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mos7720.c

/*
 * mos7720.c
 *   Controls the Moschip 7720 usb to dual port serial convertor
 *
 * Copyright 2006 Moschip Semiconductor Tech. Ltd.
 *
 * 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, version 2 of the License.
 *
 * Developed by:
 *    Vijaya Kumar <vijaykumar.gn@gmail.com>
 *    Ajay Kumar <naanuajay@yahoo.com>
 *    Gurudeva <ngurudeva@yahoo.com>
 *
 * Cleaned up from the original by:
 *    Greg Kroah-Hartman <gregkh@suse.de>
 *
 * Originally based on drivers/usb/serial/io_edgeport.c which is:
 *    Copyright (C) 2000 Inside Out Networks, All rights reserved.
 *    Copyright (C) 2001-2002 Greg Kroah-Hartman <greg@kroah.com>
 */
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/tty.h>
#include <linux/tty_driver.h>
#include <linux/tty_flip.h>
#include <linux/module.h>
#include <linux/spinlock.h>
#include <linux/serial.h>
#include <linux/serial_reg.h>
#include <linux/usb.h>
#include <linux/usb/serial.h>
#include <asm/uaccess.h>


/*
 * Version Information
 */
#define DRIVER_VERSION "1.0.0.4F"
#define DRIVER_AUTHOR "Aspire Communications pvt Ltd."
#define DRIVER_DESC "Moschip USB Serial Driver"

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

#define MOS_PORT1 0x0200
#define MOS_PORT2 0x0300
#define MOS_VENREG      0x0000
#define MOS_MAX_PORT    0x02
#define MOS_WRITE 0x0E
#define MOS_READ  0x0D

/* Interrupt Rotinue Defines  */
#define SERIAL_IIR_RLS  0x06
#define SERIAL_IIR_RDA  0x04
#define SERIAL_IIR_CTI  0x0c
#define SERIAL_IIR_THR  0x02
#define SERIAL_IIR_MS   0x00

#define NUM_URBS              16    /* URB Count */
#define URB_TRANSFER_BUFFER_SIZE    32    /* URB Size */

/* This structure holds all of the local port information */
struct moschip_port
{
      __u8  shadowLCR;        /* last LCR value received */
      __u8  shadowMCR;        /* last MCR value received */
      __u8  shadowMSR;        /* last MSR value received */
      char              open;
      struct async_icount     icount;
      struct usb_serial_port  *port;      /* loop back to the owner */
      struct urb        *write_urb_pool[NUM_URBS];
};

/* This structure holds all of the individual serial device information */
struct moschip_serial
{
      int interrupt_started;
};

static int debug;

#define USB_VENDOR_ID_MOSCHIP       0x9710
#define MOSCHIP_DEVICE_ID_7720            0x7720
#define MOSCHIP_DEVICE_ID_7715            0x7715

static struct usb_device_id moschip_port_id_table [] = {
      { USB_DEVICE(USB_VENDOR_ID_MOSCHIP,MOSCHIP_DEVICE_ID_7720) },
      { } /* terminating entry */
};
MODULE_DEVICE_TABLE(usb, moschip_port_id_table);


/*
 * mos7720_interrupt_callback
 *    this is the callback function for when we have received data on the
 *    interrupt endpoint.
 */
static void mos7720_interrupt_callback(struct urb *urb)
{
      int result;
      int length;
      int status = urb->status;
      __u8 *data;
      __u8 sp1;
      __u8 sp2;

      dbg("%s"," : Entering\n");

      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:
            dbg("%s - nonzero urb status received: %d", __FUNCTION__,
                status);
            goto exit;
      }

      length = urb->actual_length;
      data = urb->transfer_buffer;

      /* Moschip get 4 bytes
       * Byte 1 IIR Port 1 (port.number is 0)
       * Byte 2 IIR Port 2 (port.number is 1)
       * Byte 3 --------------
       * Byte 4 FIFO status for both */

      /* the above description is inverted
       *    oneukum 2007-03-14 */

      if (unlikely(length != 4)) {
            dbg("Wrong data !!!");
            return;
      }

      sp1 = data[3];
      sp2 = data[2];

      if ((sp1 | sp2) & 0x01) {
            /* No Interrupt Pending in both the ports */
            dbg("No Interrupt !!!");
      } else {
            switch (sp1 & 0x0f) {
            case SERIAL_IIR_RLS:
                  dbg("Serial Port 1: Receiver status error or address "
                      "bit detected in 9-bit mode\n");
                  break;
            case SERIAL_IIR_CTI:
                  dbg("Serial Port 1: Receiver time out");
                  break;
            case SERIAL_IIR_MS:
                  dbg("Serial Port 1: Modem status change");
                  break;
            }

            switch (sp2 & 0x0f) {
            case SERIAL_IIR_RLS:
                  dbg("Serial Port 2: Receiver status error or address "
                      "bit detected in 9-bit mode");
                  break;
            case SERIAL_IIR_CTI:
                  dbg("Serial Port 2: Receiver time out");
                  break;
            case SERIAL_IIR_MS:
                  dbg("Serial Port 2: Modem status change");
                  break;
            }
      }

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

/*
 * mos7720_bulk_in_callback
 *    this is the callback function for when we have received data on the
 *    bulk in endpoint.
 */
static void mos7720_bulk_in_callback(struct urb *urb)
{
      int retval;
      unsigned char *data ;
      struct usb_serial_port *port;
      struct moschip_port *mos7720_port;
      struct tty_struct *tty;
      int status = urb->status;

      if (status) {
            dbg("nonzero read bulk status received: %d", status);
            return;
      }

      mos7720_port = urb->context;
      if (!mos7720_port) {
            dbg("%s","NULL mos7720_port pointer \n");
            return ;
      }

      port = mos7720_port->port;

      dbg("Entering...%s", __FUNCTION__);

      data = urb->transfer_buffer;

      tty = port->tty;
      if (tty && urb->actual_length) {
            tty_buffer_request_room(tty, urb->actual_length);
            tty_insert_flip_string(tty, data, urb->actual_length);
            tty_flip_buffer_push(tty);
      }

      if (!port->read_urb) {
            dbg("URB KILLED !!!");
            return;
      }

      if (port->read_urb->status != -EINPROGRESS) {
            port->read_urb->dev = port->serial->dev;

            retval = usb_submit_urb(port->read_urb, GFP_ATOMIC);
            if (retval)
                  dbg("usb_submit_urb(read bulk) failed, retval = %d",
                      retval);
      }
}

