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whiteheat.c

/*
 * USB ConnectTech WhiteHEAT driver
 *
 *    Copyright (C) 2002
 *        Connect Tech Inc.
 *
 *    Copyright (C) 1999 - 2001
 *        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.
 *
 * See Documentation/usb/usb-serial.txt for more information on using this driver
 *
 * (10/09/2002) Stuart MacDonald (stuartm@connecttech.com)
 *    Upgrade to full working driver
 *
 * (05/30/2001) gkh
 *    switched from using spinlock to a semaphore, which fixes lots of problems.
 *
 * (04/08/2001) gb
 *    Identify version on module load.
 * 
 * 2001_Mar_19 gkh
 *    Fixed MOD_INC and MOD_DEC logic, the ability to open a port more 
 *    than once, and the got the proper usb_device_id table entries so
 *    the driver works again.
 *
 * (11/01/2000) Adam J. Richter
 *    usb_device_id table support
 * 
 * (10/05/2000) gkh
 *    Fixed bug with urb->dev not being set properly, now that the usb
 *    core needs it.
 * 
 * (10/03/2000) smd
 *    firmware is improved to guard against crap sent to device
 *    firmware now replies CMD_FAILURE on bad things
 *    read_callback fix you provided for private info struct
 *    command_finished now indicates success or fail
 *    setup_port struct now packed to avoid gcc padding
 *    firmware uses 1 based port numbering, driver now handles that
 *
 * (09/11/2000) gkh
 *    Removed DEBUG #ifdefs with call to usb_serial_debug_data
 *
 * (07/19/2000) gkh
 *    Added module_init and module_exit functions to handle the fact that this
 *    driver is a loadable module now.
 *    Fixed bug with port->minor that was found by Al Borchers
 *
 * (07/04/2000) gkh
 *    Added support for port settings. Baud rate can now be changed. Line signals
 *    are not transferred to and from the tty layer yet, but things seem to be 
 *    working well now.
 *
 * (05/04/2000) gkh
 *    First cut at open and close commands. Data can flow through the ports at
 *    default speeds now.
 *
 * (03/26/2000) gkh
 *    Split driver up into device specific pieces.
 * 
 */

#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/tty.h>
#include <linux/tty_driver.h>
#include <linux/tty_flip.h>
#include <linux/module.h>
#include <linux/spinlock.h>
#include <linux/mutex.h>
#include <asm/uaccess.h>
#include <asm/termbits.h>
#include <linux/usb.h>
#include <linux/serial_reg.h>
#include <linux/serial.h>
#include <linux/usb/serial.h>
#include "whiteheat_fw.h"           /* firmware for the ConnectTech WhiteHEAT device */
#include "whiteheat.h"              /* WhiteHEAT specific commands */

static int debug;

#ifndef CMSPAR
#define CMSPAR 0
#endif

/*
 * Version Information
 */
#define DRIVER_VERSION "v2.0"
#define DRIVER_AUTHOR "Greg Kroah-Hartman <greg@kroah.com>, Stuart MacDonald <stuartm@connecttech.com>"
#define DRIVER_DESC "USB ConnectTech WhiteHEAT driver"

#define CONNECT_TECH_VENDOR_ID            0x0710
#define CONNECT_TECH_FAKE_WHITE_HEAT_ID   0x0001
#define CONNECT_TECH_WHITE_HEAT_ID  0x8001

/*
   ID tables for whiteheat are unusual, because we want to different
   things for different versions of the device.  Eventually, this
   will be doable from a single table.  But, for now, we define two
   separate ID tables, and then a third table that combines them
   just for the purpose of exporting the autoloading information.
*/
static struct usb_device_id id_table_std [] = {
      { USB_DEVICE(CONNECT_TECH_VENDOR_ID, CONNECT_TECH_WHITE_HEAT_ID) },
      { }                                 /* Terminating entry */
};

static struct usb_device_id id_table_prerenumeration [] = {
      { USB_DEVICE(CONNECT_TECH_VENDOR_ID, CONNECT_TECH_FAKE_WHITE_HEAT_ID) },
      { }                                 /* Terminating entry */
};

static struct usb_device_id id_table_combined [] = {
      { USB_DEVICE(CONNECT_TECH_VENDOR_ID, CONNECT_TECH_WHITE_HEAT_ID) },
      { USB_DEVICE(CONNECT_TECH_VENDOR_ID, CONNECT_TECH_FAKE_WHITE_HEAT_ID) },
      { }                                 /* Terminating entry */
};

MODULE_DEVICE_TABLE (usb, id_table_combined);

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

/* function prototypes for the Connect Tech WhiteHEAT prerenumeration device */
static int  whiteheat_firmware_download   (struct usb_serial *serial, const struct usb_device_id *id);
static int  whiteheat_firmware_attach     (struct usb_serial *serial);

/* function prototypes for the Connect Tech WhiteHEAT serial converter */
static int  whiteheat_attach        (struct usb_serial *serial);
static void whiteheat_shutdown            (struct usb_serial *serial);
static int  whiteheat_open          (struct usb_serial_port *port, struct file *filp);
static void whiteheat_close         (struct usb_serial_port *port, struct file *filp);
static int  whiteheat_write         (struct usb_serial_port *port, const unsigned char *buf, int count);
static int  whiteheat_write_room    (struct usb_serial_port *port);
static int  whiteheat_ioctl         (struct usb_serial_port *port, struct file * file, unsigned int cmd, unsigned long arg);
static void whiteheat_set_termios   (struct usb_serial_port *port, struct ktermios * old);
static int  whiteheat_tiocmget            (struct usb_serial_port *port, struct file *file);
static int  whiteheat_tiocmset            (struct usb_serial_port *port, struct file *file, unsigned int set, unsigned int clear);
static void whiteheat_break_ctl           (struct usb_serial_port *port, int break_state);
static int  whiteheat_chars_in_buffer     (struct usb_serial_port *port);
static void whiteheat_throttle            (struct usb_serial_port *port);
static void whiteheat_unthrottle    (struct usb_serial_port *port);
static void whiteheat_read_callback (struct urb *urb);
static void whiteheat_write_callback      (struct urb *urb);

static struct usb_serial_driver whiteheat_fake_device = {
      .driver = {
            .owner =    THIS_MODULE,
            .name =           "whiteheatnofirm",
      },
      .description =          "Connect Tech - WhiteHEAT - (prerenumeration)",
      .usb_driver =           &whiteheat_driver,
      .id_table =       id_table_prerenumeration,
      .num_interrupt_in =     NUM_DONT_CARE,
      .num_bulk_in =          NUM_DONT_CARE,
      .num_bulk_out =         NUM_DONT_CARE,
      .num_ports =            1,
      .probe =          whiteheat_firmware_download,
      .attach =         whiteheat_firmware_attach,
};

