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io_ti.c

/*
 * Edgeport USB Serial Converter driver
 *
 * Copyright (C) 2000-2002 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:
 *    EP/1 EP/2 EP/4 EP/21 EP/22 EP/221 EP/42 EP/421 WATCHPORT
 *
 * For questions or problems with this driver, contact Inside Out
 * Networks technical support, or Peter Berger <pberger@brimson.com>,
 * or Al Borchers <alborchers@steinerpoint.com>.
 *
 * Version history:
 *
 *    July 11, 2002     Removed 4 port device structure since all TI UMP 
 *                chips have only 2 ports 
 *                David Iacovelli (davidi@ionetworks.com)
 *
 */

#include <linux/kernel.h>
#include <linux/jiffies.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/tty.h>
#include <linux/tty_driver.h>
#include <linux/tty_flip.h>
#include <linux/module.h>
#include <linux/spinlock.h>
#include <linux/serial.h>
#include <linux/ioctl.h>
#include <asm/uaccess.h>
#include <asm/semaphore.h>
#include <linux/usb.h>
#include <linux/usb/serial.h>

#include "io_16654.h"
#include "io_usbvend.h"
#include "io_ti.h"

/*
 * Version Information
 */
#define DRIVER_VERSION "v0.7mode043006"
#define DRIVER_AUTHOR "Greg Kroah-Hartman <greg@kroah.com> and David Iacovelli"
#define DRIVER_DESC "Edgeport USB Serial Driver"


/* firmware image code */
#define IMAGE_VERSION_NAME    PagableOperationalCodeImageVersion
#define IMAGE_ARRAY_NAME      PagableOperationalCodeImage
#define IMAGE_SIZE            PagableOperationalCodeSize
#include "io_fw_down3.h"      /* Define array OperationalCodeImage[] */

#define EPROM_PAGE_SIZE       64


struct edgeport_uart_buf_desc {
      __u32 count;            // Number of bytes currently in buffer
};

/* different hardware types */
#define HARDWARE_TYPE_930     0
#define HARDWARE_TYPE_TIUMP   1

// IOCTL_PRIVATE_TI_GET_MODE Definitions
#define     TI_MODE_CONFIGURING     0   // Device has not entered start device 
#define     TI_MODE_BOOT            1   // Staying in boot mode
#define TI_MODE_DOWNLOAD      2   // Made it to download mode
#define TI_MODE_TRANSITIONING 3   // Currently in boot mode but transitioning to download mode

/* read urb state */
#define EDGE_READ_URB_RUNNING 0
#define EDGE_READ_URB_STOPPING      1
#define EDGE_READ_URB_STOPPED 2

#define EDGE_LOW_LATENCY      1
#define EDGE_CLOSING_WAIT     4000  /* in .01 sec */

#define EDGE_OUT_BUF_SIZE     1024


/* Product information read from the Edgeport */
struct product_info
{
      int   TiMode;                 // Current TI Mode
      __u8  hardware_type;          // Type of hardware
} __attribute__((packed));

/* circular buffer */
struct edge_buf {
      unsigned int      buf_size;
      char        *buf_buf;
      char        *buf_get;
      char        *buf_put;
};

struct edgeport_port {
      __u16 uart_base;
      __u16 dma_address;
      __u8 shadow_msr;
      __u8 shadow_mcr;
      __u8 shadow_lsr;
      __u8 lsr_mask;
      __u32 ump_read_timeout;       /* Number of miliseconds the UMP will
                                 wait without data before completing
                                 a read short */
      int baud_rate;
      int close_pending;
      int lsr_event;
      struct edgeport_uart_buf_desc tx;
      struct async_icount     icount;
      wait_queue_head_t delta_msr_wait;   /* for handling sleeping while
                                       waiting for msr change to
                                       happen */
      struct edgeport_serial  *edge_serial;
      struct usb_serial_port  *port;
      __u8 bUartMode;         /* Port type, 0: RS232, etc. */ 
      spinlock_t ep_lock;
      int ep_read_urb_state;
      int ep_write_urb_in_use;
      struct edge_buf *ep_out_buf;
};

struct edgeport_serial {
      struct product_info product_info;
      u8 TI_I2C_Type;               // Type of I2C in UMP
      u8 TiReadI2C;                 // Set to TRUE if we have read the I2c in Boot Mode
      struct semaphore es_sem;
      int num_ports_open;
      struct usb_serial *serial;
};


/* Devices that this driver supports */
static struct usb_device_id edgeport_1port_id_table [] = {
      { USB_DEVICE(USB_VENDOR_ID_ION, ION_DEVICE_ID_TI_EDGEPORT_1) },
      { USB_DEVICE(USB_VENDOR_ID_ION, ION_DEVICE_ID_TI_TI3410_EDGEPORT_1) },
      { USB_DEVICE(USB_VENDOR_ID_ION, ION_DEVICE_ID_TI_TI3410_EDGEPORT_1I) },
      { USB_DEVICE(USB_VENDOR_ID_ION, ION_DEVICE_ID_WP_PROXIMITY) },
      { USB_DEVICE(USB_VENDOR_ID_ION, ION_DEVICE_ID_WP_MOTION) },
      { USB_DEVICE(USB_VENDOR_ID_ION, ION_DEVICE_ID_WP_MOISTURE) },
      { USB_DEVICE(USB_VENDOR_ID_ION, ION_DEVICE_ID_WP_TEMPERATURE) },
      { USB_DEVICE(USB_VENDOR_ID_ION, ION_DEVICE_ID_WP_HUMIDITY) },
      { USB_DEVICE(USB_VENDOR_ID_ION, ION_DEVICE_ID_WP_POWER) },
      { USB_DEVICE(USB_VENDOR_ID_ION, ION_DEVICE_ID_WP_LIGHT) },
      { USB_DEVICE(USB_VENDOR_ID_ION, ION_DEVICE_ID_WP_RADIATION) },
      { USB_DEVICE(USB_VENDOR_ID_ION, ION_DEVICE_ID_WP_DISTANCE) },
      { USB_DEVICE(USB_VENDOR_ID_ION, ION_DEVICE_ID_WP_ACCELERATION) },
      { USB_DEVICE(USB_VENDOR_ID_ION, ION_DEVICE_ID_WP_PROX_DIST) },
      { USB_DEVICE(USB_VENDOR_ID_ION, ION_DEVICE_ID_PLUS_PWR_HP4CD) },
      { USB_DEVICE(USB_VENDOR_ID_ION, ION_DEVICE_ID_PLUS_PWR_PCI) },
      { }
};

static struct usb_device_id edgeport_2port_id_table [] = {
      { USB_DEVICE(USB_VENDOR_ID_ION, ION_DEVICE_ID_TI_EDGEPORT_2) },
      { USB_DEVICE(USB_VENDOR_ID_ION, ION_DEVICE_ID_TI_EDGEPORT_2C) },
      { USB_DEVICE(USB_VENDOR_ID_ION, ION_DEVICE_ID_TI_EDGEPORT_2I) },
      { USB_DEVICE(USB_VENDOR_ID_ION, ION_DEVICE_ID_TI_EDGEPORT_421) },
      { USB_DEVICE(USB_VENDOR_ID_ION, ION_DEVICE_ID_TI_EDGEPORT_21) },
      { USB_DEVICE(USB_VENDOR_ID_ION, ION_DEVICE_ID_TI_EDGEPORT_42) },
      { USB_DEVICE(USB_VENDOR_ID_ION, ION_DEVICE_ID_TI_EDGEPORT_4) },
      { USB_DEVICE(USB_VENDOR_ID_ION, ION_DEVICE_ID_TI_EDGEPORT_4I) },
      { USB_DEVICE(USB_VENDOR_ID_ION, ION_DEVICE_ID_TI_EDGEPORT_22I) },
      { USB_DEVICE(USB_VENDOR_ID_ION, ION_DEVICE_ID_TI_EDGEPORT_221C) },
      { USB_DEVICE(USB_VENDOR_ID_ION, ION_DEVICE_ID_TI_EDGEPORT_22C) },
      { USB_DEVICE(USB_VENDOR_ID_ION, ION_DEVICE_ID_TI_EDGEPORT_21C) },
      /* The 4, 8 and 16 port devices show up as multiple 2 port devices */
      { USB_DEVICE(USB_VENDOR_ID_ION, ION_DEVICE_ID_TI_EDGEPORT_4S) },
      { USB_DEVICE(USB_VENDOR_ID_ION, ION_DEVICE_ID_TI_EDGEPORT_8) },
      { USB_DEVICE(USB_VENDOR_ID_ION, ION_DEVICE_ID_TI_EDGEPORT_8S) },
      { USB_DEVICE(USB_VENDOR_ID_ION, ION_DEVICE_ID_TI_EDGEPORT_416) },
      { USB_DEVICE(USB_VENDOR_ID_ION, ION_DEVICE_ID_TI_EDGEPORT_416B) },
      { }
};

/* Devices that this driver supports */
static struct usb_device_id id_table_combined [] = {
      { USB_DEVICE(USB_VENDOR_ID_ION, ION_DEVICE_ID_TI_EDGEPORT_1) },
      { USB_DEVICE(USB_VENDOR_ID_ION, ION_DEVICE_ID_TI_TI3410_EDGEPORT_1) },
      { USB_DEVICE(USB_VENDOR_ID_ION, ION_DEVICE_ID_TI_TI3410_EDGEPORT_1I) },
      { USB_DEVICE(USB_VENDOR_ID_ION, ION_DEVICE_ID_WP_PROXIMITY) },
      { USB_DEVICE(USB_VENDOR_ID_ION, ION_DEVICE_ID_WP_MOTION) },
      { USB_DEVICE(USB_VENDOR_ID_ION, ION_DEVICE_ID_WP_MOISTURE) },
      { USB_DEVICE(USB_VENDOR_ID_ION, ION_DEVICE_ID_WP_TEMPERATURE) },
      { USB_DEVICE(USB_VENDOR_ID_ION, ION_DEVICE_ID_WP_HUMIDITY) },
      { USB_DEVICE(USB_VENDOR_ID_ION, ION_DEVICE_ID_WP_POWER) },
      { USB_DEVICE(USB_VENDOR_ID_ION, ION_DEVICE_ID_WP_LIGHT) },
      { USB_DEVICE(USB_VENDOR_ID_ION, ION_DEVICE_ID_WP_RADIATION) },
      { USB_DEVICE(USB_VENDOR_ID_ION, ION_DEVICE_ID_WP_DISTANCE) },
      { USB_DEVICE(USB_VENDOR_ID_ION, ION_DEVICE_ID_WP_ACCELERATION) },
      { USB_DEVICE(USB_VENDOR_ID_ION, ION_DEVICE_ID_WP_PROX_DIST) },
      { USB_DEVICE(USB_VENDOR_ID_ION, ION_DEVICE_ID_PLUS_PWR_HP4CD) },
      { USB_DEVICE(USB_VENDOR_ID_ION, ION_DEVICE_ID_PLUS_PWR_PCI) },
      { USB_DEVICE(USB_VENDOR_ID_ION, ION_DEVICE_ID_TI_EDGEPORT_2) },
      { USB_DEVICE(USB_VENDOR_ID_ION, ION_DEVICE_ID_TI_EDGEPORT_2C) },
      { USB_DEVICE(USB_VENDOR_ID_ION, ION_DEVICE_ID_TI_EDGEPORT_2I) },
      { USB_DEVICE(USB_VENDOR_ID_ION, ION_DEVICE_ID_TI_EDGEPORT_421) },
      { USB_DEVICE(USB_VENDOR_ID_ION, ION_DEVICE_ID_TI_EDGEPORT_21) },
      { USB_DEVICE(USB_VENDOR_ID_ION, ION_DEVICE_ID_TI_EDGEPORT_42) },
      { USB_DEVICE(USB_VENDOR_ID_ION, ION_DEVICE_ID_TI_EDGEPORT_4) },
      { USB_DEVICE(USB_VENDOR_ID_ION, ION_DEVICE_ID_TI_EDGEPORT_4I) },
      { USB_DEVICE(USB_VENDOR_ID_ION, ION_DEVICE_ID_TI_EDGEPORT_22I) },
      { USB_DEVICE(USB_VENDOR_ID_ION, ION_DEVICE_ID_TI_EDGEPORT_221C) },
      { USB_DEVICE(USB_VENDOR_ID_ION, ION_DEVICE_ID_TI_EDGEPORT_22C) },
      { USB_DEVICE(USB_VENDOR_ID_ION, ION_DEVICE_ID_TI_EDGEPORT_21C) },
      { USB_DEVICE(USB_VENDOR_ID_ION, ION_DEVICE_ID_TI_EDGEPORT_4S) },
      { USB_DEVICE(USB_VENDOR_ID_ION, ION_DEVICE_ID_TI_EDGEPORT_8) },
      { USB_DEVICE(USB_VENDOR_ID_ION, ION_DEVICE_ID_TI_EDGEPORT_8S) },
      { USB_DEVICE(USB_VENDOR_ID_ION, ION_DEVICE_ID_TI_EDGEPORT_416) },
      { USB_DEVICE(USB_VENDOR_ID_ION, ION_DEVICE_ID_TI_EDGEPORT_416B) },
      { }
};