/*
 * mos7720_bulk_out_data_callback
 *    this is the callback function for when we have finished sending serial
 *    data on the bulk out endpoint.
 */
static void mos7720_bulk_out_data_callback(struct urb *urb)
{
      struct moschip_port *mos7720_port;
      struct tty_struct *tty;
      int status = urb->status;

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

      mos7720_port = urb->context;
      if (!mos7720_port) {
            dbg("NULL mos7720_port pointer");
            return ;
      }

      dbg("Entering .........");

      tty = mos7720_port->port->tty;

      if (tty && mos7720_port->open)
            tty_wakeup(tty);
}

/*
 * send_mos_cmd
 *    this function will be used for sending command to device
 */
static int send_mos_cmd(struct usb_serial *serial, __u8 request, __u16 value,
                  __u16 index, void *data)
{
      int status;
      unsigned int pipe;
      u16 product = le16_to_cpu(serial->dev->descriptor.idProduct);
      __u8 requesttype;
      __u16 size = 0x0000;

      if (value < MOS_MAX_PORT) {
            if (product == MOSCHIP_DEVICE_ID_7715) {
                  value = value*0x100+0x100;
            } else {
                  value = value*0x100+0x200;
            }
      } else {
            value = 0x0000;
            if ((product == MOSCHIP_DEVICE_ID_7715) &&
                (index != 0x08)) {
                  dbg("serial->product== MOSCHIP_DEVICE_ID_7715");
                  //index = 0x01 ;
            }
      }

      if (request == MOS_WRITE) {
            request = (__u8)MOS_WRITE;
            requesttype = (__u8)0x40;
            value  = value + (__u16)*((unsigned char *)data);
            data = NULL;
            pipe = usb_sndctrlpipe(serial->dev, 0);
      } else {
            request = (__u8)MOS_READ;
            requesttype = (__u8)0xC0;
            size = 0x01;
            pipe = usb_rcvctrlpipe(serial->dev,0);
      }

      status = usb_control_msg(serial->dev, pipe, request, requesttype,
                         value, index, data, size, MOS_WDR_TIMEOUT);

      if (status < 0)
            dbg("Command Write failed Value %x index %x\n",value,index);

      return status;
}

static int mos7720_open(struct usb_serial_port *port, struct file * filp)
{
      struct usb_serial *serial;
      struct usb_serial_port *port0;
      struct urb *urb;
      struct moschip_serial *mos7720_serial;
      struct moschip_port *mos7720_port;
      int response;
      int port_number;
      char data;
      int allocated_urbs = 0;
      int j;

      serial = port->serial;

      mos7720_port = usb_get_serial_port_data(port);
      if (mos7720_port == NULL)
            return -ENODEV;

      port0 = serial->port[0];

      mos7720_serial = usb_get_serial_data(serial);

      if (mos7720_serial == NULL || port0 == NULL)
            return -ENODEV;

      usb_clear_halt(serial->dev, port->write_urb->pipe);
      usb_clear_halt(serial->dev, port->read_urb->pipe);

      /* Initialising the write urb pool */
      for (j = 0; j < NUM_URBS; ++j) {
            urb = usb_alloc_urb(0,GFP_KERNEL);
            mos7720_port->write_urb_pool[j] = urb;

            if (urb == NULL) {
                  err("No more urbs???");
                  continue;
            }

            urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE,
                                     GFP_KERNEL);
            if (!urb->transfer_buffer) {
                  err("%s-out of memory for urb buffers.", __FUNCTION__);
                  usb_free_urb(mos7720_port->write_urb_pool[j]);
                  mos7720_port->write_urb_pool[j] = NULL;
                  continue;
            }
            allocated_urbs++;
      }

      if (!allocated_urbs)
            return -ENOMEM;

       /* Initialize MCS7720 -- Write Init values to corresponding Registers
        *
        * Register Index
        * 1 : IER
        * 2 : FCR
        * 3 : LCR
        * 4 : MCR
        *
        * 0x08 : SP1/2 Control Reg
        */
      port_number = port->number - port->serial->minor;
      send_mos_cmd(port->serial, MOS_READ, port_number, UART_LSR, &data);
      dbg("SS::%p LSR:%x\n",mos7720_port, data);

      dbg("Check:Sending Command ..........");

      data = 0x02;
      send_mos_cmd(serial, MOS_WRITE, MOS_MAX_PORT, 0x01, &data);
      data = 0x02;
      send_mos_cmd(serial, MOS_WRITE, MOS_MAX_PORT, 0x02, &data);

      data = 0x00;
      send_mos_cmd(serial, MOS_WRITE, port_number, 0x01, &data);
      data = 0x00;
      send_mos_cmd(serial, MOS_WRITE, port_number, 0x02, &data);

      data = 0xCF;
      send_mos_cmd(serial, MOS_WRITE, port_number, 0x02, &data);
      data = 0x03;
        mos7720_port->shadowLCR  = data;
      send_mos_cmd(serial, MOS_WRITE, port_number, 0x03, &data);
      data = 0x0b;
        mos7720_port->shadowMCR  = data;
      send_mos_cmd(serial, MOS_WRITE, port_number, 0x04, &data);
      data = 0x0b;
      send_mos_cmd(serial, MOS_WRITE, port_number, 0x04, &data);

      data = 0x00;
      send_mos_cmd(serial, MOS_READ, MOS_MAX_PORT, 0x08, &data);
      data = 0x00;
      send_mos_cmd(serial, MOS_WRITE, MOS_MAX_PORT, 0x08, &data);