static struct usb_serial_driver whiteheat_device = {
      .driver = {
            .owner =    THIS_MODULE,
            .name =           "whiteheat",
      },
      .description =          "Connect Tech - WhiteHEAT",
      .usb_driver =           &whiteheat_driver,
      .id_table =       id_table_std,
      .num_interrupt_in =     NUM_DONT_CARE,
      .num_bulk_in =          NUM_DONT_CARE,
      .num_bulk_out =         NUM_DONT_CARE,
      .num_ports =            4,
      .attach =         whiteheat_attach,
      .shutdown =       whiteheat_shutdown,
      .open =                 whiteheat_open,
      .close =          whiteheat_close,
      .write =          whiteheat_write,
      .write_room =           whiteheat_write_room,
      .ioctl =          whiteheat_ioctl,
      .set_termios =          whiteheat_set_termios,
      .break_ctl =            whiteheat_break_ctl,
      .tiocmget =       whiteheat_tiocmget,
      .tiocmset =       whiteheat_tiocmset,
      .chars_in_buffer =      whiteheat_chars_in_buffer,
      .throttle =       whiteheat_throttle,
      .unthrottle =           whiteheat_unthrottle,
      .read_bulk_callback =   whiteheat_read_callback,
      .write_bulk_callback =  whiteheat_write_callback,
};


struct whiteheat_command_private {
      struct mutex            mutex;
      __u8              port_running;
      __u8              command_finished;
      wait_queue_head_t wait_command;     /* for handling sleeping while waiting for a command to finish */
      __u8              result_buffer[64];
};


#define THROTTLED       0x01
#define ACTUALLY_THROTTLED    0x02

static int urb_pool_size = 8;

struct whiteheat_urb_wrap {
      struct list_head  list;
      struct urb        *urb;
};

struct whiteheat_private {
      spinlock_t        lock;
      __u8              flags;
      __u8              mcr;
      struct list_head  rx_urbs_free;
      struct list_head  rx_urbs_submitted;
      struct list_head  rx_urb_q;
      struct work_struct      rx_work;
      struct usb_serial_port  *port;
      struct list_head  tx_urbs_free;
      struct list_head  tx_urbs_submitted;
      struct mutex            deathwarrant;
};


/* local function prototypes */
static int start_command_port(struct usb_serial *serial);
static void stop_command_port(struct usb_serial *serial);
static void command_port_write_callback(struct urb *urb);
static void command_port_read_callback(struct urb *urb);

static int start_port_read(struct usb_serial_port *port);
static struct whiteheat_urb_wrap *urb_to_wrap(struct urb *urb, struct list_head *head);
static struct list_head *list_first(struct list_head *head);
static void rx_data_softint(struct work_struct *work);

static int firm_send_command(struct usb_serial_port *port, __u8 command, __u8 *data, __u8 datasize);
static int firm_open(struct usb_serial_port *port);
static int firm_close(struct usb_serial_port *port);
static int firm_setup_port(struct usb_serial_port *port);
static int firm_set_rts(struct usb_serial_port *port, __u8 onoff);
static int firm_set_dtr(struct usb_serial_port *port, __u8 onoff);
static int firm_set_break(struct usb_serial_port *port, __u8 onoff);
static int firm_purge(struct usb_serial_port *port, __u8 rxtx);
static int firm_get_dtr_rts(struct usb_serial_port *port);
static int firm_report_tx_done(struct usb_serial_port *port);


#define COMMAND_PORT          4
#define COMMAND_TIMEOUT       (2*HZ)      /* 2 second timeout for a command */
#define     COMMAND_TIMEOUT_MS      2000
#define CLOSING_DELAY         (30 * HZ)


/*****************************************************************************
 * Connect Tech's White Heat prerenumeration driver functions
 *****************************************************************************/

/* steps to download the firmware to the WhiteHEAT device:
 - hold the reset (by writing to the reset bit of the CPUCS register)
 - download the VEND_AX.HEX file to the chip using VENDOR_REQUEST-ANCHOR_LOAD
 - release the reset (by writing to the CPUCS register)
 - download the WH.HEX file for all addresses greater than 0x1b3f using
   VENDOR_REQUEST-ANCHOR_EXTERNAL_RAM_LOAD
 - hold the reset
 - download the WH.HEX file for all addresses less than 0x1b40 using
   VENDOR_REQUEST_ANCHOR_LOAD
 - release the reset
 - device renumerated itself and comes up as new device id with all
   firmware download completed.
*/
static int whiteheat_firmware_download (struct usb_serial *serial, const struct usb_device_id *id)
{
      int response;
      const struct whiteheat_hex_record *record;
      
      dbg("%s", __FUNCTION__);
      
      response = ezusb_set_reset (serial, 1);

      record = &whiteheat_loader[0];
      while (record->address != 0xffff) {
            response = ezusb_writememory (serial, record->address, 
                        (unsigned char *)record->data, record->data_size, 0xa0);
            if (response < 0) {
                  err("%s - ezusb_writememory failed for loader (%d %04X %p %d)",
                        __FUNCTION__, response, record->address, record->data, record->data_size);
                  break;
            }
            ++record;
      }

      response = ezusb_set_reset (serial, 0);

      record = &whiteheat_firmware[0];
      while (record->address < 0x1b40) {
            ++record;
      }
      while (record->address != 0xffff) {
            response = ezusb_writememory (serial, record->address, 
                        (unsigned char *)record->data, record->data_size, 0xa3);
            if (response < 0) {
                  err("%s - ezusb_writememory failed for first firmware step (%d %04X %p %d)", 
                        __FUNCTION__, response, record->address, record->data, record->data_size);
                  break;
            }
            ++record;
      }
      
      response = ezusb_set_reset (serial, 1);

      record = &whiteheat_firmware[0];
      while (record->address < 0x1b40) {
            response = ezusb_writememory (serial, record->address, 
                        (unsigned char *)record->data, record->data_size, 0xa0);
            if (response < 0) {
                  err("%s - ezusb_writememory failed for second firmware step (%d %04X %p %d)", 
                        __FUNCTION__, response, record->address, record->data, record->data_size);
                  break;
            }
            ++record;
      }

      response = ezusb_set_reset (serial, 0);

      return 0;
}


static int whiteheat_firmware_attach (struct usb_serial *serial)
{
      /* We want this device to fail to have a driver assigned to it */
      return 1;
}