MODULE_DEVICE_TABLE (usb, id_table_combined);

static struct usb_driver io_driver = {
      .name =           "io_ti",
      .probe =    usb_serial_probe,
      .disconnect =     usb_serial_disconnect,
      .id_table = id_table_combined,
      .no_dynamic_id =  1,
};


static struct EDGE_FIRMWARE_VERSION_INFO OperationalCodeImageVersion;

static int debug;

static int TIStayInBootMode = 0;
static int low_latency = EDGE_LOW_LATENCY;
static int closing_wait = EDGE_CLOSING_WAIT;
static int ignore_cpu_rev = 0;
static int default_uart_mode = 0;   /* RS232 */


static void edge_tty_recv(struct device *dev, struct tty_struct *tty, unsigned char *data, int length);

static void stop_read(struct edgeport_port *edge_port);
static int restart_read(struct edgeport_port *edge_port);

static void edge_set_termios (struct usb_serial_port *port, struct ktermios *old_termios);
static void edge_send(struct usb_serial_port *port);

/* sysfs attributes */
static int edge_create_sysfs_attrs(struct usb_serial_port *port);
static int edge_remove_sysfs_attrs(struct usb_serial_port *port);

/* circular buffer */
static struct edge_buf *edge_buf_alloc(unsigned int size);
static void edge_buf_free(struct edge_buf *eb);
static void edge_buf_clear(struct edge_buf *eb);
static unsigned int edge_buf_data_avail(struct edge_buf *eb);
static unsigned int edge_buf_space_avail(struct edge_buf *eb);
static unsigned int edge_buf_put(struct edge_buf *eb, const char *buf,
      unsigned int count);
static unsigned int edge_buf_get(struct edge_buf *eb, char *buf,
      unsigned int count);


static int TIReadVendorRequestSync (struct usb_device *dev,
                        __u8        request,
                        __u16       value,
                        __u16       index,
                        u8          *data,
                        int         size)
{
      int status;

      status = usb_control_msg (dev,
                        usb_rcvctrlpipe(dev, 0),
                        request,
                        (USB_TYPE_VENDOR | 
                         USB_RECIP_DEVICE | 
                         USB_DIR_IN),
                        value,
                        index,
                        data,
                        size,
                        1000);
      if (status < 0)
            return status;
      if (status != size) {
            dbg ("%s - wanted to write %d, but only wrote %d",
                 __FUNCTION__, size, status);
            return -ECOMM;
      }
      return 0;
}

static int TISendVendorRequestSync (struct usb_device *dev,
                        __u8        request,
                        __u16       value,
                        __u16       index,
                        u8          *data,
                        int         size)
{
      int status;

      status = usb_control_msg (dev,
                        usb_sndctrlpipe(dev, 0),
                        request,
                        (USB_TYPE_VENDOR | 
                         USB_RECIP_DEVICE | 
                         USB_DIR_OUT),
                        value,
                        index,
                        data,
                        size,
                        1000);
      if (status < 0)
            return status;
      if (status != size) {
            dbg ("%s - wanted to write %d, but only wrote %d",
                 __FUNCTION__, size, status);
            return -ECOMM;
      }
      return 0;
}

static int TIWriteCommandSync (struct usb_device *dev, __u8 command,
                        __u8 moduleid, __u16 value, u8 *data,
                        int size)
{
      return TISendVendorRequestSync (dev,
                                command,              // Request
                                value,                // wValue 
                                moduleid,             // wIndex
                                data,                       // TransferBuffer
                                size);                // TransferBufferLength

}

/* clear tx/rx buffers and fifo in TI UMP */
static int TIPurgeDataSync (struct usb_serial_port *port, __u16 mask)
{
      int port_number = port->number - port->serial->minor;

      dbg ("%s - port %d, mask %x", __FUNCTION__, port_number, mask);

      return TIWriteCommandSync (port->serial->dev,
                              UMPC_PURGE_PORT,
                              (__u8)(UMPM_UART1_PORT + port_number),
                              mask,
                              NULL,
                              0);
}

/**
 * TIReadDownloadMemory - Read edgeport memory from TI chip
 * @dev: usb device pointer
 * @start_address: Device CPU address at which to read
 * @length: Length of above data
 * @address_type: Can read both XDATA and I2C
 * @buffer: pointer to input data buffer
 */
static int TIReadDownloadMemory(struct usb_device *dev, int start_address,
                        int length, __u8 address_type, __u8 *buffer)
{
      int status = 0;
      __u8 read_length;
      __be16 be_start_address;
      
      dbg ("%s - @ %x for %d", __FUNCTION__, start_address, length);

      /* Read in blocks of 64 bytes
       * (TI firmware can't handle more than 64 byte reads)
       */
      while (length) {
            if (length > 64)
                  read_length= 64;
            else
                  read_length = (__u8)length;

            if (read_length > 1) {
                  dbg ("%s - @ %x for %d", __FUNCTION__, 
                       start_address, read_length);
            }
            be_start_address = cpu_to_be16 (start_address);
            status = TIReadVendorRequestSync (dev,
                                      UMPC_MEMORY_READ,     // Request
                                      (__u16)address_type,  // wValue (Address type)
                                      (__force __u16)be_start_address,  // wIndex (Address to read)
                                      buffer,         // TransferBuffer
                                      read_length);   // TransferBufferLength

            if (status) {
                  dbg ("%s - ERROR %x", __FUNCTION__, status);
                  return status;
            }

            if (read_length > 1) {
                  usb_serial_debug_data(debug, &dev->dev, __FUNCTION__,
                                    read_length, buffer);
            }

            /* Update pointers/length */
            start_address += read_length;
            buffer += read_length;
            length -= read_length;
      }
      
      return status;
}

static int TIReadRam (struct usb_device *dev, int start_address, int length, __u8 *buffer)
{
      return TIReadDownloadMemory (dev,
                             start_address,
                             length,
                             DTK_ADDR_SPACE_XDATA,
                             buffer);
}

/* Read edgeport memory to a given block */
static int TIReadBootMemory (struct edgeport_serial *serial, int start_address, int length, __u8 * buffer)
{
      int status = 0;
      int i;

      for (i=0; i< length; i++) {
            status = TIReadVendorRequestSync (serial->serial->dev,
                              UMPC_MEMORY_READ,       // Request
                              serial->TI_I2C_Type,          // wValue (Address type)
                              (__u16)(start_address+i),     // wIndex
                              &buffer[i],             // TransferBuffer
                              0x01);                        // TransferBufferLength
            if (status) {
                  dbg ("%s - ERROR %x", __FUNCTION__, status);
                  return status;
            }
      }

      dbg ("%s - start_address = %x, length = %d", __FUNCTION__, start_address, length);
      usb_serial_debug_data(debug, &serial->serial->dev->dev, __FUNCTION__, length, buffer);

      serial->TiReadI2C = 1;

      return status;
}

/* Write given block to TI EPROM memory */
static int TIWriteBootMemory (struct edgeport_serial *serial, int start_address, int length, __u8 *buffer)
{
      int status = 0;
      int i;
      __u8 temp;

      /* Must do a read before write */
      if (!serial->TiReadI2C) {
            status = TIReadBootMemory(serial, 0, 1, &temp);
            if (status)
                  return status;
      }

      for (i=0; i < length; ++i) {
            status = TISendVendorRequestSync (serial->serial->dev,
                                    UMPC_MEMORY_WRITE,            // Request
                                    buffer[i],              // wValue
                                    (__u16)(i+start_address),     // wIndex
                                    NULL,                   // TransferBuffer
                                    0);                     // TransferBufferLength
            if (status)
                  return status;
      }

      dbg ("%s - start_sddr = %x, length = %d", __FUNCTION__, start_address, length);
      usb_serial_debug_data(debug, &serial->serial->dev->dev, __FUNCTION__, length, buffer);

      return status;
}


/* Write edgeport I2C memory to TI chip   */
static int TIWriteDownloadI2C (struct edgeport_serial *serial, int start_address, int length, __u8 address_type, __u8 *buffer)
{
      int status = 0;
      int write_length;
      __be16 be_start_address;

      /* We can only send a maximum of 1 aligned byte page at a time */
      
      /* calulate the number of bytes left in the first page */
      write_length = EPROM_PAGE_SIZE - (start_address & (EPROM_PAGE_SIZE - 1));

      if (write_length > length)
            write_length = length;

      dbg ("%s - BytesInFirstPage Addr = %x, length = %d", __FUNCTION__, start_address, write_length);
      usb_serial_debug_data(debug, &serial->serial->dev->dev, __FUNCTION__, write_length, buffer);

      /* Write first page */
      be_start_address = cpu_to_be16 (start_address);
      status = TISendVendorRequestSync (serial->serial->dev,
                              UMPC_MEMORY_WRITE,      // Request
                              (__u16)address_type,    // wValue
                              (__force __u16)be_start_address,    // wIndex
                              buffer,                 // TransferBuffer
                              write_length);
      if (status) {
            dbg ("%s - ERROR %d", __FUNCTION__, status);
            return status;
      }

      length            -= write_length;
      start_address     += write_length;
      buffer            += write_length;

      /* We should be aligned now -- can write max page size bytes at a time */
      while (length) {
            if (length > EPROM_PAGE_SIZE)
                  write_length = EPROM_PAGE_SIZE;
            else
                  write_length = length;

            dbg ("%s - Page Write Addr = %x, length = %d", __FUNCTION__, start_address, write_length);
            usb_serial_debug_data(debug, &serial->serial->dev->dev, __FUNCTION__, write_length, buffer);

            /* Write next page */
            be_start_address = cpu_to_be16 (start_address);
            status = TISendVendorRequestSync (serial->serial->dev,
                                    UMPC_MEMORY_WRITE,      // Request
                                    (__u16)address_type,    // wValue
                                    (__force __u16)be_start_address,    // wIndex
                                    buffer,                 // TransferBuffer
                                    write_length);          // TransferBufferLength
            if (status) {
                  dev_err (&serial->serial->dev->dev, "%s - ERROR %d\n", __FUNCTION__, status);
                  return status;
            }
            
            length            -= write_length;
            start_address     += write_length;
            buffer            += write_length;
      }
      return status;
}

/* Examine the UMP DMA registers and LSR
 * 
 * Check the MSBit of the X and Y DMA byte count registers.
 * A zero in this bit indicates that the TX DMA buffers are empty
 * then check the TX Empty bit in the UART.
 */
static int TIIsTxActive (struct edgeport_port *port)
{
      int status;
      struct out_endpoint_desc_block *oedb;
      __u8 *lsr;
      int bytes_left = 0;

      oedb = kmalloc (sizeof (* oedb), GFP_KERNEL);
      if (!oedb) {
            dev_err (&port->port->dev, "%s - out of memory\n", __FUNCTION__);
            return -ENOMEM;
      }

      lsr = kmalloc (1, GFP_KERNEL);      /* Sigh, that's right, just one byte,
                                 as not all platforms can do DMA
                                 from stack */
      if (!lsr) {
            kfree(oedb);
            return -ENOMEM;
      }
      /* Read the DMA Count Registers */
      status = TIReadRam (port->port->serial->dev,
                      port->dma_address,
                      sizeof( *oedb),
                      (void *)oedb);

      if (status)
            goto exit_is_tx_active;

      dbg ("%s - XByteCount    0x%X", __FUNCTION__, oedb->XByteCount);

      /* and the LSR */
      status = TIReadRam (port->port->serial->dev, 
                      port->uart_base + UMPMEM_OFFS_UART_LSR,
                      1,
                      lsr);

      if (status)
            goto exit_is_tx_active;
      dbg ("%s - LSR = 0x%X", __FUNCTION__, *lsr);
      
      /* If either buffer has data or we are transmitting then return TRUE */
      if ((oedb->XByteCount & 0x80 ) != 0 )
            bytes_left += 64;

      if ((*lsr & UMP_UART_LSR_TX_MASK ) == 0 )
            bytes_left += 1;

