USB: add USB serial mos7720 driver
authorGreg Kroah-Hartman <gregkh@suse.de>
Tue, 9 Apr 2002 19:14:34 +0000 (12:14 -0700)
committerGreg Kroah-Hartman <gregkh@suse.de>
Tue, 17 Oct 2006 21:46:32 +0000 (14:46 -0700)
Add support for Moschip 7720 USB dual port usb to serial device.

This driver is originally based on the drivers/usb/io_edgeport.c driver.

Cleaned up and forward ported by me.

Cc: VijayaKumar <vijaykumar@aspirecom.net>
Cc: AjayKumar <ajay@aspirecom.net>
Cc: Gurudeva <gurudev@aspirecom.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
drivers/usb/serial/Kconfig
drivers/usb/serial/Makefile
drivers/usb/serial/mos7720.c [new file with mode: 0644]

index 5076b9d..8ca6d3f 100644 (file)
@@ -422,6 +422,16 @@ config USB_SERIAL_MCT_U232
          To compile this driver as a module, choose M here: the
          module will be called mct_u232.
 
+config USB_SERIAL_MOS7720
+       tristate "USB Moschip 7720 Single Port Serial Driver"
+       depends on USB_SERIAL
+       ---help---
+         Say Y here if you want to use a USB Serial single port adapter from
+         Moschip Semiconductor Tech.
+
+         To compile this driver as a module, choose M here: the
+         module will be called mos7720.
+
 config USB_SERIAL_MOS7840
        tristate "USB Moschip 7840/7820 USB Serial Driver"
        depends on USB_SERIAL
index 8dce833..a5047dc 100644 (file)
@@ -34,6 +34,7 @@ obj-$(CONFIG_USB_SERIAL_KEYSPAN_PDA)          += keyspan_pda.o
 obj-$(CONFIG_USB_SERIAL_KLSI)                  += kl5kusb105.o
 obj-$(CONFIG_USB_SERIAL_KOBIL_SCT)             += kobil_sct.o
 obj-$(CONFIG_USB_SERIAL_MCT_U232)              += mct_u232.o
+obj-$(CONFIG_USB_SERIAL_MOS7720)               += mos7720.o
 obj-$(CONFIG_USB_SERIAL_MOS7840)               += mos7840.o
 obj-$(CONFIG_USB_SERIAL_NAVMAN)                        += navman.o
 obj-$(CONFIG_USB_SERIAL_OMNINET)               += omninet.o
diff --git a/drivers/usb/serial/mos7720.c b/drivers/usb/serial/mos7720.c
new file mode 100644 (file)
index 0000000..82cd15b
--- /dev/null
@@ -0,0 +1,1683 @@
+/*
+ * 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:
+ *     VijayaKumar.G.N. <vijaykumar@aspirecom.net>
+ *     AjayKumar <ajay@aspirecom.net>
+ *     Gurudeva.N. <gurudev@aspirecom.net>
+ *
+ * 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;
+       __u32 *data;
+       unsigned int status;
+       __u8 sp1;
+       __u8 sp2;
+       __u8 st;
+
+       dbg("%s"," : Entering\n");
+
+       if (!urb) {
+               dbg("%s","Invalid Pointer !!!!:\n");
+               return;
+       }
+
+       switch (urb->status) {
+       case 0:
+               /* success */
+               break;
+       case -ECONNRESET:
+       case -ENOENT:
+       case -ESHUTDOWN:
+               /* this urb is terminated, clean up */
+               dbg("%s - urb shutting down with status: %d", __FUNCTION__,
+                   urb->status);
+               return;
+       default:
+               dbg("%s - nonzero urb status received: %d", __FUNCTION__,
+                   urb->status);
+               goto exit;
+       }
+
+       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 */
+       if (length && length > 4) {
+               dbg("Wrong data !!!");
+               return;
+       }
+
+       status = *data;
+
+       sp1 = (status & 0xff000000)>>24;
+       sp2 = (status & 0x00ff0000)>>16;
+       st = status & 0x000000ff;
+
+       if ((sp1 & 0x01) || (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 status;
+       unsigned char *data ;
+       struct usb_serial_port *port;
+       struct moschip_port *mos7720_port;
+       struct tty_struct *tty;
+
+       if (urb->status) {
+               dbg("nonzero read bulk status received: %d",urb->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;
+
+               status = usb_submit_urb(port->read_urb, GFP_ATOMIC);
+               if (status)
+                       dbg("usb_submit_urb(read bulk) failed, status = %d",
+                           status);
+       }
+}
+
+/*
+ * 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;
+
+       if (urb->status) {
+               dbg("nonzero write bulk status received:%d", urb->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) {
+               /* let the tty driver wakeup if it has a special *
+                * write_wakeup function */
+               if ((tty->flags & (1 << TTY_DO_WRITE_WAKEUP)) &&
+                    tty->ldisc.write_wakeup)
+                       (tty->ldisc.write_wakeup)(tty);
+
+               /* tell the tty driver that something has changed */
+               wake_up_interruptible(&tty->write_wait);
+       }
+
+       /* schedule_work(&mos7720_port->port->work); */
+}
+
+/*
+ * 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 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,SLAB_ATOMIC);
+               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__);
+                       continue;
+               }
+       }
+
+        /* 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",
+                               __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", __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]->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]->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]->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 termios *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 termios *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;
+       }
+
+       /* check that they really want us to change something */
+       if (old_termios) {
+               if ((cflag == old_termios->c_cflag) &&
+                   (RELEVANT_IFLAG(tty->termios->c_iflag) ==
+                    RELEVANT_IFLAG(old_termios->c_iflag))) {
+                       dbg("Nothing to change");
+                       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_serial_driver moschip7720_2port_driver = {
+       .driver = {
+               .owner =        THIS_MODULE,
+               .name =         "moschip7720",
+       },
+       .description            = "Moschip 2 port adapter",
+       .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,
+};
+
+static struct usb_driver usb_driver = {
+       .name =         "moschip7720",
+       .probe =        usb_serial_probe,
+       .disconnect =   usb_serial_disconnect,
+       .id_table =     moschip_port_id_table,
+};
+
+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");