/*****************************************************************************
 * Connect Tech's White Heat serial driver functions
 *****************************************************************************/
static int whiteheat_attach (struct usb_serial *serial)
{
      struct usb_serial_port *command_port;
      struct whiteheat_command_private *command_info;
      struct usb_serial_port *port;
      struct whiteheat_private *info;
      struct whiteheat_hw_info *hw_info;
      int pipe;
      int ret;
      int alen;
      __u8 *command;
      __u8 *result;
      int i;
      int j;
      struct urb *urb;
      int buf_size;
      struct whiteheat_urb_wrap *wrap;
      struct list_head *tmp;

      command_port = serial->port[COMMAND_PORT];

      pipe = usb_sndbulkpipe (serial->dev, command_port->bulk_out_endpointAddress);
      command = kmalloc(2, GFP_KERNEL);
      if (!command)
            goto no_command_buffer;
      command[0] = WHITEHEAT_GET_HW_INFO;
      command[1] = 0;
      
      result = kmalloc(sizeof(*hw_info) + 1, GFP_KERNEL);
      if (!result)
            goto no_result_buffer;
      /*
       * When the module is reloaded the firmware is still there and
       * the endpoints are still in the usb core unchanged. This is the
         * unlinking bug in disguise. Same for the call below.
         */
      usb_clear_halt(serial->dev, pipe);
      ret = usb_bulk_msg (serial->dev, pipe, command, 2, &alen, COMMAND_TIMEOUT_MS);
      if (ret) {
            err("%s: Couldn't send command [%d]", serial->type->description, ret);
            goto no_firmware;
      } else if (alen != 2) {
            err("%s: Send command incomplete [%d]", serial->type->description, alen);
            goto no_firmware;
      }

      pipe = usb_rcvbulkpipe (serial->dev, command_port->bulk_in_endpointAddress);
      /* See the comment on the usb_clear_halt() above */
      usb_clear_halt(serial->dev, pipe);
      ret = usb_bulk_msg (serial->dev, pipe, result, sizeof(*hw_info) + 1, &alen, COMMAND_TIMEOUT_MS);
      if (ret) {
            err("%s: Couldn't get results [%d]", serial->type->description, ret);
            goto no_firmware;
      } else if (alen != sizeof(*hw_info) + 1) {
            err("%s: Get results incomplete [%d]", serial->type->description, alen);
            goto no_firmware;
      } else if (result[0] != command[0]) {
            err("%s: Command failed [%d]", serial->type->description, result[0]);
            goto no_firmware;
      }

      hw_info = (struct whiteheat_hw_info *)&result[1];

      info("%s: Driver %s: Firmware v%d.%02d", serial->type->description,
           DRIVER_VERSION, hw_info->sw_major_rev, hw_info->sw_minor_rev);

      for (i = 0; i < serial->num_ports; i++) {
            port = serial->port[i];

            info = kmalloc(sizeof(struct whiteheat_private), GFP_KERNEL);
            if (info == NULL) {
                  err("%s: Out of memory for port structures\n", serial->type->description);
                  goto no_private;
            }

            spin_lock_init(&info->lock);
            mutex_init(&info->deathwarrant);
            info->flags = 0;
            info->mcr = 0;
            INIT_WORK(&info->rx_work, rx_data_softint);
            info->port = port;

            INIT_LIST_HEAD(&info->rx_urbs_free);
            INIT_LIST_HEAD(&info->rx_urbs_submitted);
            INIT_LIST_HEAD(&info->rx_urb_q);
            INIT_LIST_HEAD(&info->tx_urbs_free);
            INIT_LIST_HEAD(&info->tx_urbs_submitted);

            for (j = 0; j < urb_pool_size; j++) {
                  urb = usb_alloc_urb(0, GFP_KERNEL);
                  if (!urb) {
                        err("No free urbs available");
                        goto no_rx_urb;
                  }
                  buf_size = port->read_urb->transfer_buffer_length;
                  urb->transfer_buffer = kmalloc(buf_size, GFP_KERNEL);
                  if (!urb->transfer_buffer) {
                        err("Couldn't allocate urb buffer");
                        goto no_rx_buf;
                  }
                  wrap = kmalloc(sizeof(*wrap), GFP_KERNEL);
                  if (!wrap) {
                        err("Couldn't allocate urb wrapper");
                        goto no_rx_wrap;
                  }
                  usb_fill_bulk_urb(urb, serial->dev,
                              usb_rcvbulkpipe(serial->dev,
                                    port->bulk_in_endpointAddress),
                              urb->transfer_buffer, buf_size,
                              whiteheat_read_callback, port);
                  wrap->urb = urb;
                  list_add(&wrap->list, &info->rx_urbs_free);

                  urb = usb_alloc_urb(0, GFP_KERNEL);
                  if (!urb) {
                        err("No free urbs available");
                        goto no_tx_urb;
                  }
                  buf_size = port->write_urb->transfer_buffer_length;
                  urb->transfer_buffer = kmalloc(buf_size, GFP_KERNEL);
                  if (!urb->transfer_buffer) {
                        err("Couldn't allocate urb buffer");
                        goto no_tx_buf;
                  }
                  wrap = kmalloc(sizeof(*wrap), GFP_KERNEL);
                  if (!wrap) {
                        err("Couldn't allocate urb wrapper");
                        goto no_tx_wrap;
                  }
                  usb_fill_bulk_urb(urb, serial->dev,
                              usb_sndbulkpipe(serial->dev,
                                    port->bulk_out_endpointAddress),
                              urb->transfer_buffer, buf_size,
                              whiteheat_write_callback, port);
                  wrap->urb = urb;
                  list_add(&wrap->list, &info->tx_urbs_free);
            }

            usb_set_serial_port_data(port, info);
      }

      command_info = kmalloc(sizeof(struct whiteheat_command_private), GFP_KERNEL);
      if (command_info == NULL) {
            err("%s: Out of memory for port structures\n", serial->type->description);
            goto no_command_private;
      }

      mutex_init(&command_info->mutex);
      command_info->port_running = 0;
      init_waitqueue_head(&command_info->wait_command);
      usb_set_serial_port_data(command_port, command_info);
      command_port->write_urb->complete = command_port_write_callback;
      command_port->read_urb->complete = command_port_read_callback;
      kfree(result);
      kfree(command);

      return 0;