/*    data = 0x00;
      send_mos_cmd(serial, MOS_READ, MOS_MAX_PORT, port_number + 1, &data);
      data = 0x03;
      send_mos_cmd(serial, MOS_WRITE, MOS_MAX_PORT, port_number + 1, &data);
      data = 0x00;
      send_mos_cmd(port->serial, MOS_WRITE, MOS_MAX_PORT, port_number + 1, &data);
*/
      data = 0x00;
      send_mos_cmd(serial, MOS_READ, MOS_MAX_PORT, 0x08, &data);

      data = data | (port->number - port->serial->minor + 1);
      send_mos_cmd(serial, MOS_WRITE, MOS_MAX_PORT, 0x08, &data);

      data = 0x83;
        mos7720_port->shadowLCR  = data;
      send_mos_cmd(serial, MOS_WRITE, port_number, 0x03, &data);
      data = 0x0c;
      send_mos_cmd(serial, MOS_WRITE, port_number, 0x00, &data);
      data = 0x00;
      send_mos_cmd(serial, MOS_WRITE, port_number, 0x01, &data);
      data = 0x03;
        mos7720_port->shadowLCR  = data;
      send_mos_cmd(serial, MOS_WRITE, port_number, 0x03, &data);
      data = 0x0c;
      send_mos_cmd(serial, MOS_WRITE, port_number, 0x01, &data);
      data = 0x0c;
      send_mos_cmd(serial, MOS_WRITE, port_number, 0x01, &data);

//Matrix

      /* force low_latency on so that our tty_push actually forces *
       * the data through,otherwise it is scheduled, and with      *
       * high data rates (like with OHCI) data can get lost.       */

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

      /* see if we've set up our endpoint info yet   *
       * (can't set it up in mos7720_startup as the  *
       * structures were not set up at that time.)   */
      if (!mos7720_serial->interrupt_started) {
            dbg("Interrupt buffer NULL !!!");

            /* not set up yet, so do it now */
            mos7720_serial->interrupt_started = 1;

            dbg("To Submit URB !!!");

            /* set up our interrupt urb */
            usb_fill_int_urb(port0->interrupt_in_urb, serial->dev,
                         usb_rcvintpipe(serial->dev,
                                    port->interrupt_in_endpointAddress),
                         port0->interrupt_in_buffer,
                         port0->interrupt_in_urb->transfer_buffer_length,
                         mos7720_interrupt_callback, mos7720_port,
                         port0->interrupt_in_urb->interval);

            /* start interrupt read for this mos7720 this interrupt *
               * will continue as long as the mos7720 is connected    */
            dbg("Submit URB over !!!");
            response = usb_submit_urb(port0->interrupt_in_urb, GFP_KERNEL);
            if (response)
                  dev_err(&port->dev,
                        "%s - Error %d submitting control urb\n",
                        __FUNCTION__, response);
      }

      /* set up our bulk in urb */
      usb_fill_bulk_urb(port->read_urb, serial->dev,
                    usb_rcvbulkpipe(serial->dev,
                                port->bulk_in_endpointAddress),
                    port->bulk_in_buffer,
                    port->read_urb->transfer_buffer_length,
                    mos7720_bulk_in_callback, mos7720_port);
      response = usb_submit_urb(port->read_urb, GFP_KERNEL);
      if (response)
            dev_err(&port->dev,
                  "%s - Error %d submitting read urb\n", __FUNCTION__, response);

      /* initialize our icount structure */
      memset(&(mos7720_port->icount), 0x00, sizeof(mos7720_port->icount));

      /* initialize our port settings */
      mos7720_port->shadowMCR = UART_MCR_OUT2; /* Must set to enable ints! */

      /* send a open port command */
      mos7720_port->open = 1;

      return 0;
}

/*
 * mos7720_chars_in_buffer
 *    this function is called by the tty driver when it wants to know how many
 *    bytes of data we currently have outstanding in the port (data that has
 *    been written, but hasn't made it out the port yet)
 *    If successful, we return the number of bytes left to be written in the
 *    system,
 *    Otherwise we return a negative error number.
 */
static int mos7720_chars_in_buffer(struct usb_serial_port *port)
{
      int i;
      int chars = 0;
      struct moschip_port *mos7720_port;

      dbg("%s:entering ...........", __FUNCTION__);

      mos7720_port = usb_get_serial_port_data(port);
      if (mos7720_port == NULL) {
            dbg("%s:leaving ...........", __FUNCTION__);
            return -ENODEV;
      }

      for (i = 0; i < NUM_URBS; ++i) {
            if (mos7720_port->write_urb_pool[i] && mos7720_port->write_urb_pool[i]->status == -EINPROGRESS)
                  chars += URB_TRANSFER_BUFFER_SIZE;
      }
      dbg("%s - returns %d", __FUNCTION__, chars);
      return chars;
}

static void mos7720_close(struct usb_serial_port *port, struct file *filp)
{
      struct usb_serial *serial;
      struct moschip_port *mos7720_port;
      char data;
      int j;

      dbg("mos7720_close:entering...");

      serial = port->serial;

      mos7720_port = usb_get_serial_port_data(port);
      if (mos7720_port == NULL)
            return;

      for (j = 0; j < NUM_URBS; ++j)
            usb_kill_urb(mos7720_port->write_urb_pool[j]);

      /* Freeing Write URBs */
      for (j = 0; j < NUM_URBS; ++j) {
            if (mos7720_port->write_urb_pool[j]) {
                  kfree(mos7720_port->write_urb_pool[j]->transfer_buffer);
                  usb_free_urb(mos7720_port->write_urb_pool[j]);
            }
      }

      /* While closing port, shutdown all bulk read, write  *
       * and interrupt read if they exists                  */
      if (serial->dev) {
            dbg("Shutdown bulk write");
            usb_kill_urb(port->write_urb);
            dbg("Shutdown bulk read");
            usb_kill_urb(port->read_urb);
      }

      data = 0x00;
      send_mos_cmd(serial, MOS_WRITE, port->number - port->serial->minor,
                 0x04, &data);

      data = 0x00;
      send_mos_cmd(serial, MOS_WRITE, port->number - port->serial->minor,
                 0x01, &data);

      mos7720_port->open = 0;

