USB: add USB serial mos7720 driver

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>

1 files changed, 1683 insertions, 0 deletions

diff --git a/drivers/usb/serial/mos7720.c b/drivers/usb/serial/mos7720.c
new file mode 100644
index 00000000000..82cd15b894b
--- /dev/null
+++ b/drivers/usb/serial/mos7720.c
@@ -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... */