no_firmware:
      /* Firmware likely not running */
      err("%s: Unable to retrieve firmware version, try replugging\n", serial->type->description);
      err("%s: If the firmware is not running (status led not blinking)\n", serial->type->description);
      err("%s: please contact support@connecttech.com\n", serial->type->description);
      kfree(result);
      return -ENODEV;

no_command_private:
      for (i = serial->num_ports - 1; i >= 0; i--) {
            port = serial->port[i];
            info = usb_get_serial_port_data(port);
            for (j = urb_pool_size - 1; j >= 0; j--) {
                  tmp = list_first(&info->tx_urbs_free);
                  list_del(tmp);
                  wrap = list_entry(tmp, struct whiteheat_urb_wrap, list);
                  urb = wrap->urb;
                  kfree(wrap);
no_tx_wrap:
                  kfree(urb->transfer_buffer);
no_tx_buf:
                  usb_free_urb(urb);
no_tx_urb:
                  tmp = list_first(&info->rx_urbs_free);
                  list_del(tmp);
                  wrap = list_entry(tmp, struct whiteheat_urb_wrap, list);
                  urb = wrap->urb;
                  kfree(wrap);
no_rx_wrap:
                  kfree(urb->transfer_buffer);
no_rx_buf:
                  usb_free_urb(urb);
no_rx_urb:
                  ;
            }
            kfree(info);
no_private:
            ;
      }
      kfree(result);
no_result_buffer:
      kfree(command);
no_command_buffer:
      return -ENOMEM;
}


static void whiteheat_shutdown (struct usb_serial *serial)
{
      struct usb_serial_port *command_port;
      struct usb_serial_port *port;
      struct whiteheat_private *info;
      struct whiteheat_urb_wrap *wrap;
      struct urb *urb;
      struct list_head *tmp;
      struct list_head *tmp2;
      int i;

      dbg("%s", __FUNCTION__);

      /* free up our private data for our command port */
      command_port = serial->port[COMMAND_PORT];
      kfree (usb_get_serial_port_data(command_port));

      for (i = 0; i < serial->num_ports; i++) {
            port = serial->port[i];
            info = usb_get_serial_port_data(port);
            list_for_each_safe(tmp, tmp2, &info->rx_urbs_free) {
                  list_del(tmp);
                  wrap = list_entry(tmp, struct whiteheat_urb_wrap, list);
                  urb = wrap->urb;
                  kfree(wrap);
                  kfree(urb->transfer_buffer);
                  usb_free_urb(urb);
            }
            list_for_each_safe(tmp, tmp2, &info->tx_urbs_free) {
                  list_del(tmp);
                  wrap = list_entry(tmp, struct whiteheat_urb_wrap, list);
                  urb = wrap->urb;
                  kfree(wrap);
                  kfree(urb->transfer_buffer);
                  usb_free_urb(urb);
            }
            kfree(info);
      }

      return;
}


static int whiteheat_open (struct usb_serial_port *port, struct file *filp)
{
      int         retval = 0;
      struct ktermios   old_term;

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

      retval = start_command_port(port->serial);
      if (retval)
            goto exit;

      if (port->tty)
            port->tty->low_latency = 1;

      /* send an open port command */
      retval = firm_open(port);
      if (retval) {
            stop_command_port(port->serial);
            goto exit;
      }

      retval = firm_purge(port, WHITEHEAT_PURGE_RX | WHITEHEAT_PURGE_TX);
      if (retval) {
            firm_close(port);
            stop_command_port(port->serial);
            goto exit;
      }

      old_term.c_cflag = ~port->tty->termios->c_cflag;
      old_term.c_iflag = ~port->tty->termios->c_iflag;
      whiteheat_set_termios(port, &old_term);

      /* Work around HCD bugs */
      usb_clear_halt(port->serial->dev, port->read_urb->pipe);
      usb_clear_halt(port->serial->dev, port->write_urb->pipe);

      /* Start reading from the device */
      retval = start_port_read(port);
      if (retval) {
            err("%s - failed submitting read urb, error %d", __FUNCTION__, retval);
            firm_close(port);
            stop_command_port(port->serial);
            goto exit;
      }

exit:
      dbg("%s - exit, retval = %d", __FUNCTION__, retval);
      return retval;
}


static void whiteheat_close(struct usb_serial_port *port, struct file * filp)
{
      struct whiteheat_private *info = usb_get_serial_port_data(port);
      struct whiteheat_urb_wrap *wrap;
      struct urb *urb;
      struct list_head *tmp;
      struct list_head *tmp2;

      dbg("%s - port %d", __FUNCTION__, port->number);
      
      /* filp is NULL when called from usb_serial_disconnect */
      if (filp && (tty_hung_up_p(filp))) {
            return;
      }

      port->tty->closing = 1;

/*
 * Not currently in use; tty_wait_until_sent() calls
 * serial_chars_in_buffer() which deadlocks on the second semaphore
 * acquisition. This should be fixed at some point. Greg's been
 * notified.
      if ((filp->f_flags & (O_NDELAY | O_NONBLOCK)) == 0) {
            tty_wait_until_sent(port->tty, CLOSING_DELAY);
      }
*/

      if (port->tty->driver->flush_buffer)
            port->tty->driver->flush_buffer(port->tty);
      tty_ldisc_flush(port->tty);

      firm_report_tx_done(port);

      firm_close(port);

printk(KERN_ERR"Before processing rx_urbs_submitted.\n");
      /* shutdown our bulk reads and writes */
      mutex_lock(&info->deathwarrant);
      spin_lock_irq(&info->lock);
      list_for_each_safe(tmp, tmp2, &info->rx_urbs_submitted) {
            wrap = list_entry(tmp, struct whiteheat_urb_wrap, list);
            urb = wrap->urb;
            list_del(tmp);
            spin_unlock_irq(&info->lock);
            usb_kill_urb(urb);
            spin_lock_irq(&info->lock);
            list_add(tmp, &info->rx_urbs_free);
      }
      list_for_each_safe(tmp, tmp2, &info->rx_urb_q)
            list_move(tmp, &info->rx_urbs_free);
      list_for_each_safe(tmp, tmp2, &info->tx_urbs_submitted) {
            wrap = list_entry(tmp, struct whiteheat_urb_wrap, list);
            urb = wrap->urb;
            list_del(tmp);
            spin_unlock_irq(&info->lock);
            usb_kill_urb(urb);
            spin_lock_irq(&info->lock);
            list_add(tmp, &info->tx_urbs_free);
      }
      spin_unlock_irq(&info->lock);
      mutex_unlock(&info->deathwarrant);

      stop_command_port(port->serial);

      port->tty->closing = 0;
}


static int whiteheat_write(struct usb_serial_port *port, const unsigned char *buf, int count)
{
      struct usb_serial *serial = port->serial;
      struct whiteheat_private *info = usb_get_serial_port_data(port);
      struct whiteheat_urb_wrap *wrap;
      struct urb *urb;
      int result;
      int bytes;
      int sent = 0;
      unsigned long flags;
      struct list_head *tmp;