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

static void mos7720_break(struct usb_serial_port *port, int break_state)
{
        unsigned char data;
      struct usb_serial *serial;
      struct moschip_port *mos7720_port;

      dbg("Entering %s", __FUNCTION__);

      serial = port->serial;

      mos7720_port = usb_get_serial_port_data(port);
      if (mos7720_port == NULL)
            return;

      if (break_state == -1)
            data = mos7720_port->shadowLCR | UART_LCR_SBC;
      else
            data = mos7720_port->shadowLCR & ~UART_LCR_SBC;

      mos7720_port->shadowLCR  = data;
      send_mos_cmd(serial, MOS_WRITE, port->number - port->serial->minor,
                 0x03, &data);

      return;
}

/*
 * mos7720_write_room
 *    this function is called by the tty driver when it wants to know how many
 *    bytes of data we can accept for a specific port.
 *    If successful, we return the amount of room that we have for this port
 *    Otherwise we return a negative error number.
 */
static int mos7720_write_room(struct usb_serial_port *port)
{
      struct moschip_port *mos7720_port;
      int room = 0;
      int i;

      dbg("%s:entering ...........", __FUNCTION__);

      mos7720_port = usb_get_serial_port_data(port);
      if (mos7720_port == NULL) {
            dbg("%s:leaving ...........", __FUNCTION__);
            return -ENODEV;
      }

      for (i = 0; i < NUM_URBS; ++i) {
            if (mos7720_port->write_urb_pool[i] && mos7720_port->write_urb_pool[i]->status != -EINPROGRESS)
                  room += URB_TRANSFER_BUFFER_SIZE;
      }

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

static int mos7720_write(struct usb_serial_port *port,
                   const unsigned char *data, int count)
{
      int status;
      int i;
      int bytes_sent = 0;
      int transfer_size;

      struct moschip_port *mos7720_port;
      struct usb_serial *serial;
      struct urb    *urb;
      const unsigned char *current_position = data;

      dbg("%s:entering ...........", __FUNCTION__);

      serial = port->serial;

      mos7720_port = usb_get_serial_port_data(port);
      if (mos7720_port == NULL) {
            dbg("mos7720_port is NULL");
            return -ENODEV;
      }

      /* try to find a free urb in the list */
      urb = NULL;

      for (i = 0; i < NUM_URBS; ++i) {
            if (mos7720_port->write_urb_pool[i] && mos7720_port->write_urb_pool[i]->status != -EINPROGRESS) {
                  urb = mos7720_port->write_urb_pool[i];
                  dbg("URB:%d",i);
                  break;
            }
      }

      if (urb == NULL) {
            dbg("%s - no more free urbs", __FUNCTION__);
            goto exit;
      }

      if (urb->transfer_buffer == NULL) {
            urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE,
                                     GFP_KERNEL);
            if (urb->transfer_buffer == NULL) {
                  err("%s no more kernel memory...", __FUNCTION__);
                  goto exit;
            }
      }
      transfer_size = min (count, URB_TRANSFER_BUFFER_SIZE);

      memcpy(urb->transfer_buffer, current_position, transfer_size);
      usb_serial_debug_data(debug, &port->dev, __FUNCTION__, transfer_size,
                        urb->transfer_buffer);

      /* fill urb with data and submit  */
      usb_fill_bulk_urb(urb, serial->dev,
                    usb_sndbulkpipe(serial->dev,
                                port->bulk_out_endpointAddress),
                    urb->transfer_buffer, transfer_size,
                    mos7720_bulk_out_data_callback, mos7720_port);

      /* send it down the pipe */
      status = usb_submit_urb(urb,GFP_ATOMIC);
      if (status) {
            err("%s - usb_submit_urb(write bulk) failed with status = %d",
                __FUNCTION__, status);
            bytes_sent = status;
            goto exit;
      }
      bytes_sent = transfer_size;

exit:
      return bytes_sent;
}

static void mos7720_throttle(struct usb_serial_port *port)
{
      struct moschip_port *mos7720_port;
      struct tty_struct *tty;
      int status;

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

      mos7720_port = usb_get_serial_port_data(port);

      if (mos7720_port == NULL)
            return;

      if (!mos7720_port->open) {
            dbg("port not opened");
            return;
      }

      dbg("%s: Entering ..........", __FUNCTION__);

      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 = mos7720_write(port, &stop_char, 1);
            if (status <= 0)
                  return;
      }

      /* if we are implementing RTS/CTS, toggle that line */
      if (tty->termios->c_cflag & CRTSCTS) {
            mos7720_port->shadowMCR &= ~UART_MCR_RTS;
            status = send_mos_cmd(port->serial, MOS_WRITE,
                              port->number - port->serial->minor,
                              UART_MCR, &mos7720_port->shadowMCR);
            if (status != 0)
                  return;
      }
}

static void mos7720_unthrottle(struct usb_serial_port *port)
{
      struct tty_struct *tty;
      int status;
      struct moschip_port *mos7720_port = usb_get_serial_port_data(port);

      if (mos7720_port == NULL)
            return;

      if (!mos7720_port->open) {
            dbg("%s - port not opened", __FUNCTION__);
            return;
      }

      dbg("%s: Entering ..........", __FUNCTION__);

      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 = mos7720_write(port, &start_char, 1);
            if (status <= 0)
                  return;
      }

      /* if we are implementing RTS/CTS, toggle that line */
      if (tty->termios->c_cflag & CRTSCTS) {
            mos7720_port->shadowMCR |= UART_MCR_RTS;
            status = send_mos_cmd(port->serial, MOS_WRITE,
                              port->number - port->serial->minor,
                              UART_MCR, &mos7720_port->shadowMCR);
            if (status != 0)
                  return;
      }
}

static int set_higher_rates(struct moschip_port *mos7720_port,
                      unsigned int baud)
{
      unsigned char data;
      struct usb_serial_port *port;
      struct usb_serial *serial;
      int port_number;

      if (mos7720_port == NULL)
            return -EINVAL;

      port = mos7720_port->port;
      serial = port->serial;

        /***********************************************
         *      Init Sequence for higher rates
         ***********************************************/
      dbg("Sending Setting Commands ..........");
      port_number = port->number - port->serial->minor;

      data = 0x000;
      send_mos_cmd(serial, MOS_WRITE, port_number, 0x01, &data);
      data = 0x000;
      send_mos_cmd(serial, MOS_WRITE, port_number, 0x02, &data);
      data = 0x0CF;
      send_mos_cmd(serial, MOS_WRITE, port->number, 0x02, &data);
      data = 0x00b;
        mos7720_port->shadowMCR  = data;
      send_mos_cmd(serial, MOS_WRITE, port_number, 0x04, &data);
      data = 0x00b;
      send_mos_cmd(serial, MOS_WRITE, port_number, 0x04, &data);

      data = 0x000;
      send_mos_cmd(serial, MOS_READ, MOS_MAX_PORT, 0x08, &data);
      data = 0x000;
      send_mos_cmd(serial, MOS_WRITE, MOS_MAX_PORT, 0x08, &data);