      /* We return Not Active if we get any kind of error */
exit_is_tx_active:
      dbg ("%s - return %d", __FUNCTION__, bytes_left );

      kfree(lsr);
      kfree(oedb);
      return bytes_left;
}

static void TIChasePort(struct edgeport_port *port, unsigned long timeout, int flush)
{
      int baud_rate;
      struct tty_struct *tty = port->port->tty;
      wait_queue_t wait;
      unsigned long flags;

      if (!timeout)
            timeout = (HZ*EDGE_CLOSING_WAIT)/100;

      /* wait for data to drain from the buffer */
      spin_lock_irqsave(&port->ep_lock, flags);
      init_waitqueue_entry(&wait, current);
      add_wait_queue(&tty->write_wait, &wait);
      for (;;) {
            set_current_state(TASK_INTERRUPTIBLE);
            if (edge_buf_data_avail(port->ep_out_buf) == 0
            || timeout == 0 || signal_pending(current)
            || !usb_get_intfdata(port->port->serial->interface))  /* disconnect */
                  break;
            spin_unlock_irqrestore(&port->ep_lock, flags);
            timeout = schedule_timeout(timeout);
            spin_lock_irqsave(&port->ep_lock, flags);
      }
      set_current_state(TASK_RUNNING);
      remove_wait_queue(&tty->write_wait, &wait);
      if (flush)
            edge_buf_clear(port->ep_out_buf);
      spin_unlock_irqrestore(&port->ep_lock, flags);

      /* wait for data to drain from the device */
      timeout += jiffies;
      while ((long)(jiffies - timeout) < 0 && !signal_pending(current)
      && usb_get_intfdata(port->port->serial->interface)) {  /* not disconnected */
            if (!TIIsTxActive(port))
                  break;
            msleep(10);
      }

      /* disconnected */
      if (!usb_get_intfdata(port->port->serial->interface))
            return;

      /* wait one more character time, based on baud rate */
      /* (TIIsTxActive doesn't seem to wait for the last byte) */
      if ((baud_rate=port->baud_rate) == 0)
            baud_rate = 50;
      msleep(max(1,(10000+baud_rate-1)/baud_rate));
}

static int TIChooseConfiguration (struct usb_device *dev)
{
      // There may be multiple configurations on this device, in which case
      // we would need to read and parse all of them to find out which one
      // we want. However, we just support one config at this point,
      // configuration # 1, which is Config Descriptor 0.

      dbg ("%s - Number of Interfaces = %d", __FUNCTION__, dev->config->desc.bNumInterfaces);
      dbg ("%s - MAX Power            = %d", __FUNCTION__, dev->config->desc.bMaxPower*2);

      if (dev->config->desc.bNumInterfaces != 1) {
            dev_err (&dev->dev, "%s - bNumInterfaces is not 1, ERROR!\n", __FUNCTION__);
            return -ENODEV;
      }

      return 0;
}

static int TIReadRom (struct edgeport_serial *serial, int start_address, int length, __u8 *buffer)
{
      int status;

      if (serial->product_info.TiMode == TI_MODE_DOWNLOAD) {
            status = TIReadDownloadMemory (serial->serial->dev,
                                     start_address,
                                     length,
                                     serial->TI_I2C_Type,
                                     buffer);
      } else {
            status = TIReadBootMemory (serial,
                                 start_address,
                                 length,
                                 buffer);
      }

      return status;
}

static int TIWriteRom (struct edgeport_serial *serial, int start_address, int length, __u8 *buffer)
{
      if (serial->product_info.TiMode == TI_MODE_BOOT)
            return TIWriteBootMemory (serial,
                                start_address,
                                length,
                                buffer);

      if (serial->product_info.TiMode == TI_MODE_DOWNLOAD)
            return TIWriteDownloadI2C (serial,
                                 start_address,
                                 length,
                                 serial->TI_I2C_Type,
                                 buffer);

      return -EINVAL;
}



/* Read a descriptor header from I2C based on type */
static int TIGetDescriptorAddress (struct edgeport_serial *serial, int desc_type, struct ti_i2c_desc *rom_desc)
{
      int start_address;
      int status;

      /* Search for requested descriptor in I2C */
      start_address = 2;
      do {
            status = TIReadRom (serial,
                           start_address,
                           sizeof(struct ti_i2c_desc),
                           (__u8 *)rom_desc );
            if (status)
                  return 0;

            if (rom_desc->Type == desc_type)
                  return start_address;

            start_address = start_address + sizeof(struct ti_i2c_desc) +  rom_desc->Size;

      } while ((start_address < TI_MAX_I2C_SIZE) && rom_desc->Type);
      
      return 0;
}

/* Validate descriptor checksum */
static int ValidChecksum(struct ti_i2c_desc *rom_desc, __u8 *buffer)
{
      __u16 i;
      __u8 cs = 0;

      for (i=0; i < rom_desc->Size; i++) {
            cs = (__u8)(cs + buffer[i]);
      }
      if (cs != rom_desc->CheckSum) {
            dbg ("%s - Mismatch %x - %x", __FUNCTION__, rom_desc->CheckSum, cs);
            return -EINVAL;
      }
      return 0;
}

/* Make sure that the I2C image is good */
static int TiValidateI2cImage (struct edgeport_serial *serial)
{
      struct device *dev = &serial->serial->dev->dev;
      int status = 0;
      struct ti_i2c_desc *rom_desc;
      int start_address = 2;
      __u8 *buffer;
      __u16 ttype;

      rom_desc = kmalloc (sizeof (*rom_desc), GFP_KERNEL);
      if (!rom_desc) {
            dev_err (dev, "%s - out of memory\n", __FUNCTION__);
            return -ENOMEM;
      }
      buffer = kmalloc (TI_MAX_I2C_SIZE, GFP_KERNEL);
      if (!buffer) {
            dev_err (dev, "%s - out of memory when allocating buffer\n", __FUNCTION__);
            kfree (rom_desc);
            return -ENOMEM;
      }

      // Read the first byte (Signature0) must be 0x52 or 0x10
      status = TIReadRom (serial, 0, 1, buffer);
      if (status)
            goto ExitTiValidateI2cImage; 

      if (*buffer != UMP5152 && *buffer != UMP3410) {
            dev_err (dev, "%s - invalid buffer signature\n", __FUNCTION__);
            status = -ENODEV;
            goto ExitTiValidateI2cImage;
      }

      do {
            // Validate the I2C
            status = TIReadRom (serial,
                        start_address,
                        sizeof(struct ti_i2c_desc),
                        (__u8 *)rom_desc);
            if (status)
                  break;

            if ((start_address + sizeof(struct ti_i2c_desc) + rom_desc->Size) > TI_MAX_I2C_SIZE) {
                  status = -ENODEV;
                  dbg ("%s - structure too big, erroring out.", __FUNCTION__);
                  break;
            }

            dbg ("%s Type = 0x%x", __FUNCTION__, rom_desc->Type);

            // Skip type 2 record
            ttype = rom_desc->Type & 0x0f;
            if ( ttype != I2C_DESC_TYPE_FIRMWARE_BASIC
                  && ttype != I2C_DESC_TYPE_FIRMWARE_AUTO ) {
                  // Read the descriptor data
                  status = TIReadRom(serial,
                                    start_address+sizeof(struct ti_i2c_desc),
                                    rom_desc->Size,
                                    buffer);
                  if (status)
                        break;

                  status = ValidChecksum(rom_desc, buffer);
                  if (status)
                        break;
            }
            start_address = start_address + sizeof(struct ti_i2c_desc) + rom_desc->Size;

      } while ((rom_desc->Type != I2C_DESC_TYPE_ION) && (start_address < TI_MAX_I2C_SIZE));

      if ((rom_desc->Type != I2C_DESC_TYPE_ION) || (start_address > TI_MAX_I2C_SIZE))
            status = -ENODEV;

ExitTiValidateI2cImage: 
      kfree (buffer);
      kfree (rom_desc);
      return status;
}

static int TIReadManufDescriptor (struct edgeport_serial *serial, __u8 *buffer)
{
      int status;
      int start_address;
      struct ti_i2c_desc *rom_desc;
      struct edge_ti_manuf_descriptor *desc;

      rom_desc = kmalloc (sizeof (*rom_desc), GFP_KERNEL);
      if (!rom_desc) {
            dev_err (&serial->serial->dev->dev, "%s - out of memory\n", __FUNCTION__);
            return -ENOMEM;
      }
      start_address = TIGetDescriptorAddress (serial, I2C_DESC_TYPE_ION, rom_desc);

      if (!start_address) {
            dbg ("%s - Edge Descriptor not found in I2C", __FUNCTION__);
            status = -ENODEV;
            goto exit;
      }

      // Read the descriptor data
      status = TIReadRom (serial,
                        start_address+sizeof(struct ti_i2c_desc),
                        rom_desc->Size,
                        buffer);
      if (status)
            goto exit;
      
      status = ValidChecksum(rom_desc, buffer);
      
      desc = (struct edge_ti_manuf_descriptor *)buffer;
      dbg ( "%s - IonConfig      0x%x", __FUNCTION__, desc->IonConfig   );
      dbg ( "%s - Version          %d", __FUNCTION__, desc->Version           );
      dbg ( "%s - Cpu/Board      0x%x", __FUNCTION__, desc->CpuRev_BoardRev   );
      dbg ( "%s - NumPorts         %d", __FUNCTION__, desc->NumPorts    );    
      dbg ( "%s - NumVirtualPorts  %d", __FUNCTION__, desc->NumVirtualPorts   );    
      dbg ( "%s - TotalPorts       %d", __FUNCTION__, desc->TotalPorts        );    

exit:
      kfree (rom_desc);
      return status;
}

/* Build firmware header used for firmware update */
static int BuildI2CFirmwareHeader (__u8 *header, struct device *dev)
{
      __u8 *buffer;
      int buffer_size;
      int i;
      __u8 cs = 0;
      struct ti_i2c_desc *i2c_header;
      struct ti_i2c_image_header *img_header;
      struct ti_i2c_firmware_rec *firmware_rec;

      // In order to update the I2C firmware we must change the type 2 record to type 0xF2.
      // This will force the UMP to come up in Boot Mode.  Then while in boot mode, the driver 
      // will download the latest firmware (padded to 15.5k) into the UMP ram. 
      // And finally when the device comes back up in download mode the driver will cause 
      // the new firmware to be copied from the UMP Ram to I2C and the firmware will update
      // the record type from 0xf2 to 0x02.
      
      // Allocate a 15.5k buffer + 2 bytes for version number (Firmware Record)
      buffer_size = (((1024 * 16) - 512 )+ sizeof(struct ti_i2c_firmware_rec));

      buffer = kmalloc (buffer_size, GFP_KERNEL);
      if (!buffer) {
            dev_err (dev, "%s - out of memory\n", __FUNCTION__);
            return -ENOMEM;
      }
      
      // Set entire image of 0xffs
      memset (buffer, 0xff, buffer_size);

      // Copy version number into firmware record
      firmware_rec = (struct ti_i2c_firmware_rec *)buffer;

      firmware_rec->Ver_Major = OperationalCodeImageVersion.MajorVersion;
      firmware_rec->Ver_Minor = OperationalCodeImageVersion.MinorVersion;

      // Pointer to fw_down memory image
      img_header = (struct ti_i2c_image_header *)&PagableOperationalCodeImage[0];

      memcpy (buffer + sizeof(struct ti_i2c_firmware_rec),
            &PagableOperationalCodeImage[sizeof(struct ti_i2c_image_header)],
            le16_to_cpu(img_header->Length));

      for (i=0; i < buffer_size; i++) {
            cs = (__u8)(cs + buffer[i]);
      }

      kfree (buffer);

      // Build new header
      i2c_header =  (struct ti_i2c_desc *)header;
      firmware_rec =  (struct ti_i2c_firmware_rec*)i2c_header->Data;
      
      i2c_header->Type  = I2C_DESC_TYPE_FIRMWARE_BLANK;
      i2c_header->Size  = (__u16)buffer_size;
      i2c_header->CheckSum    = cs;
      firmware_rec->Ver_Major = OperationalCodeImageVersion.MajorVersion;
      firmware_rec->Ver_Minor = OperationalCodeImageVersion.MinorVersion;

      return 0;
}

/* Try to figure out what type of I2c we have */
static int TIGetI2cTypeInBootMode (struct edgeport_serial *serial)
{
      int status;
      __u8 data;
            
      // Try to read type 2
      status = TIReadVendorRequestSync (serial->serial->dev,
                              UMPC_MEMORY_READ,       // Request
                              DTK_ADDR_SPACE_I2C_TYPE_II,   // wValue (Address type)
                              0,                      // wIndex
                              &data,                        // TransferBuffer
                              0x01);                        // TransferBufferLength
      if (status)
            dbg ("%s - read 2 status error = %d", __FUNCTION__, status);
      else
            dbg ("%s - read 2 data = 0x%x", __FUNCTION__, data);
      if ((!status) && (data == UMP5152 || data == UMP3410)) {
            dbg ("%s - ROM_TYPE_II", __FUNCTION__);
            serial->TI_I2C_Type = DTK_ADDR_SPACE_I2C_TYPE_II;
            return 0;
      }