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

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

      while (count) {
            spin_lock_irqsave(&info->lock, flags);
            if (list_empty(&info->tx_urbs_free)) {
                  spin_unlock_irqrestore(&info->lock, flags);
                  break;
            }
            tmp = list_first(&info->tx_urbs_free);
            list_del(tmp);
            spin_unlock_irqrestore(&info->lock, flags);

            wrap = list_entry(tmp, struct whiteheat_urb_wrap, list);
            urb = wrap->urb;
            bytes = (count > port->bulk_out_size) ? port->bulk_out_size : count;
            memcpy (urb->transfer_buffer, buf + sent, bytes);

            usb_serial_debug_data(debug, &port->dev, __FUNCTION__, bytes, urb->transfer_buffer);

            urb->dev = serial->dev;
            urb->transfer_buffer_length = bytes;
            result = usb_submit_urb(urb, GFP_ATOMIC);
            if (result) {
                  err("%s - failed submitting write urb, error %d", __FUNCTION__, result);
                  sent = result;
                  spin_lock_irqsave(&info->lock, flags);
                  list_add(tmp, &info->tx_urbs_free);
                  spin_unlock_irqrestore(&info->lock, flags);
                  break;
            } else {
                  sent += bytes;
                  count -= bytes;
                  spin_lock_irqsave(&info->lock, flags);
                  list_add(tmp, &info->tx_urbs_submitted);
                  spin_unlock_irqrestore(&info->lock, flags);
            }
      }

      return sent;
}


static int whiteheat_write_room(struct usb_serial_port *port)
{
      struct whiteheat_private *info = usb_get_serial_port_data(port);
      struct list_head *tmp;
      int room = 0;
      unsigned long flags;

      dbg("%s - port %d", __FUNCTION__, port->number);
      
      spin_lock_irqsave(&info->lock, flags);
      list_for_each(tmp, &info->tx_urbs_free)
            room++;
      spin_unlock_irqrestore(&info->lock, flags);
      room *= port->bulk_out_size;

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


static int whiteheat_tiocmget (struct usb_serial_port *port, struct file *file)
{
      struct whiteheat_private *info = usb_get_serial_port_data(port);
      unsigned int modem_signals = 0;

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

      firm_get_dtr_rts(port);
      if (info->mcr & UART_MCR_DTR)
            modem_signals |= TIOCM_DTR;
      if (info->mcr & UART_MCR_RTS)
            modem_signals |= TIOCM_RTS;

      return modem_signals;
}


static int whiteheat_tiocmset (struct usb_serial_port *port, struct file *file,
                         unsigned int set, unsigned int clear)
{
      struct whiteheat_private *info = usb_get_serial_port_data(port);

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

      if (set & TIOCM_RTS)
            info->mcr |= UART_MCR_RTS;
      if (set & TIOCM_DTR)
            info->mcr |= UART_MCR_DTR;

      if (clear & TIOCM_RTS)
            info->mcr &= ~UART_MCR_RTS;
      if (clear & TIOCM_DTR)
            info->mcr &= ~UART_MCR_DTR;

      firm_set_dtr(port, info->mcr & UART_MCR_DTR);
      firm_set_rts(port, info->mcr & UART_MCR_RTS);
      return 0;
}


static int whiteheat_ioctl (struct usb_serial_port *port, struct file * file, unsigned int cmd, unsigned long arg)
{
      struct serial_struct serstruct;
      void __user *user_arg = (void __user *)arg;

      dbg("%s - port %d, cmd 0x%.4x", __FUNCTION__, port->number, cmd);

      switch (cmd) {
            case TIOCGSERIAL:
                  memset(&serstruct, 0, sizeof(serstruct));
                  serstruct.type = PORT_16654;
                  serstruct.line = port->serial->minor;
                  serstruct.port = port->number;
                  serstruct.flags = ASYNC_SKIP_TEST | ASYNC_AUTO_IRQ;
                  serstruct.xmit_fifo_size = port->bulk_out_size;
                  serstruct.custom_divisor = 0;
                  serstruct.baud_base = 460800;
                  serstruct.close_delay = CLOSING_DELAY;
                  serstruct.closing_wait = CLOSING_DELAY;

                  if (copy_to_user(user_arg, &serstruct, sizeof(serstruct)))
                        return -EFAULT;

                  break;

            case TIOCSSERIAL:
                  if (copy_from_user(&serstruct, user_arg, sizeof(serstruct)))
                        return -EFAULT;

                  /*
                   * For now this is ignored. dip sets the ASYNC_[V]HI flags
                   * but this isn't used by us at all. Maybe someone somewhere
                   * will need the custom_divisor setting.
                   */

                  break;

            default:
                  break;
      }

      return -ENOIOCTLCMD;
}


static void whiteheat_set_termios(struct usb_serial_port *port, struct ktermios *old_termios)
{
      dbg("%s -port %d", __FUNCTION__, port->number);
      firm_setup_port(port);
}


static void whiteheat_break_ctl(struct usb_serial_port *port, int break_state) {
      firm_set_break(port, break_state);
}


static int whiteheat_chars_in_buffer(struct usb_serial_port *port)
{
      struct whiteheat_private *info = usb_get_serial_port_data(port);
      struct list_head *tmp;
      struct whiteheat_urb_wrap *wrap;
      int chars = 0;
      unsigned long flags;

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

      spin_lock_irqsave(&info->lock, flags);
      list_for_each(tmp, &info->tx_urbs_submitted) {
            wrap = list_entry(tmp, struct whiteheat_urb_wrap, list);
            chars += wrap->urb->transfer_buffer_length;
      }
      spin_unlock_irqrestore(&info->lock, flags);

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


static void whiteheat_throttle (struct usb_serial_port *port)
{
      struct whiteheat_private *info = usb_get_serial_port_data(port);
      unsigned long flags;

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

      spin_lock_irqsave(&info->lock, flags);
      info->flags |= THROTTLED;
      spin_unlock_irqrestore(&info->lock, flags);

      return;
}


static void whiteheat_unthrottle (struct usb_serial_port *port)
{
      struct whiteheat_private *info = usb_get_serial_port_data(port);
      int actually_throttled;
      unsigned long flags;