        /***********************************************
         *              Set for higher rates           *
         ***********************************************/

      data = baud * 0x10;
      send_mos_cmd(serial, MOS_WRITE, MOS_MAX_PORT, port_number + 1,&data);

      data = 0x003;
      send_mos_cmd(serial, MOS_READ, MOS_MAX_PORT, 0x08, &data);
      data = 0x003;
      send_mos_cmd(serial, MOS_WRITE, MOS_MAX_PORT, 0x08, &data);

      data = 0x02b;
        mos7720_port->shadowMCR  = data;
      send_mos_cmd(serial, MOS_WRITE, port_number, 0x04, &data);
      data = 0x02b;
      send_mos_cmd(serial, MOS_WRITE, port_number, 0x04, &data);

        /***********************************************
         *              Set DLL/DLM
         ***********************************************/

      data = mos7720_port->shadowLCR | UART_LCR_DLAB;
        mos7720_port->shadowLCR  = data;
      send_mos_cmd(serial, MOS_WRITE, port_number, 0x03, &data);

      data =  0x001; /* DLL */
        send_mos_cmd(serial, MOS_WRITE, port_number, 0x00, &data);
      data =  0x000; /* DLM */
        send_mos_cmd(serial, MOS_WRITE, port_number, 0x01, &data);

      data = mos7720_port->shadowLCR & ~UART_LCR_DLAB;
        mos7720_port->shadowLCR  = data;
      send_mos_cmd(serial, MOS_WRITE, port_number, 0x03, &data);

      return 0;
}

/* baud rate information */
struct divisor_table_entry
{
      __u32  baudrate;
      __u16  divisor;
};

/* Define table of divisors for moschip 7720 hardware    *
 * These assume a 3.6864MHz crystal, the standard /16, and *
 * MCR.7 = 0.                                      */
static struct divisor_table_entry divisor_table[] = {
      {   50,           2304},
      {   110,    1047},      /* 2094.545455 => 230450   => .0217 % over */
      {   134,    857}, /* 1713.011152 => 230398.5 => .00065% under */
      {   150,    768},
      {   300,    384},
      {   600,    192},
      {   1200,   96},
      {   1800,   64},
      {   2400,   48},
      {   4800,   24},
      {   7200,   16},
      {   9600,   12},
      {   19200,  6},
      {   38400,  3},
      {   57600,  2},
      {   115200, 1},
};

/*****************************************************************************
 * calc_baud_rate_divisor
 *    this function calculates the proper baud rate divisor for the specified
 *    baud rate.
 *****************************************************************************/
static int calc_baud_rate_divisor(int baudrate, int *divisor)
{
      int i;
      __u16 custom;
      __u16 round1;
      __u16 round;


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

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

        /* After trying for all the standard baud rates    *
         * Try calculating the divisor for this baud rate  */
      if (baudrate > 75 &&  baudrate < 230400) {
            /* get the divisor */
            custom = (__u16)(230400L  / baudrate);

            /* Check for round off */
            round1 = (__u16)(2304000L / baudrate);
            round = (__u16)(round1 - (custom * 10));
            if (round > 4)
                  custom++;
            *divisor = custom;

            dbg("Baud %d = %d",baudrate, custom);
            return 0;
      }

      dbg("Baud calculation Failed...");
      return -EINVAL;
}

/*
 * send_cmd_write_baud_rate
 *    this function sends the proper command to change the baud rate of the
 *    specified port.
 */
static int send_cmd_write_baud_rate(struct moschip_port *mos7720_port,
                            int baudrate)
{
      struct usb_serial_port *port;
      struct usb_serial *serial;
      int divisor;
      int status;
      unsigned char data;
      unsigned char number;

      if (mos7720_port == NULL)
            return -1;

      port = mos7720_port->port;
      serial = port->serial;

      dbg("%s: Entering ..........", __FUNCTION__);

      number = port->number - port->serial->minor;
      dbg("%s - port = %d, baud = %d", __FUNCTION__, port->number, baudrate);

        /* Calculate the Divisor */
      status = calc_baud_rate_divisor(baudrate, &divisor);
      if (status) {
            err("%s - bad baud rate", __FUNCTION__);
            return status;
      }

        /* Enable access to divisor latch */
        data = mos7720_port->shadowLCR | UART_LCR_DLAB;
        mos7720_port->shadowLCR  = data;
        send_mos_cmd(serial, MOS_WRITE, number, UART_LCR, &data);

      /* Write the divisor */
      data = ((unsigned char)(divisor & 0xff));
        send_mos_cmd(serial, MOS_WRITE, number, 0x00, &data);

      data = ((unsigned char)((divisor & 0xff00) >> 8));
        send_mos_cmd(serial, MOS_WRITE, number, 0x01, &data);

        /* Disable access to divisor latch */
        data = mos7720_port->shadowLCR & ~UART_LCR_DLAB;
        mos7720_port->shadowLCR = data;
        send_mos_cmd(serial, MOS_WRITE, number, 0x03, &data);

      return status;
}

/*
 * change_port_settings
 *    This routine is called to set the UART on the device to match
 *      the specified new settings.
 */
static void change_port_settings(struct moschip_port *mos7720_port,
                         struct ktermios *old_termios)
{
      struct usb_serial_port *port;
      struct usb_serial *serial;
      struct tty_struct *tty;
      int baud;
      unsigned cflag;
      unsigned iflag;
      __u8 mask = 0xff;
      __u8 lData;
      __u8 lParity;
      __u8 lStop;
      int status;
      int port_number;
      char data;

      if (mos7720_port == NULL)
            return ;

      port = mos7720_port->port;
      serial = port->serial;
      port_number = port->number - port->serial->minor;

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

      if (!mos7720_port->open) {
            dbg("%s - port not opened", __FUNCTION__);
            return;
      }

      tty = mos7720_port->port->tty;