      // Try to read type 3
      status = TIReadVendorRequestSync (serial->serial->dev,
                              UMPC_MEMORY_READ,       // Request
                              DTK_ADDR_SPACE_I2C_TYPE_III,  // wValue (Address type)
                              0,                      // wIndex
                              &data,                        // TransferBuffer
                              0x01);                        // TransferBufferLength
      if (status)
            dbg ("%s - read 3 status error = %d", __FUNCTION__, status);
      else
            dbg ("%s - read 2 data = 0x%x", __FUNCTION__, data);
      if ((!status) && (data == UMP5152 || data == UMP3410)) {
            dbg ("%s - ROM_TYPE_III", __FUNCTION__);
            serial->TI_I2C_Type = DTK_ADDR_SPACE_I2C_TYPE_III;
            return 0;
      }

      dbg ("%s - Unknown", __FUNCTION__);
      serial->TI_I2C_Type = DTK_ADDR_SPACE_I2C_TYPE_II;
      return -ENODEV;
}

static int TISendBulkTransferSync (struct usb_serial *serial, void *buffer, int length, int *num_sent)
{
      int status;

      status = usb_bulk_msg (serial->dev,
                        usb_sndbulkpipe(serial->dev,
                                    serial->port[0]->bulk_out_endpointAddress),
                        buffer,
                        length,
                        num_sent,
                        1000);
      return status;
}

/* Download given firmware image to the device (IN BOOT MODE) */
static int TIDownloadCodeImage (struct edgeport_serial *serial, __u8 *image, int image_length)
{
      int status = 0;
      int pos;
      int transfer;
      int done;

      // Transfer firmware image
      for (pos = 0; pos < image_length; ) {
            // Read the next buffer from file
            transfer = image_length - pos;
            if (transfer > EDGE_FW_BULK_MAX_PACKET_SIZE)
                  transfer = EDGE_FW_BULK_MAX_PACKET_SIZE;

            // Transfer data
            status = TISendBulkTransferSync (serial->serial, &image[pos], transfer, &done);
            if (status)
                  break;
            // Advance buffer pointer
            pos += done;
      }

      return status;
}

// FIXME!!!
static int TIConfigureBootDevice (struct usb_device *dev)
{
      return 0;
}

/**
 * DownloadTIFirmware - Download run-time operating firmware to the TI5052
 * 
 * This routine downloads the main operating code into the TI5052, using the
 * boot code already burned into E2PROM or ROM.
 */
static int TIDownloadFirmware (struct edgeport_serial *serial)
{
      struct device *dev = &serial->serial->dev->dev;
      int status = 0;
      int start_address;
      struct edge_ti_manuf_descriptor *ti_manuf_desc;
      struct usb_interface_descriptor *interface;
      int download_cur_ver;
      int download_new_ver;

      /* This routine is entered by both the BOOT mode and the Download mode
       * We can determine which code is running by the reading the config
       * descriptor and if we have only one bulk pipe it is in boot mode
       */
      serial->product_info.hardware_type = HARDWARE_TYPE_TIUMP;

      /* Default to type 2 i2c */
      serial->TI_I2C_Type = DTK_ADDR_SPACE_I2C_TYPE_II;

      status = TIChooseConfiguration (serial->serial->dev);
      if (status)
            return status;

      interface = &serial->serial->interface->cur_altsetting->desc;
      if (!interface) {
            dev_err (dev, "%s - no interface set, error!\n", __FUNCTION__);
            return -ENODEV;
      }

      // Setup initial mode -- the default mode 0 is TI_MODE_CONFIGURING
      // if we have more than one endpoint we are definitely in download mode
      if (interface->bNumEndpoints > 1)
            serial->product_info.TiMode = TI_MODE_DOWNLOAD;
      else
            // Otherwise we will remain in configuring mode
            serial->product_info.TiMode = TI_MODE_CONFIGURING;

      // Save Download Version Number
      OperationalCodeImageVersion.MajorVersion = PagableOperationalCodeImageVersion.MajorVersion;
      OperationalCodeImageVersion.MinorVersion = PagableOperationalCodeImageVersion.MinorVersion;
      OperationalCodeImageVersion.BuildNumber    = PagableOperationalCodeImageVersion.BuildNumber;

      /********************************************************************/
      /* Download Mode */
      /********************************************************************/
      if (serial->product_info.TiMode == TI_MODE_DOWNLOAD) {
            struct ti_i2c_desc *rom_desc;

            dbg ("%s - <<<<<<<<<<<<<<<RUNNING IN DOWNLOAD MODE>>>>>>>>>>", __FUNCTION__);

            status = TiValidateI2cImage (serial);
            if (status) {
                  dbg ("%s - <<<<<<<<<<<<<<<DOWNLOAD MODE -- BAD I2C >>>>>>>>>>",
                       __FUNCTION__);
                  return status;
            }
            
            /* Validate Hardware version number
             * Read Manufacturing Descriptor from TI Based Edgeport
             */
            ti_manuf_desc = kmalloc (sizeof (*ti_manuf_desc), GFP_KERNEL);
            if (!ti_manuf_desc) {
                  dev_err (dev, "%s - out of memory.\n", __FUNCTION__);
                  return -ENOMEM;
            }
            status = TIReadManufDescriptor (serial, (__u8 *)ti_manuf_desc);
            if (status) {
                  kfree (ti_manuf_desc);
                  return status;
            }

            // Check version number of ION descriptor
            if (!ignore_cpu_rev && TI_GET_CPU_REVISION(ti_manuf_desc->CpuRev_BoardRev) < 2) {
                  dbg ( "%s - Wrong CPU Rev %d (Must be 2)", __FUNCTION__, 
                       TI_GET_CPU_REVISION(ti_manuf_desc->CpuRev_BoardRev));
                  kfree (ti_manuf_desc);
                  return -EINVAL;
            }

            rom_desc = kmalloc (sizeof (*rom_desc), GFP_KERNEL);
            if (!rom_desc) {
                  dev_err (dev, "%s - out of memory.\n", __FUNCTION__);
                  kfree (ti_manuf_desc);
                  return -ENOMEM;
            }

            // Search for type 2 record (firmware record)
            if ((start_address = TIGetDescriptorAddress (serial, I2C_DESC_TYPE_FIRMWARE_BASIC, rom_desc)) != 0) {
                  struct ti_i2c_firmware_rec *firmware_version;
                  __u8 record;

                  dbg ("%s - Found Type FIRMWARE (Type 2) record", __FUNCTION__);

                  firmware_version = kmalloc (sizeof (*firmware_version), GFP_KERNEL);
                  if (!firmware_version) {
                        dev_err (dev, "%s - out of memory.\n", __FUNCTION__);
                        kfree (rom_desc);
                        kfree (ti_manuf_desc);
                        return -ENOMEM;
                  }

                  // Validate version number                      
                  // Read the descriptor data
                  status = TIReadRom (serial,
                              start_address+sizeof(struct ti_i2c_desc),
                              sizeof(struct ti_i2c_firmware_rec),
                              (__u8 *)firmware_version);
                  if (status) {
                        kfree (firmware_version);
                        kfree (rom_desc);
                        kfree (ti_manuf_desc);
                        return status;
                  }

                  // Check version number of download with current version in I2c
                  download_cur_ver = (firmware_version->Ver_Major << 8) + 
                                 (firmware_version->Ver_Minor);
                  download_new_ver = (OperationalCodeImageVersion.MajorVersion << 8) +
                                 (OperationalCodeImageVersion.MinorVersion);

                  dbg ("%s - >>>Firmware Versions Device %d.%d  Driver %d.%d",
                       __FUNCTION__,
                       firmware_version->Ver_Major,
                       firmware_version->Ver_Minor,
                       OperationalCodeImageVersion.MajorVersion,
                       OperationalCodeImageVersion.MinorVersion);

                  // Check if we have an old version in the I2C and update if necessary
                  if (download_cur_ver != download_new_ver) {
                        dbg ("%s - Update I2C Download from %d.%d to %d.%d",
                             __FUNCTION__,
                             firmware_version->Ver_Major,
                             firmware_version->Ver_Minor,
                             OperationalCodeImageVersion.MajorVersion,
                             OperationalCodeImageVersion.MinorVersion);

                        // In order to update the I2C firmware we must change the type 2 record to type 0xF2.
                        // This will force the UMP to come up in Boot Mode.  Then while in boot mode, the driver 
                        // will download the latest firmware (padded to 15.5k) into the UMP ram. 
                        // And finally when the device comes back up in download mode the driver will cause 
                        // the new firmware to be copied from the UMP Ram to I2C and the firmware will update
                        // the record type from 0xf2 to 0x02.

                        record = I2C_DESC_TYPE_FIRMWARE_BLANK;

                        // Change the I2C Firmware record type to 0xf2 to trigger an update
                        status = TIWriteRom (serial,
                                          start_address,
                                          sizeof(record),
                                          &record);
                        if (status) {
                              kfree (firmware_version);
                              kfree (rom_desc);
                              kfree (ti_manuf_desc);
                              return status;
                        }

                        // verify the write -- must do this in order for write to 
                        // complete before we do the hardware reset
                        status = TIReadRom (serial,
                                          start_address,
                                          sizeof(record),
                                          &record);

                        if (status) {
                              kfree (firmware_version);
                              kfree (rom_desc);
                              kfree (ti_manuf_desc);
                              return status;
                        }

                        if (record != I2C_DESC_TYPE_FIRMWARE_BLANK) {
                              dev_err (dev, "%s - error resetting device\n", __FUNCTION__);
                              kfree (firmware_version);
                              kfree (rom_desc);
                              kfree (ti_manuf_desc);
                              return -ENODEV;
                        }

                        dbg ("%s - HARDWARE RESET", __FUNCTION__);

                        // Reset UMP -- Back to BOOT MODE
                        status = TISendVendorRequestSync (serial->serial->dev,
                                                UMPC_HARDWARE_RESET,    // Request
                                                0,                // wValue
                                                0,                // wIndex
                                                NULL,             // TransferBuffer
                                                0);               // TransferBufferLength

                        dbg ( "%s - HARDWARE RESET return %d", __FUNCTION__, status);

                        /* return an error on purpose. */
                        kfree (firmware_version);
                        kfree (rom_desc);
                        kfree (ti_manuf_desc);
                        return -ENODEV;
                  }
                  kfree (firmware_version);
            }
            // Search for type 0xF2 record (firmware blank record)
            else if ((start_address = TIGetDescriptorAddress (serial, I2C_DESC_TYPE_FIRMWARE_BLANK, rom_desc)) != 0) {
                  #define HEADER_SIZE     (sizeof(struct ti_i2c_desc) + sizeof(struct ti_i2c_firmware_rec))
                  __u8 *header;
                  __u8 *vheader;

                  header  = kmalloc (HEADER_SIZE, GFP_KERNEL);
                  if (!header) {
                        dev_err (dev, "%s - out of memory.\n", __FUNCTION__);
                        kfree (rom_desc);
                        kfree (ti_manuf_desc);
                        return -ENOMEM;
                  }
                        
                  vheader = kmalloc (HEADER_SIZE, GFP_KERNEL);
                  if (!vheader) {
                        dev_err (dev, "%s - out of memory.\n", __FUNCTION__);
                        kfree (header);
                        kfree (rom_desc);
                        kfree (ti_manuf_desc);
                        return -ENOMEM;
                  }
                  
                  dbg ("%s - Found Type BLANK FIRMWARE (Type F2) record", __FUNCTION__);

                  // In order to update the I2C firmware we must change the type 2 record to type 0xF2.
                  // This will force the UMP to come up in Boot Mode.  Then while in boot mode, the driver 
                  // will download the latest firmware (padded to 15.5k) into the UMP ram. 
                  // And finally when the device comes back up in download mode the driver will cause 
                  // the new firmware to be copied from the UMP Ram to I2C and the firmware will update
                  // the record type from 0xf2 to 0x02.
                  status = BuildI2CFirmwareHeader(header, dev);
                  if (status) {
                        kfree (vheader);
                        kfree (header);
                        kfree (rom_desc);
                        kfree (ti_manuf_desc);
                        return status;
                  }

                  // Update I2C with type 0xf2 record with correct size and checksum
                  status = TIWriteRom (serial,
                                    start_address,
                                    HEADER_SIZE,
                                    header);
                  if (status) {
                        kfree (vheader);
                        kfree (header);
                        kfree (rom_desc);
                        kfree (ti_manuf_desc);
                        return status;
                  }