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

      spin_lock_irqsave(&info->lock, flags);
      actually_throttled = info->flags & ACTUALLY_THROTTLED;
      info->flags &= ~(THROTTLED | ACTUALLY_THROTTLED);
      spin_unlock_irqrestore(&info->lock, flags);

      if (actually_throttled)
            rx_data_softint(&info->rx_work);

      return;
}


/*****************************************************************************
 * Connect Tech's White Heat callback routines
 *****************************************************************************/
static void command_port_write_callback(struct urb *urb)
{
      int status = urb->status;

      dbg("%s", __FUNCTION__);

      if (status) {
            dbg("nonzero urb status: %d", status);
            return;
      }
}


static void command_port_read_callback(struct urb *urb)
{
      struct usb_serial_port *command_port = (struct usb_serial_port *)urb->context;
      struct whiteheat_command_private *command_info;
      int status = urb->status;
      unsigned char *data = urb->transfer_buffer;
      int result;

      dbg("%s", __FUNCTION__);

      command_info = usb_get_serial_port_data(command_port);
      if (!command_info) {
            dbg ("%s - command_info is NULL, exiting.", __FUNCTION__);
            return;
      }
      if (status) {
            dbg("%s - nonzero urb status: %d", __FUNCTION__, status);
            if (status != -ENOENT)
                  command_info->command_finished = WHITEHEAT_CMD_FAILURE;
            wake_up(&command_info->wait_command);
            return;
      }

      usb_serial_debug_data(debug, &command_port->dev, __FUNCTION__, urb->actual_length, data);

      if (data[0] == WHITEHEAT_CMD_COMPLETE) {
            command_info->command_finished = WHITEHEAT_CMD_COMPLETE;
            wake_up(&command_info->wait_command);
      } else if (data[0] == WHITEHEAT_CMD_FAILURE) {
            command_info->command_finished = WHITEHEAT_CMD_FAILURE;
            wake_up(&command_info->wait_command);
      } else if (data[0] == WHITEHEAT_EVENT) {
            /* These are unsolicited reports from the firmware, hence no waiting command to wakeup */
            dbg("%s - event received", __FUNCTION__);
      } else if (data[0] == WHITEHEAT_GET_DTR_RTS) {
            memcpy(command_info->result_buffer, &data[1], urb->actual_length - 1);
            command_info->command_finished = WHITEHEAT_CMD_COMPLETE;
            wake_up(&command_info->wait_command);
      } else {
            dbg("%s - bad reply from firmware", __FUNCTION__);
      }
      
      /* Continue trying to always read */
      command_port->read_urb->dev = command_port->serial->dev;
      result = usb_submit_urb(command_port->read_urb, GFP_ATOMIC);
      if (result)
            dbg("%s - failed resubmitting read urb, error %d", __FUNCTION__, result);
}


static void whiteheat_read_callback(struct urb *urb)
{
      struct usb_serial_port *port = (struct usb_serial_port *)urb->context;
      struct whiteheat_urb_wrap *wrap;
      unsigned char *data = urb->transfer_buffer;
      struct whiteheat_private *info = usb_get_serial_port_data(port);
      int status = urb->status;

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

      spin_lock(&info->lock);
      wrap = urb_to_wrap(urb, &info->rx_urbs_submitted);
      if (!wrap) {
            spin_unlock(&info->lock);
            err("%s - Not my urb!", __FUNCTION__);
            return;
      }
      list_del(&wrap->list);
      spin_unlock(&info->lock);

      if (status) {
            dbg("%s - nonzero read bulk status received: %d",
                __FUNCTION__, status);
            spin_lock(&info->lock);
            list_add(&wrap->list, &info->rx_urbs_free);
            spin_unlock(&info->lock);
            return;
      }

      usb_serial_debug_data(debug, &port->dev, __FUNCTION__, urb->actual_length, data);

      spin_lock(&info->lock);
      list_add_tail(&wrap->list, &info->rx_urb_q);
      if (info->flags & THROTTLED) {
            info->flags |= ACTUALLY_THROTTLED;
            spin_unlock(&info->lock);
            return;
      }
      spin_unlock(&info->lock);

      schedule_work(&info->rx_work);
}


static void whiteheat_write_callback(struct urb *urb)
{
      struct usb_serial_port *port = (struct usb_serial_port *)urb->context;
      struct whiteheat_private *info = usb_get_serial_port_data(port);
      struct whiteheat_urb_wrap *wrap;
      int status = urb->status;

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

      spin_lock(&info->lock);
      wrap = urb_to_wrap(urb, &info->tx_urbs_submitted);
      if (!wrap) {
            spin_unlock(&info->lock);
            err("%s - Not my urb!", __FUNCTION__);
            return;
      }
      list_move(&wrap->list, &info->tx_urbs_free);
      spin_unlock(&info->lock);

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

      usb_serial_port_softint(port);
}


/*****************************************************************************
 * Connect Tech's White Heat firmware interface
 *****************************************************************************/
static int firm_send_command(struct usb_serial_port *port, __u8 command, __u8 *data, __u8 datasize)
{
      struct usb_serial_port *command_port;
      struct whiteheat_command_private *command_info;
      struct whiteheat_private *info;
      __u8 *transfer_buffer;
      int retval = 0;
      int t;

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

      command_port = port->serial->port[COMMAND_PORT];
      command_info = usb_get_serial_port_data(command_port);
      mutex_lock(&command_info->mutex);
      command_info->command_finished = false;
      
      transfer_buffer = (__u8 *)command_port->write_urb->transfer_buffer;
      transfer_buffer[0] = command;
      memcpy (&transfer_buffer[1], data, datasize);
      command_port->write_urb->transfer_buffer_length = datasize + 1;
      command_port->write_urb->dev = port->serial->dev;
      retval = usb_submit_urb (command_port->write_urb, GFP_NOIO);
      if (retval) {
            dbg("%s - submit urb failed", __FUNCTION__);
            goto exit;
      }