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

      dbg("%s: Entering ..........", __FUNCTION__);

      lData = UART_LCR_WLEN8;
      lStop = 0x00;     /* 1 stop bit */
      lParity = 0x00;   /* No parity */

      cflag = tty->termios->c_cflag;
      iflag = tty->termios->c_iflag;

      /* Change the number of bits */
      switch (cflag & CSIZE) {
      case CS5:
            lData = UART_LCR_WLEN5;
            mask = 0x1f;
            break;

      case CS6:
            lData = UART_LCR_WLEN6;
            mask = 0x3f;
            break;

      case CS7:
            lData = UART_LCR_WLEN7;
            mask = 0x7f;
            break;
      default:
      case CS8:
            lData = UART_LCR_WLEN8;
            break;
      }

      /* Change the Parity bit */
      if (cflag & PARENB) {
            if (cflag & PARODD) {
                  lParity = UART_LCR_PARITY;
                  dbg("%s - parity = odd", __FUNCTION__);
            } else {
                  lParity = (UART_LCR_EPAR | UART_LCR_PARITY);
                  dbg("%s - parity = even", __FUNCTION__);
            }

      } else {
            dbg("%s - parity = none", __FUNCTION__);
      }

      if (cflag & CMSPAR)
            lParity = lParity | 0x20;

      /* Change the Stop bit */
      if (cflag & CSTOPB) {
            lStop = UART_LCR_STOP;
            dbg("%s - stop bits = 2", __FUNCTION__);
      } else {
            lStop = 0x00;
            dbg("%s - stop bits = 1", __FUNCTION__);
      }

#define LCR_BITS_MASK         0x03  /* Mask for bits/char field */
#define LCR_STOP_MASK         0x04  /* Mask for stop bits field */
#define LCR_PAR_MASK          0x38  /* Mask for parity field */

      /* Update the LCR with the correct value */
      mos7720_port->shadowLCR &= ~(LCR_BITS_MASK | LCR_STOP_MASK | LCR_PAR_MASK);
      mos7720_port->shadowLCR |= (lData | lParity | lStop);


      /* Disable Interrupts */
      data = 0x00;
        send_mos_cmd(serial,MOS_WRITE,port->number - port->serial->minor, UART_IER, &data);

      data = 0x00;
        send_mos_cmd(serial, MOS_WRITE, port_number, UART_FCR, &data);

      data = 0xcf;
        send_mos_cmd(serial, MOS_WRITE, port_number, UART_FCR, &data);

      /* Send the updated LCR value to the mos7720 */
      data = mos7720_port->shadowLCR;
        send_mos_cmd(serial, MOS_WRITE, port_number, UART_LCR, &data);

        data = 0x00b;
        mos7720_port->shadowMCR = data;
        send_mos_cmd(serial, MOS_WRITE, port_number, 0x04, &data);
        data = 0x00b;
        send_mos_cmd(serial, MOS_WRITE, port_number, 0x04, &data);

      /* set up the MCR register and send it to the mos7720 */
      mos7720_port->shadowMCR = UART_MCR_OUT2;
      if (cflag & CBAUD)
            mos7720_port->shadowMCR |= (UART_MCR_DTR | UART_MCR_RTS);

      if (cflag & CRTSCTS) {
            mos7720_port->shadowMCR |= (UART_MCR_XONANY);

                /* To set hardware flow control to the specified *
                 * serial port, in SP1/2_CONTROL_REG             */
            if (port->number) {
                  data = 0x001;
                  send_mos_cmd(serial, MOS_WRITE, MOS_MAX_PORT,
                             0x08, &data);
            } else {
                  data = 0x002;
                  send_mos_cmd(serial, MOS_WRITE, MOS_MAX_PORT,
                             0x08, &data);
            }
      } else {
            mos7720_port->shadowMCR &= ~(UART_MCR_XONANY);
      }

      data = mos7720_port->shadowMCR;
      send_mos_cmd(serial, MOS_WRITE, port_number, UART_MCR, &data);

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

      if (baud >= 230400) {
            set_higher_rates(mos7720_port, baud);
            /* Enable Interrupts */
            data = 0x0c;
            send_mos_cmd(serial, MOS_WRITE, port_number, UART_IER, &data);
            return;
      }

      dbg("%s - baud rate = %d", __FUNCTION__, baud);
      status = send_cmd_write_baud_rate(mos7720_port, baud);

      /* Enable Interrupts */
      data = 0x0c;
      send_mos_cmd(serial, MOS_WRITE, port_number, UART_IER, &data);

      if (port->read_urb->status != -EINPROGRESS) {
            port->read_urb->dev = serial->dev;

            status = usb_submit_urb(port->read_urb, GFP_ATOMIC);
            if (status)
                  dbg("usb_submit_urb(read bulk) failed, status = %d",
                      status);
      }
      return;
}

/*
 * mos7720_set_termios
 *    this function is called by the tty driver when it wants to change the
 *    termios structure.
 */
static void mos7720_set_termios(struct usb_serial_port *port,
                        struct ktermios *old_termios)
{
      int status;
      unsigned int cflag;
      struct usb_serial *serial;
      struct moschip_port *mos7720_port;
      struct tty_struct *tty;

      serial = port->serial;

      mos7720_port = usb_get_serial_port_data(port);

      if (mos7720_port == NULL)
            return;

      tty = port->tty;

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

      if (!mos7720_port->open) {
            dbg("%s - port not opened", __FUNCTION__);
            return;
      }

      dbg("%s\n","setting termios - ASPIRE");

      cflag = tty->termios->c_cflag;

      if (!cflag) {
            printk("%s %s\n",__FUNCTION__,"cflag is NULL");
            return;
      }

      dbg("%s - clfag %08x iflag %08x", __FUNCTION__,
          tty->termios->c_cflag,
          RELEVANT_IFLAG(tty->termios->c_iflag));

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

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

      /* change the port settings to the new ones specified */
      change_port_settings(mos7720_port, old_termios);

      if(!port->read_urb) {
            dbg("%s","URB KILLED !!!!!\n");
            return;
      }

      if(port->read_urb->status != -EINPROGRESS) {
            port->read_urb->dev = serial->dev;
            status = usb_submit_urb(port->read_urb, GFP_ATOMIC);
            if (status)
                  dbg("usb_submit_urb(read bulk) failed, status = %d",
                      status);
      }
      return;
}