                  // verify the write -- must do this in order for write to 
                  // complete before we do the hardware reset
                  status = TIReadRom (serial,
                                    start_address,
                                    HEADER_SIZE,
                                    vheader);

                  if (status) {
                        dbg ("%s - can't read header back", __FUNCTION__);
                        kfree (vheader);
                        kfree (header);
                        kfree (rom_desc);
                        kfree (ti_manuf_desc);
                        return status;
                  }
                  if (memcmp(vheader, header, HEADER_SIZE)) {
                        dbg ("%s - write download record failed", __FUNCTION__);
                        kfree (vheader);
                        kfree (header);
                        kfree (rom_desc);
                        kfree (ti_manuf_desc);
                        return status;
                  }

                  kfree (vheader);
                  kfree (header);

                  dbg ("%s - Start firmware update", __FUNCTION__);

                  // Tell firmware to copy download image into I2C 
                  status = TISendVendorRequestSync (serial->serial->dev,
                                    UMPC_COPY_DNLD_TO_I2C,  // Request
                                    0,                // wValue 
                                    0,                // wIndex
                                    NULL,             // TransferBuffer
                                    0);               // TransferBufferLength

                  dbg ("%s - Update complete 0x%x", __FUNCTION__, status);
                  if (status) {
                        dev_err (dev, "%s - UMPC_COPY_DNLD_TO_I2C failed\n", __FUNCTION__);
                        kfree (rom_desc);
                        kfree (ti_manuf_desc);
                        return status;
                  }
            }

            // The device is running the download code
            kfree (rom_desc);
            kfree (ti_manuf_desc);
            return 0;
      }

      /********************************************************************/
      /* Boot Mode */
      /********************************************************************/
      dbg ("%s - <<<<<<<<<<<<<<<RUNNING IN BOOT MODE>>>>>>>>>>>>>>>",
           __FUNCTION__);

      // Configure the TI device so we can use the BULK pipes for download
      status = TIConfigureBootDevice (serial->serial->dev);
      if (status)
            return status;

      if (le16_to_cpu(serial->serial->dev->descriptor.idVendor) != USB_VENDOR_ID_ION) {
            dbg ("%s - VID = 0x%x", __FUNCTION__,
                 le16_to_cpu(serial->serial->dev->descriptor.idVendor));
            serial->TI_I2C_Type = DTK_ADDR_SPACE_I2C_TYPE_II;
            goto StayInBootMode;
      }

      // We have an ION device (I2c Must be programmed)
      // Determine I2C image type
      if (TIGetI2cTypeInBootMode(serial)) {
            goto StayInBootMode;
      }

      // Registry variable set?
      if (TIStayInBootMode) {
            dbg ("%s - TIStayInBootMode", __FUNCTION__);
            goto StayInBootMode;
      }

      // Check for ION Vendor ID and that the I2C is valid
      if (!TiValidateI2cImage(serial)) {
            struct ti_i2c_image_header *header;
            int i;
            __u8 cs = 0;
            __u8 *buffer;
            int buffer_size;

            /* Validate Hardware version number
             * Read Manufacturing Descriptor from TI Based Edgeport
             */
            ti_manuf_desc = kmalloc (sizeof (*ti_manuf_desc), GFP_KERNEL);
            if (!ti_manuf_desc) {
                  dev_err (dev, "%s - out of memory.\n", __FUNCTION__);
                  return -ENOMEM;
            }
            status = TIReadManufDescriptor (serial, (__u8 *)ti_manuf_desc);
            if (status) {
                  kfree (ti_manuf_desc);
                  goto StayInBootMode;
            }

            // Check for version 2
            if (!ignore_cpu_rev && TI_GET_CPU_REVISION(ti_manuf_desc->CpuRev_BoardRev) < 2) {
                  dbg ("%s - Wrong CPU Rev %d (Must be 2)", __FUNCTION__,
                       TI_GET_CPU_REVISION(ti_manuf_desc->CpuRev_BoardRev));
                  kfree (ti_manuf_desc);
                  goto StayInBootMode;
            }

            kfree (ti_manuf_desc);

            // In order to update the I2C firmware we must change the type 2 record to type 0xF2.
            // This will force the UMP to come up in Boot Mode.  Then while in boot mode, the driver 
            // will download the latest firmware (padded to 15.5k) into the UMP ram. 
            // And finally when the device comes back up in download mode the driver will cause 
            // the new firmware to be copied from the UMP Ram to I2C and the firmware will update
            // the record type from 0xf2 to 0x02.
            
            /*
             * Do we really have to copy the whole firmware image,
             * or could we do this in place!
             */

            // Allocate a 15.5k buffer + 3 byte header
            buffer_size = (((1024 * 16) - 512) + sizeof(struct ti_i2c_image_header));
            buffer = kmalloc (buffer_size, GFP_KERNEL);
            if (!buffer) {
                  dev_err (dev, "%s - out of memory\n", __FUNCTION__);
                  return -ENOMEM;
            }
            
            // Initialize the buffer to 0xff (pad the buffer)
            memset (buffer, 0xff, buffer_size);

            memcpy (buffer, &PagableOperationalCodeImage[0], PagableOperationalCodeSize);

            for(i = sizeof(struct ti_i2c_image_header); i < buffer_size; i++) {
                  cs = (__u8)(cs + buffer[i]);
            }
            
            header = (struct ti_i2c_image_header *)buffer;
            
            // update length and checksum after padding
            header->Length     = cpu_to_le16((__u16)(buffer_size - sizeof(struct ti_i2c_image_header)));
            header->CheckSum = cs;

            // Download the operational code 
            dbg ("%s - Downloading operational code image (TI UMP)", __FUNCTION__);
            status = TIDownloadCodeImage (serial, buffer, buffer_size);

            kfree (buffer);

            if (status) {
                  dbg ("%s - Error downloading operational code image", __FUNCTION__);
                  return status;
            }

            // Device will reboot
            serial->product_info.TiMode = TI_MODE_TRANSITIONING;

            dbg ("%s - Download successful -- Device rebooting...", __FUNCTION__);

            /* return an error on purpose */
            return -ENODEV;
      }

StayInBootMode:
      // Eprom is invalid or blank stay in boot mode
      dbg ("%s - <<<<<<<<<<<<<<<STAYING IN BOOT MODE>>>>>>>>>>>>", __FUNCTION__);
      serial->product_info.TiMode = TI_MODE_BOOT;

      return 0;
}


static int TISetDtr (struct edgeport_port *port)
{
      int port_number = port->port->number - port->port->serial->minor;

      dbg ("%s", __FUNCTION__);
      port->shadow_mcr |= MCR_DTR;

      return TIWriteCommandSync (port->port->serial->dev,
                        UMPC_SET_CLR_DTR,
                        (__u8)(UMPM_UART1_PORT + port_number),
                        1,    /* set */
                        NULL,
                        0);
}

static int TIClearDtr (struct edgeport_port *port)
{
      int port_number = port->port->number - port->port->serial->minor;

      dbg ("%s", __FUNCTION__);
      port->shadow_mcr &= ~MCR_DTR;

      return TIWriteCommandSync (port->port->serial->dev,
                        UMPC_SET_CLR_DTR,
                        (__u8)(UMPM_UART1_PORT + port_number),
                        0,    /* clear */
                        NULL,
                        0);
}

static int TISetRts (struct edgeport_port *port)
{
      int port_number = port->port->number - port->port->serial->minor;

      dbg ("%s", __FUNCTION__);
      port->shadow_mcr |= MCR_RTS;

      return TIWriteCommandSync (port->port->serial->dev,
                        UMPC_SET_CLR_RTS,
                        (__u8)(UMPM_UART1_PORT + port_number),
                        1,    /* set */
                        NULL,
                        0);
}

static int TIClearRts (struct edgeport_port *port)
{
      int port_number = port->port->number - port->port->serial->minor;

      dbg ("%s", __FUNCTION__);
      port->shadow_mcr &= ~MCR_RTS;

      return TIWriteCommandSync (port->port->serial->dev,
                        UMPC_SET_CLR_RTS,
                        (__u8)(UMPM_UART1_PORT + port_number),
                        0,    /* clear */
                        NULL,
                        0);
}

static int TISetLoopBack (struct edgeport_port *port)
{
      int port_number = port->port->number - port->port->serial->minor;

      dbg ("%s", __FUNCTION__);

      return TIWriteCommandSync (port->port->serial->dev,
                        UMPC_SET_CLR_LOOPBACK,
                        (__u8)(UMPM_UART1_PORT + port_number),
                        1,    /* set */
                        NULL,
                        0);
}

static int TIClearLoopBack (struct edgeport_port *port)
{
      int port_number = port->port->number - port->port->serial->minor;

      dbg ("%s", __FUNCTION__);

      return TIWriteCommandSync (port->port->serial->dev,
                        UMPC_SET_CLR_LOOPBACK,
                        (__u8)(UMPM_UART1_PORT + port_number),
                        0,    /* clear */
                        NULL,
                        0);
}

static int TISetBreak (struct edgeport_port *port)
{
      int port_number = port->port->number - port->port->serial->minor;

      dbg ("%s", __FUNCTION__);

      return TIWriteCommandSync (port->port->serial->dev,
                        UMPC_SET_CLR_BREAK,
                        (__u8)(UMPM_UART1_PORT + port_number),
                        1,    /* set */
                        NULL,
                        0);
}

static int TIClearBreak (struct edgeport_port *port)
{
      int port_number = port->port->number - port->port->serial->minor;

      dbg ("%s", __FUNCTION__);

      return TIWriteCommandSync (port->port->serial->dev,
                        UMPC_SET_CLR_BREAK,
                        (__u8)(UMPM_UART1_PORT + port_number),
                        0,    /* clear */
                        NULL,
                        0);
}

static int TIRestoreMCR (struct edgeport_port *port, __u8 mcr)
{
      int status = 0;

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

      if (mcr & MCR_DTR)
            status = TISetDtr (port);
      else
            status = TIClearDtr (port);

      if (status)
            return status;

      if (mcr & MCR_RTS)
            status = TISetRts (port);
      else
            status = TIClearRts (port);

      if (status)
            return status;

      if (mcr & MCR_LOOPBACK)
            status = TISetLoopBack (port);
      else
            status = TIClearLoopBack (port);

      return status;
}



/* Convert TI LSR to standard UART flags */
static __u8 MapLineStatus (__u8 ti_lsr)
{
      __u8 lsr = 0;

#define MAP_FLAG(flagUmp, flagUart)    \
      if (ti_lsr & flagUmp) \
            lsr |= flagUart;

      MAP_FLAG(UMP_UART_LSR_OV_MASK, LSR_OVER_ERR)    /* overrun */
      MAP_FLAG(UMP_UART_LSR_PE_MASK, LSR_PAR_ERR)     /* parity error */
      MAP_FLAG(UMP_UART_LSR_FE_MASK, LSR_FRM_ERR)     /* framing error */
      MAP_FLAG(UMP_UART_LSR_BR_MASK, LSR_BREAK) /* break detected */
      MAP_FLAG(UMP_UART_LSR_RX_MASK, LSR_RX_AVAIL)    /* receive data available */
      MAP_FLAG(UMP_UART_LSR_TX_MASK, LSR_TX_EMPTY)    /* transmit holding register empty */

#undef MAP_FLAG

      return lsr;
}

static void handle_new_msr (struct edgeport_port *edge_port, __u8 msr)
{
      struct async_icount *icount;
      struct tty_struct *tty;

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

      if (msr & (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 (msr & EDGEPORT_MSR_DELTA_CTS)
                  icount->cts++;
            if (msr & EDGEPORT_MSR_DELTA_DSR)
                  icount->dsr++;
            if (msr & EDGEPORT_MSR_DELTA_CD)
                  icount->dcd++;
            if (msr & EDGEPORT_MSR_DELTA_RI)
                  icount->rng++;
            wake_up_interruptible (&edge_port->delta_msr_wait);
      }

      /* Save the new modem status */
      edge_port->shadow_msr = msr & 0xf0;

      tty = edge_port->port->tty;
      /* handle CTS flow control */
      if (tty && C_CRTSCTS(tty)) {
            if (msr & EDGEPORT_MSR_CTS) {
                  tty->hw_stopped = 0;
                  tty_wakeup(tty);
            } else {
                  tty->hw_stopped = 1;
            }
      }

      return;
}

static void handle_new_lsr (struct edgeport_port *edge_port, int lsr_data, __u8 lsr, __u8 data)
{
      struct async_icount *icount;
      __u8 new_lsr = (__u8)(lsr & (__u8)(LSR_OVER_ERR | LSR_PAR_ERR | LSR_FRM_ERR | LSR_BREAK));

