port *)port->private;
                                                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);
                                                                for (i = 0; i < rxLen ; ++i) {
                                                                        /* if we insert more than TTY_FLIPBUF_SIZE characters, we drop them. */
                                                                        if(tty->flip.count >= TTY_FLIPBUF_SIZE) {
                                                                                tty_flip_buffer_push(tty);
                                                                        }
                                                                        /* this doesn't actually push the data through unless tty->low_latency is set */
                                                                        tty_insert_flip_char(tty, buffer[i], 0);
                                                                }
                                                                tty_flip_buffer_push(tty);
                                                        }
                                                        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;
 
                }
        }
 
        return 0;
}
 
 
/*****************************************************************************
 * 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];
        if (port_paranoia_check (port, __FUNCTION__)) {
                return;
        }
        edge_port = (struct edgeport_port *)port->private;
        if (edge_port == NULL) {
                err("%s - edge_port == NULL for port %d", __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;
}
 
 
/*****************************************************************************
 * 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) {
                tty_insert_flip_char(edge_port->port->tty, data, 0);
                tty_flip_buffer_push(edge_port->port->tty);
        }
 
        /* 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) {
                err("%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) {
                err("%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) {
                err("%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) {
                err("%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 = (struct edgeport_serial *)edge_port->port->serial->private;
        int status = 0;
        struct urb *urb;
        int timeout;
 
        usb_serial_debug_data (__FILE__, __FUNCTION__, length, buffer);
 
        /* Allocate our next urb */
        urb = usb_alloc_urb (0);
        if (!urb)
                return -ENOMEM;
 
        CmdUrbs++;
        dbg("%s - ALLOCATE URB %p (outstanding %d)", __FUNCTION__, urb, CmdUrbs);
 
        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);
 
        /* set the USB_BULK_QUEUE flag so that we can shove a bunch of urbs at once down the pipe */
        urb->transfer_flags |= USB_QUEUE_BULK;
 
        edge_port->commandPending = TRUE;
        status = usb_submit_urb(urb);
 
        if (status) {
                /* something went wrong */
                dbg("%s - usb_submit_urb(write bulk) failed", __FUNCTION__);
                usb_unlink_urb (urb);
                usb_free_urb   (urb);
                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) {
                err("%s - bad baud rate", __FUNCTION__);
                return status;
        }
 
        // Alloc memory for the string of commands.
        cmdBuffer =  kmalloc (0x100, GFP_ATOMIC);
        if (!cmdBuffer) {
                err("%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;
        __u16 round1;
        __u16 round;
 
 
        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 < 230400) {
                // get divisor
                custom = (__u16)(230400L  / baudrate);
 
                // Check for round off
                round1 = (__u16)(2304000L / baudrate);
                round = (__u16)(round1 - (custom * 10));
                if (round > 4) {
                        custom++;
                }
                *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.
 *****************************************************************************/
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 & 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, short *unicode, int unicode_size)
{
        int i;
        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) {
                err("error in getting manufacturer descriptor");
        } 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) {
                err("error in getting boot descriptor");
        } 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) {
                        err("sram_write failed (%x, %x, %d)", le16_to_cpu(record->ExtAddr), le16_to_cpu(record->Addr), 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) {
                err("%s - Out of memory", __FUNCTION__);
                return -ENOMEM;
        }
        memset (edge_serial, 0, sizeof(struct edgeport_serial));
        edge_serial->serial = serial;
        serial->private = 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]);
 
        info("%s detected", 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) {
                        err("%s - Out of memory", __FUNCTION__);
                        return -ENOMEM;
                }
                memset (edge_port, 0, sizeof(struct edgeport_port));
                edge_port->port = &serial->port[i];
                serial->port[i].private = 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 (serial->port[i].private);
                serial->port[i].private = NULL;
        }
        kfree (serial->private);
        serial->private = NULL;
}
 
 
/****************************************************************************
 * edgeport_init
 *      This is called by the module subsystem, or on startup to initialize us
 ****************************************************************************/
int __init edgeport_init(void)
{
        usb_serial_register (&edgeport_1port_device);
        usb_serial_register (&edgeport_2port_device);
        usb_serial_register (&edgeport_4port_device);
        usb_serial_register (&edgeport_8port_device);
        info(DRIVER_DESC " " DRIVER_VERSION);
        return 0;
}
 
 
 
/****************************************************************************
 * edgeport_exit
 *      Called when the driver is about to be unloaded.
 ****************************************************************************/
void __exit edgeport_exit (void)
{
        usb_serial_deregister (&edgeport_1port_device);
        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_PARM(debug, "i");
MODULE_PARM_DESC(debug, "Debug enabled or not");
 
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[/] [or1k/] [trunk/] [linux/] [linux-2.4/] [drivers/] [usb/] [serial/] [io_edgeport.c] - Blame information for rev 1765

Line No.	Rev	Author	Line
1	1275	phoenix	`/*`
2			`* Edgeport USB Serial Converter driver`
3			`*`
4			`* Copyright (C) 2000 Inside Out Networks, All rights reserved.`
5			`* Copyright (C) 2001-2002 Greg Kroah-Hartman <greg@kroah.com>`
6			`*`
7			`* This program is free software; you can redistribute it and/or modify`
8			`* it under the terms of the GNU General Public License as published by`
9			`* the Free Software Foundation; either version 2 of the License, or`
10			`* (at your option) any later version.`
11			`*`
12			`* Supports the following devices:`
13			`* Edgeport/4`
14			`* Edgeport/4t`
15			`* Edgeport/2`
16			`* Edgeport/4i`
17			`* Edgeport/2i`
18			`* Edgeport/421`
19			`* Edgeport/21`
20			`* Rapidport/4`
21			`* Edgeport/8`
22			`* Edgeport/2D8`
23			`* Edgeport/4D8`
24			`* Edgeport/8i`
25			`*`
26			`* Version history:`
27			`*`
28			`* 2003_04_03 al borchers`
29			`* - fixed a bug (that shows up with dosemu) where the tty struct is`
30			`* used in a callback after it has been freed`
31			`*`
32			`* 2.3 2002_03_08 greg kroah-hartman`
33			`* - fixed bug when multiple devices were attached at the same time.`
34			`*`
35			`* 2.2 2001_11_14 greg kroah-hartman`
36			`* - fixed bug in edge_close that kept the port from being used more`
37			`* than once.`
38			`* - fixed memory leak on device removal.`
39			`* - fixed potential double free of memory when command urb submitting`
40			`* failed.`