/*
 * get_lsr_info - get line status register info
 *
 * Purpose: Let user call ioctl() to get info when the UART physically
 *        is emptied.  On bus types like RS485, the transmitter must
 *        release the bus after transmitting. This must be done when
 *        the transmit shift register is empty, not be done when the
 *        transmit holding register is empty.  This functionality
 *        allows an RS485 driver to be written in user space.
 */
static int get_lsr_info(struct moschip_port *mos7720_port,
                  unsigned int __user *value)
{
      int count;
      unsigned int result = 0;

      count = mos7720_chars_in_buffer(mos7720_port->port);
      if (count == 0) {
            dbg("%s -- Empty", __FUNCTION__);
            result = TIOCSER_TEMT;
      }

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

/*
 * get_number_bytes_avail - get number of bytes available
 *
 * Purpose: Let user call ioctl to get the count of number of bytes available.
 */
static int get_number_bytes_avail(struct moschip_port *mos7720_port,
                          unsigned int __user *value)
{
      unsigned int result = 0;
      struct tty_struct *tty = mos7720_port->port->tty;

      if (!tty)
            return -ENOIOCTLCMD;

      result = tty->read_cnt;

      dbg("%s(%d) = %d", __FUNCTION__,  mos7720_port->port->number, result);
      if (copy_to_user(value, &result, sizeof(int)))
            return -EFAULT;

      return -ENOIOCTLCMD;
}

static int set_modem_info(struct moschip_port *mos7720_port, unsigned int cmd,
                    unsigned int __user *value)
{
      unsigned int mcr ;
      unsigned int arg;
      unsigned char data;

      struct usb_serial_port *port;

      if (mos7720_port == NULL)
            return -1;

      port = (struct usb_serial_port*)mos7720_port->port;
      mcr = mos7720_port->shadowMCR;

      if (copy_from_user(&arg, value, sizeof(int)))
            return -EFAULT;

      switch (cmd) {
      case TIOCMBIS:
            if (arg & TIOCM_RTS)
                  mcr |= UART_MCR_RTS;
            if (arg & TIOCM_DTR)
                  mcr |= UART_MCR_RTS;
            if (arg & TIOCM_LOOP)
                  mcr |= UART_MCR_LOOP;
            break;

      case TIOCMBIC:
            if (arg & TIOCM_RTS)
                  mcr &= ~UART_MCR_RTS;
            if (arg & TIOCM_DTR)
                  mcr &= ~UART_MCR_RTS;
            if (arg & TIOCM_LOOP)
                  mcr &= ~UART_MCR_LOOP;
            break;

      case TIOCMSET:
            /* turn off the RTS and DTR and LOOPBACK
             * and then only turn on what was asked to */
            mcr &=  ~(UART_MCR_RTS | UART_MCR_DTR | UART_MCR_LOOP);
            mcr |= ((arg & TIOCM_RTS) ? UART_MCR_RTS : 0);
            mcr |= ((arg & TIOCM_DTR) ? UART_MCR_DTR : 0);
            mcr |= ((arg & TIOCM_LOOP) ? UART_MCR_LOOP : 0);
            break;
      }

      mos7720_port->shadowMCR = mcr;

      data = mos7720_port->shadowMCR;
      send_mos_cmd(port->serial, MOS_WRITE,
                 port->number - port->serial->minor, UART_MCR, &data);

      return 0;
}

static int get_modem_info(struct moschip_port *mos7720_port,
                    unsigned int __user *value)
{
      unsigned int result = 0;
      unsigned int msr = mos7720_port->shadowMSR;
      unsigned int mcr = mos7720_port->shadowMCR;

      result = ((mcr & UART_MCR_DTR)      ? TIOCM_DTR: 0)     /* 0x002 */
              | ((mcr & UART_MCR_RTS)     ? TIOCM_RTS: 0)   /* 0x004 */
              | ((msr & UART_MSR_CTS)     ? TIOCM_CTS: 0)   /* 0x020 */
              | ((msr & UART_MSR_DCD)     ? TIOCM_CAR: 0)   /* 0x040 */
              | ((msr & UART_MSR_RI)      ? TIOCM_RI:  0)   /* 0x080 */
              | ((msr & UART_MSR_DSR)     ? TIOCM_DSR: 0);  /* 0x100 */


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

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

static int get_serial_info(struct moschip_port *mos7720_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          = mos7720_port->port->serial->minor;
      tmp.port          = mos7720_port->port->number;
      tmp.irq                 = 0;
      tmp.flags         = ASYNC_SKIP_TEST | ASYNC_AUTO_IRQ;
        tmp.xmit_fifo_size    = NUM_URBS * URB_TRANSFER_BUFFER_SIZE;
      tmp.baud_base           = 9600;
      tmp.close_delay         = 5*HZ;
      tmp.closing_wait  = 30*HZ;

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

static int mos7720_ioctl(struct usb_serial_port *port, struct file *file,
                   unsigned int cmd, unsigned long arg)
{
      struct moschip_port *mos7720_port;
      struct async_icount cnow;
      struct async_icount cprev;
      struct serial_icounter_struct icount;

      mos7720_port = usb_get_serial_port_data(port);
      if (mos7720_port == NULL)
            return -ENODEV;

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

      switch (cmd) {
      case TIOCINQ:
            /* return number of bytes available */
            dbg("%s (%d) TIOCINQ", __FUNCTION__,  port->number);
            return get_number_bytes_avail(mos7720_port,
                                    (unsigned int __user *)arg);
            break;

      case TIOCSERGETLSR:
            dbg("%s (%d) TIOCSERGETLSR", __FUNCTION__,  port->number);
            return get_lsr_info(mos7720_port, (unsigned int __user *)arg);
            return 0;

      case TIOCMBIS:
      case TIOCMBIC:
      case TIOCMSET:
            dbg("%s (%d) TIOCMSET/TIOCMBIC/TIOCMSET", __FUNCTION__,
                port->number);
            return set_modem_info(mos7720_port, cmd,
                              (unsigned int __user *)arg);

      case TIOCMGET:
            dbg("%s (%d) TIOCMGET", __FUNCTION__,  port->number);
            return get_modem_info(mos7720_port,
                              (unsigned int __user *)arg);

      case TIOCGSERIAL:
            dbg("%s (%d) TIOCGSERIAL", __FUNCTION__,  port->number);
            return get_serial_info(mos7720_port,
                               (struct serial_struct __user *)arg);