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

      edge_port->shadow_lsr = lsr;

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

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

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


static void edge_interrupt_callback (struct urb *urb)
{
      struct edgeport_serial *edge_serial = (struct edgeport_serial *)urb->context;
      struct usb_serial_port *port;
      struct edgeport_port *edge_port;
      unsigned char *data = urb->transfer_buffer;
      int length = urb->actual_length;
      int port_number;
      int function;
      int retval;
      __u8 lsr;
      __u8 msr;
      int status = urb->status;

      dbg("%s", __FUNCTION__);

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

      if (!length) {
            dbg ("%s - no data in urb", __FUNCTION__);
            goto exit;
      }
            
      usb_serial_debug_data(debug, &edge_serial->serial->dev->dev, __FUNCTION__, length, data);
            
      if (length != 2) {
            dbg ("%s - expecting packet of size 2, got %d", __FUNCTION__, length);
            goto exit;
      }

      port_number = TIUMP_GET_PORT_FROM_CODE (data[0]);
      function    = TIUMP_GET_FUNC_FROM_CODE (data[0]);
      dbg ("%s - port_number %d, function %d, info 0x%x",
           __FUNCTION__, port_number, function, data[1]);
      port = edge_serial->serial->port[port_number];
      edge_port = usb_get_serial_port_data(port);
      if (!edge_port) {
            dbg ("%s - edge_port not found", __FUNCTION__);
            return;
      }
      switch (function) {
      case TIUMP_INTERRUPT_CODE_LSR:
            lsr = MapLineStatus(data[1]);
            if (lsr & UMP_UART_LSR_DATA_MASK) {
                  /* Save the LSR event for bulk read completion routine */
                  dbg ("%s - LSR Event Port %u LSR Status = %02x",
                       __FUNCTION__, port_number, lsr);
                  edge_port->lsr_event = 1;
                  edge_port->lsr_mask = lsr;
            } else {
                  dbg ("%s - ===== Port %d LSR Status = %02x ======",
                       __FUNCTION__, port_number, lsr);
                  handle_new_lsr (edge_port, 0, lsr, 0);
            }
            break;

      case TIUMP_INTERRUPT_CODE_MSR:      // MSR
            /* Copy MSR from UMP */
            msr = data[1];
            dbg ("%s - ===== Port %u MSR Status = %02x ======\n",
                 __FUNCTION__, port_number, msr);
            handle_new_msr (edge_port, msr);
            break;

      default:
            dev_err (&urb->dev->dev, "%s - Unknown Interrupt code from UMP %x\n",
                   __FUNCTION__, data[1]);
            break;
            
      }

exit:
      retval = usb_submit_urb (urb, GFP_ATOMIC);
      if (retval)
            dev_err (&urb->dev->dev, "%s - usb_submit_urb failed with result %d\n",
                   __FUNCTION__, retval);
}

static void edge_bulk_in_callback (struct urb *urb)
{
      struct edgeport_port *edge_port = (struct edgeport_port *)urb->context;
      unsigned char *data = urb->transfer_buffer;
      struct tty_struct *tty;
      int retval = 0;
      int port_number;
      int status = urb->status;

      dbg("%s", __FUNCTION__);

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

      if (status == -EPIPE)
            goto exit;

      if (status) {
            dev_err(&urb->dev->dev,"%s - stopping read!\n", __FUNCTION__);
            return;
      }

      port_number = edge_port->port->number - edge_port->port->serial->minor;

      if (edge_port->lsr_event) {
            edge_port->lsr_event = 0;
            dbg ("%s ===== Port %u LSR Status = %02x, Data = %02x ======",
                 __FUNCTION__, port_number, edge_port->lsr_mask, *data);
            handle_new_lsr (edge_port, 1, edge_port->lsr_mask, *data);
            /* Adjust buffer length/pointer */
            --urb->actual_length;
            ++data;
      }

      tty = edge_port->port->tty;
      if (tty && urb->actual_length) {
            usb_serial_debug_data(debug, &edge_port->port->dev, __FUNCTION__, urb->actual_length, data);

            if (edge_port->close_pending) {
                  dbg ("%s - close is pending, dropping data on the floor.", __FUNCTION__);
            } else {
                  edge_tty_recv(&edge_port->port->dev, tty, data, urb->actual_length);
            }
            edge_port->icount.rx += urb->actual_length;
      }

exit:
      /* continue read unless stopped */
      spin_lock(&edge_port->ep_lock);
      if (edge_port->ep_read_urb_state == EDGE_READ_URB_RUNNING) {
            urb->dev = edge_port->port->serial->dev;
            retval = usb_submit_urb(urb, GFP_ATOMIC);
      } else if (edge_port->ep_read_urb_state == EDGE_READ_URB_STOPPING) {
            edge_port->ep_read_urb_state = EDGE_READ_URB_STOPPED;
      }
      spin_unlock(&edge_port->ep_lock);
      if (retval)
            dev_err (&urb->dev->dev, "%s - usb_submit_urb failed with result %d\n",
                   __FUNCTION__, retval);
}

static void edge_tty_recv(struct device *dev, struct tty_struct *tty, unsigned char *data, int length)
{
      int cnt;

      do {
            cnt = tty_buffer_request_room(tty, length);
            if (cnt < length) {
                  dev_err(dev, "%s - dropping data, %d bytes lost\n",
                        __FUNCTION__, length - cnt);
                  if(cnt == 0)
                        break;
            }
            tty_insert_flip_string(tty, data, cnt);
            data += cnt;
            length -= cnt;
      } while (length > 0);

      tty_flip_buffer_push(tty);
}

static void edge_bulk_out_callback (struct urb *urb)
{
      struct usb_serial_port *port = (struct usb_serial_port *)urb->context;
      struct edgeport_port *edge_port = usb_get_serial_port_data(port);
      int status = urb->status;

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

      edge_port->ep_write_urb_in_use = 0;

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

      /* send any buffered data */
      edge_send(port);
}

static int edge_open (struct usb_serial_port *port, struct file * filp)
{
      struct edgeport_port *edge_port = usb_get_serial_port_data(port);
      struct edgeport_serial *edge_serial;
      struct usb_device *dev;
      struct urb *urb;
      int port_number;
      int status;
      u16 open_settings;
      u8 transaction_timeout;

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

      if (edge_port == NULL)
            return -ENODEV;

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

      port_number = port->number - port->serial->minor;
      switch (port_number) {
            case 0:
                  edge_port->uart_base = UMPMEM_BASE_UART1;
                  edge_port->dma_address = UMPD_OEDB1_ADDRESS;
                  break;
            case 1:
                  edge_port->uart_base = UMPMEM_BASE_UART2;
                  edge_port->dma_address = UMPD_OEDB2_ADDRESS;
                  break;
            default:
                  dev_err (&port->dev, "Unknown port number!!!\n");
                  return -ENODEV;
      }

      dbg ("%s - port_number = %d, uart_base = %04x, dma_address = %04x",
           __FUNCTION__, port_number, edge_port->uart_base, edge_port->dma_address);

      dev = port->serial->dev;

      memset (&(edge_port->icount), 0x00, sizeof(edge_port->icount));
      init_waitqueue_head (&edge_port->delta_msr_wait);

      /* turn off loopback */
      status = TIClearLoopBack (edge_port);
      if (status) {
            dev_err(&port->dev,"%s - cannot send clear loopback command, %d\n",
                  __FUNCTION__, status);
            return status;
      }
      
      /* set up the port settings */
      edge_set_termios (port, NULL);

      /* open up the port */

      /* milliseconds to timeout for DMA transfer */
      transaction_timeout = 2;

      edge_port->ump_read_timeout = max (20, ((transaction_timeout * 3) / 2) );

      // milliseconds to timeout for DMA transfer
      open_settings = (u8)(UMP_DMA_MODE_CONTINOUS | 
                       UMP_PIPE_TRANS_TIMEOUT_ENA | 
                       (transaction_timeout << 2));

      dbg ("%s - Sending UMPC_OPEN_PORT", __FUNCTION__);

      /* Tell TI to open and start the port */
      status = TIWriteCommandSync (dev,
                              UMPC_OPEN_PORT,
                              (u8)(UMPM_UART1_PORT + port_number),
                              open_settings,
                              NULL,
                              0);
      if (status) {
            dev_err(&port->dev,"%s - cannot send open command, %d\n", __FUNCTION__, status);
            return status;
      }

      /* Start the DMA? */
      status = TIWriteCommandSync (dev,
                              UMPC_START_PORT,
                              (u8)(UMPM_UART1_PORT + port_number),
                              0,
                              NULL,
                              0);
      if (status) {
            dev_err(&port->dev,"%s - cannot send start DMA command, %d\n", __FUNCTION__, status);
            return status;
      }

      /* Clear TX and RX buffers in UMP */
      status = TIPurgeDataSync (port, UMP_PORT_DIR_OUT | UMP_PORT_DIR_IN);
      if (status) {
            dev_err(&port->dev,"%s - cannot send clear buffers command, %d\n", __FUNCTION__, status);
            return status;
      }

      /* Read Initial MSR */
      status = TIReadVendorRequestSync (dev,
                              UMPC_READ_MSR,    // Request
                              0,          // wValue
                              (__u16)(UMPM_UART1_PORT + port_number),   // wIndex (Address)
                              &edge_port->shadow_msr,             // TransferBuffer
                              1);                           // TransferBufferLength
      if (status) {
            dev_err(&port->dev,"%s - cannot send read MSR command, %d\n", __FUNCTION__, status);
            return status;
      }

      dbg ("ShadowMSR 0x%X", edge_port->shadow_msr);
 
      /* Set Initial MCR */
      edge_port->shadow_mcr = MCR_RTS | MCR_DTR;
      dbg ("ShadowMCR 0x%X", edge_port->shadow_mcr);

      edge_serial = edge_port->edge_serial;
      if (down_interruptible(&edge_serial->es_sem))
            return -ERESTARTSYS;
      if (edge_serial->num_ports_open == 0) {
            /* we are the first port to be opened, let's post the interrupt urb */
            urb = edge_serial->serial->port[0]->interrupt_in_urb;
            if (!urb) {
                  dev_err (&port->dev, "%s - no interrupt urb present, exiting\n", __FUNCTION__);
                  status = -EINVAL;
                  goto up_es_sem;
            }
            urb->complete = edge_interrupt_callback;
            urb->context = edge_serial;
            urb->dev = dev;
            status = usb_submit_urb (urb, GFP_KERNEL);
            if (status) {
                  dev_err (&port->dev, "%s - usb_submit_urb failed with value %d\n", __FUNCTION__, status);
                  goto up_es_sem;
            }
      }

      /*
       * reset the data toggle on the bulk endpoints to work around bug in
       * host controllers where things get out of sync some times
       */
      usb_clear_halt (dev, port->write_urb->pipe);
      usb_clear_halt (dev, port->read_urb->pipe);

      /* start up our bulk read urb */
      urb = port->read_urb;
      if (!urb) {
            dev_err (&port->dev, "%s - no read urb present, exiting\n", __FUNCTION__);
            status = -EINVAL;
            goto unlink_int_urb;
      }
      edge_port->ep_read_urb_state = EDGE_READ_URB_RUNNING;
      urb->complete = edge_bulk_in_callback;
      urb->context = edge_port;
      urb->dev = dev;
      status = usb_submit_urb (urb, GFP_KERNEL);
      if (status) {
            dev_err (&port->dev, "%s - read bulk usb_submit_urb failed with value %d\n", __FUNCTION__, status);
            goto unlink_int_urb;
      }

      ++edge_serial->num_ports_open;

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

      goto up_es_sem;

unlink_int_urb:
      if (edge_port->edge_serial->num_ports_open == 0)
            usb_kill_urb(port->serial->port[0]->interrupt_in_urb);
up_es_sem:
      up(&edge_serial->es_sem);
      return status;
}

static void edge_close (struct usb_serial_port *port, struct file *filp)
{
      struct edgeport_serial *edge_serial;
      struct edgeport_port *edge_port;
      int port_number;
      int status;

      dbg("%s - port %d", __FUNCTION__, port->number);
                   
      edge_serial = usb_get_serial_data(port->serial);
      edge_port = usb_get_serial_port_data(port);
      if ((edge_serial == NULL) || (edge_port == NULL))
            return;
      
      /* The bulkreadcompletion routine will check 
       * this flag and dump add read data */
      edge_port->close_pending = 1;

      /* chase the port close and flush */
      TIChasePort (edge_port, (HZ*closing_wait)/100, 1);

      usb_kill_urb(port->read_urb);
      usb_kill_urb(port->write_urb);
      edge_port->ep_write_urb_in_use = 0;