      /* wait for the command to complete */
      t = wait_event_timeout(command_info->wait_command,
            (bool)command_info->command_finished, COMMAND_TIMEOUT);
      if (!t)
            usb_kill_urb(command_port->write_urb);

      if (command_info->command_finished == false) {
            dbg("%s - command timed out.", __FUNCTION__);
            retval = -ETIMEDOUT;
            goto exit;
      }

      if (command_info->command_finished == WHITEHEAT_CMD_FAILURE) {
            dbg("%s - command failed.", __FUNCTION__);
            retval = -EIO;
            goto exit;
      }

      if (command_info->command_finished == WHITEHEAT_CMD_COMPLETE) {
            dbg("%s - command completed.", __FUNCTION__);
            switch (command) {
                  case WHITEHEAT_GET_DTR_RTS:
                        info = usb_get_serial_port_data(port);
                        memcpy(&info->mcr, command_info->result_buffer, sizeof(struct whiteheat_dr_info));
                        break;
            }
      }

exit:
      mutex_unlock(&command_info->mutex);
      return retval;
}


static int firm_open(struct usb_serial_port *port) {
      struct whiteheat_simple open_command;

      open_command.port = port->number - port->serial->minor + 1;
      return firm_send_command(port, WHITEHEAT_OPEN, (__u8 *)&open_command, sizeof(open_command));
}


static int firm_close(struct usb_serial_port *port) {
      struct whiteheat_simple close_command;

      close_command.port = port->number - port->serial->minor + 1;
      return firm_send_command(port, WHITEHEAT_CLOSE, (__u8 *)&close_command, sizeof(close_command));
}


static int firm_setup_port(struct usb_serial_port *port) {
      struct whiteheat_port_settings port_settings;
      unsigned int cflag = port->tty->termios->c_cflag;

      port_settings.port = port->number + 1;

      /* get the byte size */
      switch (cflag & CSIZE) {
            case CS5:   port_settings.bits = 5;   break;
            case CS6:   port_settings.bits = 6;   break;
            case CS7:   port_settings.bits = 7;   break;
            default:
            case CS8:   port_settings.bits = 8;   break;
      }
      dbg("%s - data bits = %d", __FUNCTION__, port_settings.bits);
      
      /* determine the parity */
      if (cflag & PARENB)
            if (cflag & CMSPAR)
                  if (cflag & PARODD)
                        port_settings.parity = WHITEHEAT_PAR_MARK;
                  else
                        port_settings.parity = WHITEHEAT_PAR_SPACE;
            else
                  if (cflag & PARODD)
                        port_settings.parity = WHITEHEAT_PAR_ODD;
                  else
                        port_settings.parity = WHITEHEAT_PAR_EVEN;
      else
            port_settings.parity = WHITEHEAT_PAR_NONE;
      dbg("%s - parity = %c", __FUNCTION__, port_settings.parity);

      /* figure out the stop bits requested */
      if (cflag & CSTOPB)
            port_settings.stop = 2;
      else
            port_settings.stop = 1;
      dbg("%s - stop bits = %d", __FUNCTION__, port_settings.stop);

      /* figure out the flow control settings */
      if (cflag & CRTSCTS)
            port_settings.hflow = (WHITEHEAT_HFLOW_CTS | WHITEHEAT_HFLOW_RTS);
      else
            port_settings.hflow = WHITEHEAT_HFLOW_NONE;
      dbg("%s - hardware flow control = %s %s %s %s", __FUNCTION__,
          (port_settings.hflow & WHITEHEAT_HFLOW_CTS) ? "CTS" : "",
          (port_settings.hflow & WHITEHEAT_HFLOW_RTS) ? "RTS" : "",
          (port_settings.hflow & WHITEHEAT_HFLOW_DSR) ? "DSR" : "",
          (port_settings.hflow & WHITEHEAT_HFLOW_DTR) ? "DTR" : "");
      
      /* determine software flow control */
      if (I_IXOFF(port->tty))
            port_settings.sflow = WHITEHEAT_SFLOW_RXTX;
      else
            port_settings.sflow = WHITEHEAT_SFLOW_NONE;
      dbg("%s - software flow control = %c", __FUNCTION__, port_settings.sflow);
      
      port_settings.xon = START_CHAR(port->tty);
      port_settings.xoff = STOP_CHAR(port->tty);
      dbg("%s - XON = %2x, XOFF = %2x", __FUNCTION__, port_settings.xon, port_settings.xoff);

      /* get the baud rate wanted */
      port_settings.baud = tty_get_baud_rate(port->tty);
      dbg("%s - baud rate = %d", __FUNCTION__, port_settings.baud);

      /* fixme: should set validated settings */
      tty_encode_baud_rate(port->tty, port_settings.baud, port_settings.baud);
      /* handle any settings that aren't specified in the tty structure */
      port_settings.lloop = 0;
      
      /* now send the message to the device */
      return firm_send_command(port, WHITEHEAT_SETUP_PORT, (__u8 *)&port_settings, sizeof(port_settings));
}


static int firm_set_rts(struct usb_serial_port *port, __u8 onoff) {
      struct whiteheat_set_rdb rts_command;

      rts_command.port = port->number - port->serial->minor + 1;
      rts_command.state = onoff;
      return firm_send_command(port, WHITEHEAT_SET_RTS, (__u8 *)&rts_command, sizeof(rts_command));
}


static int firm_set_dtr(struct usb_serial_port *port, __u8 onoff) {
      struct whiteheat_set_rdb dtr_command;

      dtr_command.port = port->number - port->serial->minor + 1;
      dtr_command.state = onoff;
      return firm_send_command(port, WHITEHEAT_SET_RTS, (__u8 *)&dtr_command, sizeof(dtr_command));
}


static int firm_set_break(struct usb_serial_port *port, __u8 onoff) {
      struct whiteheat_set_rdb break_command;

      break_command.port = port->number - port->serial->minor + 1;
      break_command.state = onoff;
      return firm_send_command(port, WHITEHEAT_SET_RTS, (__u8 *)&break_command, sizeof(break_command));
}


static int firm_purge(struct usb_serial_port *port, __u8 rxtx) {
      struct whiteheat_purge purge_command;

      purge_command.port = port->number - port->serial->minor + 1;
      purge_command.what = rxtx;
      return firm_send_command(port, WHITEHEAT_PURGE, (__u8 *)&purge_command, sizeof(purge_command));
}


static int firm_get_dtr_rts(struct usb_serial_port *port) {
      struct whiteheat_simple get_dr_command;

      get_dr_command.port = port->number - port->serial->minor + 1;
      return firm_send_command(port, WHITEHEAT_GET_DTR_RTS, (__u8 *)&get_dr_command, sizeof(get_dr_command));
}


static int firm_report_tx_done(struct usb_serial_port *port) {
      struct whiteheat_simple close_command;

      close_command.port = port->number - port->serial->minor + 1;
      return firm_send_command(port, WHITEHEAT_REPORT_TX_DONE, (__u8 *)&close_command, sizeof(close_command));
}