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

      case TIOCMIWAIT:
            dbg("%s (%d) TIOCMIWAIT", __FUNCTION__,  port->number);
            cprev = mos7720_port->icount;
            while (1) {
                  if (signal_pending(current))
                        return -ERESTARTSYS;
                  cnow = mos7720_port->icount;
                  if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
                      cnow.dcd == cprev.dcd && cnow.cts == cprev.cts)
                        return -EIO; /* no change => error */
                  if (((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
                      ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
                      ((arg & TIOCM_CD)  && (cnow.dcd != cprev.dcd)) ||
                      ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts)) ) {
                        return 0;
                  }
                  cprev = cnow;
            }
            /* NOTREACHED */
            break;

      case TIOCGICOUNT:
            cnow = mos7720_port->icount;
            icount.cts = cnow.cts;
            icount.dsr = cnow.dsr;
            icount.rng = cnow.rng;
            icount.dcd = cnow.dcd;
            icount.rx = cnow.rx;
            icount.tx = cnow.tx;
            icount.frame = cnow.frame;
            icount.overrun = cnow.overrun;
            icount.parity = cnow.parity;
            icount.brk = cnow.brk;
            icount.buf_overrun = cnow.buf_overrun;

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

      return -ENOIOCTLCMD;
}

static int mos7720_startup(struct usb_serial *serial)
{
      struct moschip_serial *mos7720_serial;
      struct moschip_port *mos7720_port;
      struct usb_device *dev;
      int i;
      char data;

      dbg("%s: Entering ..........", __FUNCTION__);

      if (!serial) {
            dbg("Invalid Handler");
            return -ENODEV;
      }

      dev = serial->dev;

      /* create our private serial structure */
      mos7720_serial = kzalloc(sizeof(struct moschip_serial), GFP_KERNEL);
      if (mos7720_serial == NULL) {
            err("%s - Out of memory", __FUNCTION__);
            return -ENOMEM;
      }

      usb_set_serial_data(serial, mos7720_serial);

      /* we set up the pointers to the endpoints in the mos7720_open *
       * function, as the structures aren't created yet.             */

      /* set up port private structures */
      for (i = 0; i < serial->num_ports; ++i) {
            mos7720_port = kzalloc(sizeof(struct moschip_port), GFP_KERNEL);
            if (mos7720_port == NULL) {
                  err("%s - Out of memory", __FUNCTION__);
                  usb_set_serial_data(serial, NULL);
                  kfree(mos7720_serial);
                  return -ENOMEM;
            }

            /* Initialize all port interrupt end point to port 0 int
             * endpoint.  Our device has only one interrupt endpoint
             * comman to all ports */
            serial->port[i]->interrupt_in_endpointAddress = serial->port[0]->interrupt_in_endpointAddress;

            mos7720_port->port = serial->port[i];
            usb_set_serial_port_data(serial->port[i], mos7720_port);

            dbg("port number is %d", serial->port[i]->number);
            dbg("serial number is %d", serial->minor);
      }


      /* setting configuration feature to one */
      usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
                  (__u8)0x03, 0x00,0x01,0x00, NULL, 0x00, 5*HZ);

      send_mos_cmd(serial,MOS_READ,0x00, UART_LSR, &data);  // LSR For Port 1
      dbg("LSR:%x",data);

      send_mos_cmd(serial,MOS_READ,0x01, UART_LSR, &data);  // LSR For Port 2
      dbg("LSR:%x",data);

      return 0;
}

static void mos7720_shutdown(struct usb_serial *serial)
{
      int i;

      /* free private structure allocated for serial port */
      for (i=0; i < serial->num_ports; ++i) {
            kfree(usb_get_serial_port_data(serial->port[i]));
            usb_set_serial_port_data(serial->port[i], NULL);
      }

      /* free private structure allocated for serial device */
      kfree(usb_get_serial_data(serial));
      usb_set_serial_data(serial, NULL);
}

static struct usb_driver usb_driver = {
      .name =           "moschip7720",
      .probe =    usb_serial_probe,
      .disconnect =     usb_serial_disconnect,
      .id_table = moschip_port_id_table,
      .no_dynamic_id =  1,
};

static struct usb_serial_driver moschip7720_2port_driver = {
      .driver = {
            .owner =    THIS_MODULE,
            .name =           "moschip7720",
      },
      .description            = "Moschip 2 port adapter",
      .usb_driver       = &usb_driver,
      .id_table         = moschip_port_id_table,
      .num_interrupt_in = 1,
      .num_bulk_in            = 2,
      .num_bulk_out           = 2,
      .num_ports        = 2,
      .open             = mos7720_open,
      .close                  = mos7720_close,
      .throttle         = mos7720_throttle,
      .unthrottle       = mos7720_unthrottle,
      .attach                 = mos7720_startup,
      .shutdown         = mos7720_shutdown,
      .ioctl                  = mos7720_ioctl,
      .set_termios            = mos7720_set_termios,
      .write                  = mos7720_write,
      .write_room       = mos7720_write_room,
      .chars_in_buffer  = mos7720_chars_in_buffer,
      .break_ctl        = mos7720_break,
      .read_bulk_callback     = mos7720_bulk_in_callback,
      .read_int_callback      = mos7720_interrupt_callback,
};

static int __init moschip7720_init(void)
{
      int retval;

      dbg("%s: Entering ..........", __FUNCTION__);

      /* Register with the usb serial */
      retval = usb_serial_register(&moschip7720_2port_driver);
      if (retval)
            goto failed_port_device_register;

      info(DRIVER_DESC " " DRIVER_VERSION);

      /* Register with the usb */
      retval = usb_register(&usb_driver);
      if (retval)
            goto failed_usb_register;

      return 0;

failed_usb_register:
      usb_serial_deregister(&moschip7720_2port_driver);

failed_port_device_register:
      return retval;
}

static void __exit moschip7720_exit(void)
{
      usb_deregister(&usb_driver);
      usb_serial_deregister(&moschip7720_2port_driver);
}

module_init(moschip7720_init);
module_exit(moschip7720_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");

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