      /* assuming we can still talk to the device,
       * send a close port command to it */
      dbg("%s - send umpc_close_port", __FUNCTION__);
      port_number = port->number - port->serial->minor;
      status = TIWriteCommandSync (port->serial->dev,
                             UMPC_CLOSE_PORT,
                             (__u8)(UMPM_UART1_PORT + port_number),
                             0,
                             NULL,
                             0);
      down(&edge_serial->es_sem);
      --edge_port->edge_serial->num_ports_open;
      if (edge_port->edge_serial->num_ports_open <= 0) {
            /* last port is now closed, let's shut down our interrupt urb */
            usb_kill_urb(port->serial->port[0]->interrupt_in_urb);
            edge_port->edge_serial->num_ports_open = 0;
      }
      up(&edge_serial->es_sem);
      edge_port->close_pending = 0;

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

static int edge_write (struct usb_serial_port *port, const unsigned char *data, int count)
{
      struct edgeport_port *edge_port = usb_get_serial_port_data(port);
      unsigned long flags;

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

      if (count == 0) {
            dbg("%s - write request of 0 bytes", __FUNCTION__);
            return 0;
      }

      if (edge_port == NULL)
            return -ENODEV;
      if (edge_port->close_pending == 1)
            return -ENODEV;

      spin_lock_irqsave(&edge_port->ep_lock, flags);
      count = edge_buf_put(edge_port->ep_out_buf, data, count);
      spin_unlock_irqrestore(&edge_port->ep_lock, flags);

      edge_send(port);

      return count;
}

static void edge_send(struct usb_serial_port *port)
{
      int count, result;
      struct edgeport_port *edge_port = usb_get_serial_port_data(port);
      struct tty_struct *tty = port->tty;
      unsigned long flags;


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

      spin_lock_irqsave(&edge_port->ep_lock, flags);

      if (edge_port->ep_write_urb_in_use) {
            spin_unlock_irqrestore(&edge_port->ep_lock, flags);
            return;
      }

      count = edge_buf_get(edge_port->ep_out_buf,
                        port->write_urb->transfer_buffer,
                        port->bulk_out_size);

      if (count == 0) {
            spin_unlock_irqrestore(&edge_port->ep_lock, flags);
            return;
      }

      edge_port->ep_write_urb_in_use = 1;

      spin_unlock_irqrestore(&edge_port->ep_lock, flags);

      usb_serial_debug_data(debug, &port->dev, __FUNCTION__, count, port->write_urb->transfer_buffer);

      /* set up our urb */
      usb_fill_bulk_urb (port->write_urb, port->serial->dev,
                     usb_sndbulkpipe (port->serial->dev,
                                  port->bulk_out_endpointAddress),
                     port->write_urb->transfer_buffer, count,
                     edge_bulk_out_callback,
                     port);

      /* send the data out the bulk port */
      result = usb_submit_urb(port->write_urb, GFP_ATOMIC);
      if (result) {
            dev_err(&port->dev, "%s - failed submitting write urb, error %d\n", __FUNCTION__, result);
            edge_port->ep_write_urb_in_use = 0;
            // TODO: reschedule edge_send
      } else {
            edge_port->icount.tx += count;
      }

      /* wakeup any process waiting for writes to complete */
      /* there is now more room in the buffer for new writes */
      if (tty) {
            /* let the tty driver wakeup if it has a special write_wakeup function */
            tty_wakeup(tty);
      }
}

static int edge_write_room (struct usb_serial_port *port)
{
      struct edgeport_port *edge_port = usb_get_serial_port_data(port);
      int room = 0;
      unsigned long flags;

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

      if (edge_port == NULL)
            return -ENODEV;
      if (edge_port->close_pending == 1)
            return -ENODEV;

      spin_lock_irqsave(&edge_port->ep_lock, flags);
      room = edge_buf_space_avail(edge_port->ep_out_buf);
      spin_unlock_irqrestore(&edge_port->ep_lock, flags);

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

static int edge_chars_in_buffer (struct usb_serial_port *port)
{
      struct edgeport_port *edge_port = usb_get_serial_port_data(port);
      int chars = 0;
      unsigned long flags;

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

      if (edge_port == NULL)
            return -ENODEV;
      if (edge_port->close_pending == 1)
            return -ENODEV;

      spin_lock_irqsave(&edge_port->ep_lock, flags);
      chars = edge_buf_data_avail(edge_port->ep_out_buf);
      spin_unlock_irqrestore(&edge_port->ep_lock, flags);

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

static void edge_throttle (struct usb_serial_port *port)
{
      struct edgeport_port *edge_port = usb_get_serial_port_data(port);
      struct tty_struct *tty;
      int status;

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

      if (edge_port == NULL)
            return;

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

      /* if we are implementing XON/XOFF, send the stop character */
      if (I_IXOFF(tty)) {
            unsigned char stop_char = STOP_CHAR(tty);
            status = edge_write (port, &stop_char, 1);
            if (status <= 0) {
                  dev_err(&port->dev, "%s - failed to write stop character, %d\n", __FUNCTION__, status);
            }
      }

      /* if we are implementing RTS/CTS, stop reads */
      /* and the Edgeport will clear the RTS line */
      if (C_CRTSCTS(tty))
            stop_read(edge_port);

}

static void edge_unthrottle (struct usb_serial_port *port)
{
      struct edgeport_port *edge_port = usb_get_serial_port_data(port);
      struct tty_struct *tty;
      int status;

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

      if (edge_port == NULL)
            return;

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

      /* if we are implementing XON/XOFF, send the start character */
      if (I_IXOFF(tty)) {
            unsigned char start_char = START_CHAR(tty);
            status = edge_write (port, &start_char, 1);
            if (status <= 0) {
                  dev_err(&port->dev, "%s - failed to write start character, %d\n", __FUNCTION__, status);
            }
      }

      /* if we are implementing RTS/CTS, restart reads */
      /* are the Edgeport will assert the RTS line */
      if (C_CRTSCTS(tty)) {
            status = restart_read(edge_port);
            if (status)
                  dev_err(&port->dev, "%s - read bulk usb_submit_urb failed with value %d\n", __FUNCTION__, status);
      }

}

static void stop_read(struct edgeport_port *edge_port)
{
      unsigned long flags;

      spin_lock_irqsave(&edge_port->ep_lock, flags);

      if (edge_port->ep_read_urb_state == EDGE_READ_URB_RUNNING)
            edge_port->ep_read_urb_state = EDGE_READ_URB_STOPPING;
      edge_port->shadow_mcr &= ~MCR_RTS;

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

static int restart_read(struct edgeport_port *edge_port)
{
      struct urb *urb;
      int status = 0;
      unsigned long flags;

      spin_lock_irqsave(&edge_port->ep_lock, flags);

      if (edge_port->ep_read_urb_state == EDGE_READ_URB_STOPPED) {
            urb = edge_port->port->read_urb;
            urb->complete = edge_bulk_in_callback;
            urb->context = edge_port;
            urb->dev = edge_port->port->serial->dev;
            status = usb_submit_urb(urb, GFP_ATOMIC);
      }
      edge_port->ep_read_urb_state = EDGE_READ_URB_RUNNING;
      edge_port->shadow_mcr |= MCR_RTS;

      spin_unlock_irqrestore(&edge_port->ep_lock, flags);

      return status;
}

static void change_port_settings (struct edgeport_port *edge_port, struct ktermios *old_termios)
{
      struct ump_uart_config *config;
      struct tty_struct *tty;
      int baud;
      unsigned cflag;
      int status;
      int port_number = edge_port->port->number - edge_port->port->serial->minor;

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

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

      config = kmalloc (sizeof (*config), GFP_KERNEL);
      if (!config) {
            dev_err (&edge_port->port->dev, "%s - out of memory\n", __FUNCTION__);
            return;
      }

      cflag = tty->termios->c_cflag;

      config->wFlags = 0;

      /* These flags must be set */
      config->wFlags |= UMP_MASK_UART_FLAGS_RECEIVE_MS_INT;
      config->wFlags |= UMP_MASK_UART_FLAGS_AUTO_START_ON_ERR;
      config->bUartMode = (__u8)(edge_port->bUartMode);

      switch (cflag & CSIZE) {
            case CS5:
                      config->bDataBits = UMP_UART_CHAR5BITS;
                      dbg ("%s - data bits = 5", __FUNCTION__);
                      break;
            case CS6:
                      config->bDataBits = UMP_UART_CHAR6BITS;
                      dbg ("%s - data bits = 6", __FUNCTION__);
                      break;
            case CS7:
                      config->bDataBits = UMP_UART_CHAR7BITS;
                      dbg ("%s - data bits = 7", __FUNCTION__);
                      break;
            default:
            case CS8:
                      config->bDataBits = UMP_UART_CHAR8BITS;
                      dbg ("%s - data bits = 8", __FUNCTION__);
                      break;
      }

      if (cflag & PARENB) {
            if (cflag & PARODD) {
                  config->wFlags |= UMP_MASK_UART_FLAGS_PARITY;
                  config->bParity = UMP_UART_ODDPARITY;
                  dbg("%s - parity = odd", __FUNCTION__);
            } else {
                  config->wFlags |= UMP_MASK_UART_FLAGS_PARITY;
                  config->bParity = UMP_UART_EVENPARITY;
                  dbg("%s - parity = even", __FUNCTION__);
            }
      } else {
            config->bParity = UMP_UART_NOPARITY;      
            dbg("%s - parity = none", __FUNCTION__);
      }

      if (cflag & CSTOPB) {
            config->bStopBits = UMP_UART_STOPBIT2;
            dbg("%s - stop bits = 2", __FUNCTION__);
      } else {
            config->bStopBits = UMP_UART_STOPBIT1;
            dbg("%s - stop bits = 1", __FUNCTION__);
      }

      /* figure out the flow control settings */
      if (cflag & CRTSCTS) {
            config->wFlags |= UMP_MASK_UART_FLAGS_OUT_X_CTS_FLOW;
            config->wFlags |= UMP_MASK_UART_FLAGS_RTS_FLOW;
            dbg("%s - RTS/CTS is enabled", __FUNCTION__);
      } else {
            dbg("%s - RTS/CTS is disabled", __FUNCTION__);
            tty->hw_stopped = 0;
            restart_read(edge_port);
      }

      /* if we are implementing XON/XOFF, set the start and stop character in the device */
      if (I_IXOFF(tty) || I_IXON(tty)) {
            config->cXon  = START_CHAR(tty);
            config->cXoff = STOP_CHAR(tty);

            /* if we are implementing INBOUND XON/XOFF */
            if (I_IXOFF(tty)) {
                  config->wFlags |= UMP_MASK_UART_FLAGS_IN_X;
                  dbg ("%s - INBOUND XON/XOFF is enabled, XON = %2x, XOFF = %2x",
                       __FUNCTION__, config->cXon, config->cXoff);
            } else {
                  dbg ("%s - INBOUND XON/XOFF is disabled", __FUNCTION__);
            }

            /* if we are implementing OUTBOUND XON/XOFF */
            if (I_IXON(tty)) {
                  config->wFlags |= UMP_MASK_UART_FLAGS_OUT_X;
                  dbg ("%s - OUTBOUND XON/XOFF is enabled, XON = %2x, XOFF = %2x",
                       __FUNCTION__, config->cXon, config->cXoff);
            } else {
                  dbg ("%s - OUTBOUND XON/XOFF is disabled", __FUNCTION__);
            }
      }

      /* Round the baud rate */
      baud = tty_get_baud_rate(tty);
      if (!baud) {
            /* pick a default, any default... */
            baud = 9600;
      }
      edge_port->baud_rate = baud;
      config->wBaudRate = (__u16)((461550L + baud/2) / baud);

      dbg ("%s - baud rate = %d, wBaudRate = %d", __FUNCTION__, baud, config->wBaudRate);

      dbg ("wBaudRate:   %d", (int)(461550L / config->wBaudRate));
      dbg ("wFlags:    0x%x", config->wFlags);
      dbg ("bDataBits:   %d", config->bDataBits);
      dbg ("bParity:     %d", config->bParity);
      dbg ("bStopBits:   %d", config->bStopBits);
      dbg ("cXon:        %d", config->cXon);
      dbg ("cXoff:       %d", config->cXoff);
      dbg ("bUartMode:   %d", config->bUartMode);

      /* move the word values into big endian mode */
      cpu_to_be16s (&config->wFlags);
      cpu_to_be16s (&config->wBaudRate);

      status = TIWriteCommandSync (edge_port->port->serial->dev,
                        UMPC_SET_CONFIG,
                        (__u8)(UMPM_UART1_PORT + port_number),
                        0,
                        (__u8 *)config,
                        sizeof(*config));
      if (status) {
            dbg ("%s - error %d when trying to write config to device",
                 __FUNCTION__, status);
      }

      kfree (config);
      
      return;
}

static void edge_set_termios (struct usb_serial_port *port, struct ktermios *old_termios)
{
      struct edgeport_port *edge_port = usb_get_serial_port_data(port);
      struct tty_struct *tty = port->tty;
      unsigned int cflag;