/*****************************************************************************
 * Connect Tech's White Heat utility functions
 *****************************************************************************/
static int start_command_port(struct usb_serial *serial)
{
      struct usb_serial_port *command_port;
      struct whiteheat_command_private *command_info;
      int retval = 0;
      
      command_port = serial->port[COMMAND_PORT];
      command_info = usb_get_serial_port_data(command_port);
      mutex_lock(&command_info->mutex);
      if (!command_info->port_running) {
            /* Work around HCD bugs */
            usb_clear_halt(serial->dev, command_port->read_urb->pipe);

            command_port->read_urb->dev = serial->dev;
            retval = usb_submit_urb(command_port->read_urb, GFP_KERNEL);
            if (retval) {
                  err("%s - failed submitting read urb, error %d", __FUNCTION__, retval);
                  goto exit;
            }
      }
      command_info->port_running++;

exit:
      mutex_unlock(&command_info->mutex);
      return retval;
}


static void stop_command_port(struct usb_serial *serial)
{
      struct usb_serial_port *command_port;
      struct whiteheat_command_private *command_info;

      command_port = serial->port[COMMAND_PORT];
      command_info = usb_get_serial_port_data(command_port);
      mutex_lock(&command_info->mutex);
      command_info->port_running--;
      if (!command_info->port_running)
            usb_kill_urb(command_port->read_urb);
      mutex_unlock(&command_info->mutex);
}


static int start_port_read(struct usb_serial_port *port)
{
      struct whiteheat_private *info = usb_get_serial_port_data(port);
      struct whiteheat_urb_wrap *wrap;
      struct urb *urb;
      int retval = 0;
      unsigned long flags;
      struct list_head *tmp;
      struct list_head *tmp2;

      spin_lock_irqsave(&info->lock, flags);

      list_for_each_safe(tmp, tmp2, &info->rx_urbs_free) {
            list_del(tmp);
            wrap = list_entry(tmp, struct whiteheat_urb_wrap, list);
            urb = wrap->urb;
            urb->dev = port->serial->dev;
            spin_unlock_irqrestore(&info->lock, flags);
            retval = usb_submit_urb(urb, GFP_KERNEL);
            if (retval) {
                  spin_lock_irqsave(&info->lock, flags);
                  list_add(tmp, &info->rx_urbs_free);
                  list_for_each_safe(tmp, tmp2, &info->rx_urbs_submitted) {
                        wrap = list_entry(tmp, struct whiteheat_urb_wrap, list);
                        urb = wrap->urb;
                        list_del(tmp);
                        spin_unlock_irqrestore(&info->lock, flags);
                        usb_kill_urb(urb);
                        spin_lock_irqsave(&info->lock, flags);
                        list_add(tmp, &info->rx_urbs_free);
                  }
                  break;
            }
            spin_lock_irqsave(&info->lock, flags);
            list_add(tmp, &info->rx_urbs_submitted);
      }

      spin_unlock_irqrestore(&info->lock, flags);

      return retval;
}


static struct whiteheat_urb_wrap *urb_to_wrap(struct urb* urb, struct list_head *head)
{
      struct whiteheat_urb_wrap *wrap;
      struct list_head *tmp;

      list_for_each(tmp, head) {
            wrap = list_entry(tmp, struct whiteheat_urb_wrap, list);
            if (wrap->urb == urb)
                  return wrap;
      }

      return NULL;
}


static struct list_head *list_first(struct list_head *head)
{
      return head->next;
}


static void rx_data_softint(struct work_struct *work)
{
      struct whiteheat_private *info =
            container_of(work, struct whiteheat_private, rx_work);
      struct usb_serial_port *port = info->port;
      struct tty_struct *tty = port->tty;
      struct whiteheat_urb_wrap *wrap;
      struct urb *urb;
      unsigned long flags;
      struct list_head *tmp;
      struct list_head *tmp2;
      int result;
      int sent = 0;

      spin_lock_irqsave(&info->lock, flags);
      if (info->flags & THROTTLED) {
            spin_unlock_irqrestore(&info->lock, flags);
            return;
      }

      list_for_each_safe(tmp, tmp2, &info->rx_urb_q) {
            list_del(tmp);
            spin_unlock_irqrestore(&info->lock, flags);

            wrap = list_entry(tmp, struct whiteheat_urb_wrap, list);
            urb = wrap->urb;

            if (tty && urb->actual_length) {
                  int len = tty_buffer_request_room(tty, urb->actual_length);
                  /* This stuff can go away now I suspect */
                  if (unlikely(len < urb->actual_length)) {
                        spin_lock_irqsave(&info->lock, flags);
                        list_add(tmp, &info->rx_urb_q);
                        spin_unlock_irqrestore(&info->lock, flags);
                        tty_flip_buffer_push(tty);
                        schedule_work(&info->rx_work);
                        return;
                  }
                  tty_insert_flip_string(tty, urb->transfer_buffer, len);
                  sent += len;
            }

            urb->dev = port->serial->dev;
            result = usb_submit_urb(urb, GFP_ATOMIC);
            if (result) {
                  err("%s - failed resubmitting read urb, error %d", __FUNCTION__, result);
                  spin_lock_irqsave(&info->lock, flags);
                  list_add(tmp, &info->rx_urbs_free);
                  continue;
            }

            spin_lock_irqsave(&info->lock, flags);
            list_add(tmp, &info->rx_urbs_submitted);
      }
      spin_unlock_irqrestore(&info->lock, flags);

      if (sent)
            tty_flip_buffer_push(tty);
}


/*****************************************************************************
 * Connect Tech's White Heat module functions
 *****************************************************************************/
static int __init whiteheat_init (void)
{
      int retval;
      retval = usb_serial_register(&whiteheat_fake_device);
      if (retval)
            goto failed_fake_register;
      retval = usb_serial_register(&whiteheat_device);
      if (retval)
            goto failed_device_register;
      retval = usb_register(&whiteheat_driver);
      if (retval)
            goto failed_usb_register;
      info(DRIVER_DESC " " DRIVER_VERSION);
      return 0;
failed_usb_register:
      usb_serial_deregister(&whiteheat_device);
failed_device_register:
      usb_serial_deregister(&whiteheat_fake_device);
failed_fake_register:
      return retval;
}


static void __exit whiteheat_exit (void)
{
      usb_deregister (&whiteheat_driver);
      usb_serial_deregister (&whiteheat_fake_device);
      usb_serial_deregister (&whiteheat_device);
}


module_init(whiteheat_init);
module_exit(whiteheat_exit);

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

module_param(urb_pool_size, int, 0);
MODULE_PARM_DESC(urb_pool_size, "Number of urbs to use for buffering");

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

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