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

      cflag = tty->termios->c_cflag;

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

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

      if (edge_port == NULL)
            return;

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

      return;
}

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

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

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

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

      edge_port->shadow_mcr = mcr;

      TIRestoreMCR (edge_port, mcr);

      return 0;
}

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

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

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


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

      return result;
}

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

      if (!retinfo)
            return -EFAULT;

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

      tmp.type          = PORT_16550A;
      tmp.line          = edge_port->port->serial->minor;
      tmp.port          = edge_port->port->number;
      tmp.irq                 = 0;
      tmp.flags         = ASYNC_SKIP_TEST | ASYNC_AUTO_IRQ;
      tmp.xmit_fifo_size      = edge_port->port->bulk_out_size;
      tmp.baud_base           = 9600;
      tmp.close_delay         = 5*HZ;
      tmp.closing_wait  = closing_wait;
//    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;
}

static int edge_ioctl (struct usb_serial_port *port, struct file *file, unsigned int cmd, unsigned long arg)
{
      struct edgeport_port *edge_port = usb_get_serial_port_data(port);
      struct async_icount cnow;
      struct async_icount cprev;

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

      switch (cmd) {
            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);
                  break;

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

            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;
                  }
                  /* not reached */
                  break;

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

      return -ENOIOCTLCMD;
}

static void edge_break (struct usb_serial_port *port, int break_state)
{
      struct edgeport_port *edge_port = usb_get_serial_port_data(port);
      int status;

      dbg ("%s - state = %d", __FUNCTION__, break_state);

      /* chase the port close */
      TIChasePort (edge_port, 0, 0);

      if (break_state == -1) {
            status = TISetBreak (edge_port);
      } else {
            status = TIClearBreak (edge_port);
      }
      if (status) {
            dbg ("%s - error %d sending break set/clear command.",
                 __FUNCTION__, status);
      }
}

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

      dev = serial->dev;

      /* create our private serial structure */
      edge_serial = kzalloc(sizeof(struct edgeport_serial), GFP_KERNEL);
      if (edge_serial == NULL) {
            dev_err(&serial->dev->dev, "%s - Out of memory\n", __FUNCTION__);
            return -ENOMEM;
      }
      sema_init(&edge_serial->es_sem, 1);
      edge_serial->serial = serial;
      usb_set_serial_data(serial, edge_serial);

      status = TIDownloadFirmware (edge_serial);
      if (status) {
            kfree (edge_serial);
            return status;
      }

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

cleanup:
      for (--i; i>=0; --i) {
            edge_port = usb_get_serial_port_data(serial->port[i]);
            edge_buf_free(edge_port->ep_out_buf);
            kfree(edge_port);
            usb_set_serial_port_data(serial->port[i], NULL);
      }
      kfree (edge_serial);
      usb_set_serial_data(serial, NULL);
      return -ENOMEM;
}

static void edge_shutdown (struct usb_serial *serial)
{
      int i;
      struct edgeport_port *edge_port;

      dbg ("%s", __FUNCTION__);

      for (i = 0; i < serial->num_ports; ++i) {
            edge_port = usb_get_serial_port_data(serial->port[i]);
            edge_remove_sysfs_attrs(edge_port->port);
            edge_buf_free(edge_port->ep_out_buf);
            kfree(edge_port);
            usb_set_serial_port_data(serial->port[i], NULL);
      }
      kfree(usb_get_serial_data(serial));
      usb_set_serial_data(serial, NULL);
}


/* Sysfs Attributes */

static ssize_t show_uart_mode(struct device *dev,
      struct device_attribute *attr, char *buf)
{
      struct usb_serial_port *port = to_usb_serial_port(dev);
      struct edgeport_port *edge_port = usb_get_serial_port_data(port);

      return sprintf(buf, "%d\n", edge_port->bUartMode);
}

static ssize_t store_uart_mode(struct device *dev,
      struct device_attribute *attr, const char *valbuf, size_t count)
{
      struct usb_serial_port *port = to_usb_serial_port(dev);
      struct edgeport_port *edge_port = usb_get_serial_port_data(port);
      unsigned int v = simple_strtoul(valbuf, NULL, 0);

      dbg("%s: setting uart_mode = %d", __FUNCTION__, v);

      if (v < 256)
            edge_port->bUartMode = v;
      else
            dev_err(dev, "%s - uart_mode %d is invalid\n", __FUNCTION__, v);

      return count;
}

static DEVICE_ATTR(uart_mode, S_IWUSR | S_IRUGO, show_uart_mode, store_uart_mode);

static int edge_create_sysfs_attrs(struct usb_serial_port *port)
{
      return device_create_file(&port->dev, &dev_attr_uart_mode);
}

static int edge_remove_sysfs_attrs(struct usb_serial_port *port)
{
      device_remove_file(&port->dev, &dev_attr_uart_mode);
      return 0;
}


/* Circular Buffer */

/*
 * edge_buf_alloc
 *
 * Allocate a circular buffer and all associated memory.
 */

static struct edge_buf *edge_buf_alloc(unsigned int size)
{
      struct edge_buf *eb;


      if (size == 0)
            return NULL;

      eb = kmalloc(sizeof(struct edge_buf), GFP_KERNEL);
      if (eb == NULL)
            return NULL;

      eb->buf_buf = kmalloc(size, GFP_KERNEL);
      if (eb->buf_buf == NULL) {
            kfree(eb);
            return NULL;
      }

      eb->buf_size = size;
      eb->buf_get = eb->buf_put = eb->buf_buf;

      return eb;
}


/*
 * edge_buf_free
 *
 * Free the buffer and all associated memory.
 */

static void edge_buf_free(struct edge_buf *eb)
{
      if (eb) {
            kfree(eb->buf_buf);
            kfree(eb);
      }
}


/*
 * edge_buf_clear
 *
 * Clear out all data in the circular buffer.
 */

static void edge_buf_clear(struct edge_buf *eb)
{
        if (eb != NULL)
                eb->buf_get = eb->buf_put;
                /* equivalent to a get of all data available */
}


/*
 * edge_buf_data_avail
 *
 * Return the number of bytes of data available in the circular
 * buffer.
 */

static unsigned int edge_buf_data_avail(struct edge_buf *eb)
{
      if (eb != NULL)
            return ((eb->buf_size + eb->buf_put - eb->buf_get) % eb->buf_size);
      else
            return 0;
}


/*
 * edge_buf_space_avail
 *
 * Return the number of bytes of space available in the circular
 * buffer.
 */

static unsigned int edge_buf_space_avail(struct edge_buf *eb)
{
      if (eb != NULL)
            return ((eb->buf_size + eb->buf_get - eb->buf_put - 1) % eb->buf_size);
      else
            return 0;
}


/*
 * edge_buf_put
 *
 * Copy data data from a user buffer and put it into the circular buffer.
 * Restrict to the amount of space available.
 *
 * Return the number of bytes copied.
 */

static unsigned int edge_buf_put(struct edge_buf *eb, const char *buf,
      unsigned int count)
{
      unsigned int len;


      if (eb == NULL)
            return 0;

      len  = edge_buf_space_avail(eb);
      if (count > len)
            count = len;

      if (count == 0)
            return 0;

      len = eb->buf_buf + eb->buf_size - eb->buf_put;
      if (count > len) {
            memcpy(eb->buf_put, buf, len);
            memcpy(eb->buf_buf, buf+len, count - len);
            eb->buf_put = eb->buf_buf + count - len;
      } else {
            memcpy(eb->buf_put, buf, count);
            if (count < len)
                  eb->buf_put += count;
            else /* count == len */
                  eb->buf_put = eb->buf_buf;
      }

      return count;
}


/*
 * edge_buf_get
 *
 * Get data from the circular buffer and copy to the given buffer.
 * Restrict to the amount of data available.
 *
 * Return the number of bytes copied.
 */

static unsigned int edge_buf_get(struct edge_buf *eb, char *buf,
      unsigned int count)
{
      unsigned int len;


      if (eb == NULL)
            return 0;

      len = edge_buf_data_avail(eb);
      if (count > len)
            count = len;

      if (count == 0)
            return 0;

      len = eb->buf_buf + eb->buf_size - eb->buf_get;
      if (count > len) {
            memcpy(buf, eb->buf_get, len);
            memcpy(buf+len, eb->buf_buf, count - len);
            eb->buf_get = eb->buf_buf + count - len;
      } else {
            memcpy(buf, eb->buf_get, count);
            if (count < len)
                  eb->buf_get += count;
            else /* count == len */
                  eb->buf_get = eb->buf_buf;
      }

      return count;
}


static struct usb_serial_driver edgeport_1port_device = {
      .driver = {
            .owner            = THIS_MODULE,
            .name       = "edgeport_ti_1",
      },
      .description            = "Edgeport TI 1 port adapter",
      .usb_driver       = &io_driver,
      .id_table         = edgeport_1port_id_table,
      .num_interrupt_in = 1,
      .num_bulk_in            = 1,
      .num_bulk_out           = 1,
      .num_ports        = 1,
      .open             = edge_open,
      .close                  = edge_close,
      .throttle         = edge_throttle,
      .unthrottle       = edge_unthrottle,
      .attach                 = edge_startup,
      .shutdown         = edge_shutdown,
      .port_probe       = edge_create_sysfs_attrs,
      .ioctl                  = edge_ioctl,
      .set_termios            = edge_set_termios,
      .tiocmget         = edge_tiocmget,
      .tiocmset         = edge_tiocmset,
      .write                  = edge_write,
      .write_room       = edge_write_room,
      .chars_in_buffer  = edge_chars_in_buffer,
      .break_ctl        = edge_break,
      .read_int_callback      = edge_interrupt_callback,
      .read_bulk_callback     = edge_bulk_in_callback,
      .write_bulk_callback    = edge_bulk_out_callback,
};

static struct usb_serial_driver edgeport_2port_device = {
      .driver = {
            .owner            = THIS_MODULE,
            .name       = "edgeport_ti_2",
      },
      .description            = "Edgeport TI 2 port adapter",
      .usb_driver       = &io_driver,
      .id_table         = edgeport_2port_id_table,
      .num_interrupt_in = 1,
      .num_bulk_in            = 2,
      .num_bulk_out           = 2,
      .num_ports        = 2,
      .open             = edge_open,
      .close                  = edge_close,
      .throttle         = edge_throttle,
      .unthrottle       = edge_unthrottle,
      .attach                 = edge_startup,
      .shutdown         = edge_shutdown,
      .port_probe       = edge_create_sysfs_attrs,
      .ioctl                  = edge_ioctl,
      .set_termios            = edge_set_termios,
      .tiocmget         = edge_tiocmget,
      .tiocmset         = edge_tiocmset,
      .write                  = edge_write,
      .write_room       = edge_write_room,
      .chars_in_buffer  = edge_chars_in_buffer,
      .break_ctl        = edge_break,
      .read_int_callback      = edge_interrupt_callback,
      .read_bulk_callback     = edge_bulk_in_callback,
      .write_bulk_callback    = edge_bulk_out_callback,
};


static int __init edgeport_init(void)
{
      int retval;
      retval = usb_serial_register(&edgeport_1port_device);
      if (retval)
            goto failed_1port_device_register;
      retval = usb_serial_register(&edgeport_2port_device);
      if (retval)
            goto failed_2port_device_register;
      retval = usb_register(&io_driver);
      if (retval) 
            goto failed_usb_register;
      info(DRIVER_DESC " " DRIVER_VERSION);
      return 0;
failed_usb_register:
      usb_serial_deregister(&edgeport_2port_device);
failed_2port_device_register:
      usb_serial_deregister(&edgeport_1port_device);
failed_1port_device_register:
      return retval;
}

static void __exit edgeport_exit (void)
{
      usb_deregister (&io_driver);
      usb_serial_deregister (&edgeport_1port_device);
      usb_serial_deregister (&edgeport_2port_device);
}

module_init(edgeport_init);
module_exit(edgeport_exit);

/* Module information */
MODULE_AUTHOR(DRIVER_AUTHOR);
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("GPL");

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

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

module_param(closing_wait, int, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(closing_wait, "Maximum wait for data to drain, in .01 secs");

module_param(ignore_cpu_rev, bool, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(ignore_cpu_rev, "Ignore the cpu revision when connecting to a device");

module_param(default_uart_mode, int, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(default_uart_mode, "Default uart_mode, 0=RS232, ...");


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