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/*
 *  KOBIL USB Smart Card Terminal Driver
 *
 *  Copyright (C) 2002  KOBIL Systems GmbH 
 *  Author: Thomas Wahrenbruch
 *
 *  Contact: linuxusb@kobil.de
 *
 *  This program is largely derived from work by the linux-usb group
 *  and associated source files.  Please see the usb/serial files for
 *  individual credits and copyrights.
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  Thanks to Greg Kroah-Hartman (greg@kroah.com) for his help and
 *  patience.
 *
 * Supported readers: USB TWIN, KAAN Standard Plus and SecOVID Reader Plus
 * (Adapter K), B1 Professional and KAAN Professional (Adapter B)
 * 
 * (23/05/2003) tw
 *      Add support for KAAN SIM
 *
 * (12/03/2002) tw
 *      Fixed bug with Pro-readers and PNP
 *
 * (11/13/2002) tw
 *      Initial version.
 */
 
 
#include <linux/config.h>
#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 <asm/uaccess.h>
#include <linux/usb.h>
 
#include <linux/ioctl.h>
 
 
#include "kobil_sct.h"
 
#ifdef CONFIG_USB_SERIAL_DEBUG
	static int debug = 1;
#else
	static int debug;
#endif
 
#include "usb-serial.h"
 
/* Version Information */
#define DRIVER_VERSION "12/03/2002"
#define DRIVER_AUTHOR "KOBIL Systems GmbH - http://www.kobil.com"
#define DRIVER_DESC "KOBIL USB Smart Card Terminal Driver (experimental)"
 
#define KOBIL_VENDOR_ID	           0x0D46
#define KOBIL_ADAPTER_B_PRODUCT_ID 0x2011
#define KOBIL_ADAPTER_K_PRODUCT_ID 0x2012
#define KOBIL_USBTWIN_PRODUCT_ID   0x0078
#define KOBIL_KAAN_SIM_PRODUCT_ID  0x0081
 
#define KOBIL_TIMEOUT    500
#define KOBIL_BUF_LENGTH 300
 
 
/* Function prototypes */
static int  kobil_startup (struct usb_serial *serial);
static void kobil_shutdown (struct usb_serial *serial);
static int  kobil_open (struct usb_serial_port *port, struct file *filp);
static void kobil_close (struct usb_serial_port *port, struct file *filp);
static int  kobil_write (struct usb_serial_port *port, int from_user, 
			 const unsigned char *buf, int count);
static int  kobil_write_room(struct usb_serial_port *port);
static int  kobil_ioctl(struct usb_serial_port *port, struct file *file,
			unsigned int cmd, unsigned long arg);
static void kobil_read_int_callback( struct urb *urb );
static void kobil_write_callback( struct urb *purb );
 
 
static struct usb_device_id id_table [] = {
	{ USB_DEVICE(KOBIL_VENDOR_ID, KOBIL_ADAPTER_B_PRODUCT_ID) },
	{ USB_DEVICE(KOBIL_VENDOR_ID, KOBIL_ADAPTER_K_PRODUCT_ID) },
	{ USB_DEVICE(KOBIL_VENDOR_ID, KOBIL_USBTWIN_PRODUCT_ID) },
	{ USB_DEVICE(KOBIL_VENDOR_ID, KOBIL_KAAN_SIM_PRODUCT_ID) },
	{ }			/* Terminating entry */
};
 
 
MODULE_DEVICE_TABLE (usb, id_table);
 
struct usb_serial_device_type kobil_device = {
	.owner =                THIS_MODULE,
	.name =			"KOBIL USB smart card terminal",
	.id_table =		id_table,
	.num_interrupt_in =	NUM_DONT_CARE,
	.num_bulk_in =		0,
	.num_bulk_out =		0,
	.num_ports =		1,
	.startup =		kobil_startup,
	.shutdown =		kobil_shutdown,
	.ioctl =		kobil_ioctl,
	.open =			kobil_open,
	.close =		kobil_close,
	.write =		kobil_write,
	.write_room =           kobil_write_room,
	.read_int_callback =	kobil_read_int_callback,
};
 
 
struct kobil_private {
	int write_int_endpoint_address;
	int read_int_endpoint_address;
	unsigned char buf[KOBIL_BUF_LENGTH]; // buffer for the APDU to send
	int filled;  // index of the last char in buf
	int cur_pos; // index of the next char to send in buf
	__u16 device_type;
	int line_state;
	struct termios internal_termios;
};
 
 
static int kobil_startup (struct usb_serial *serial)
{
	int i;
	struct kobil_private *priv;
	struct usb_device *pdev;
	struct usb_config_descriptor *actconfig;
	struct usb_interface *interface;
	struct usb_interface_descriptor *altsetting;
	struct usb_endpoint_descriptor *endpoint;
 
	serial->port->private = kmalloc(sizeof(struct kobil_private), GFP_KERNEL);
	if (!serial->port->private){
		return -1;
	}
 
	priv = (struct kobil_private *) serial->port->private;
	priv->filled = 0;
	priv->cur_pos = 0;
	priv->device_type = serial->product;
	priv->line_state = 0;
 
	switch (priv->device_type){
	case KOBIL_ADAPTER_B_PRODUCT_ID:
		printk(KERN_DEBUG "KOBIL B1 PRO / KAAN PRO detected\n");
		break;
	case KOBIL_ADAPTER_K_PRODUCT_ID:
		printk(KERN_DEBUG "KOBIL KAAN Standard Plus / SecOVID Reader Plus detected\n");
		break;
	case KOBIL_USBTWIN_PRODUCT_ID:
		printk(KERN_DEBUG "KOBIL USBTWIN detected\n");
		break;
	case KOBIL_KAAN_SIM_PRODUCT_ID:
		printk(KERN_DEBUG "KOBIL KAAN SIM detected\n");
		break;
	}
 
	// search for the neccessary endpoints
	pdev = serial->dev;
 	actconfig = pdev->actconfig;
 	interface = actconfig->interface;
	altsetting = interface->altsetting;
 	endpoint = altsetting->endpoint;
 
 	for (i = 0; i < altsetting->bNumEndpoints; i++) {
		endpoint = &altsetting->endpoint[i];
		if (((endpoint->bEndpointAddress & USB_ENDPOINT_DIR_MASK) == USB_DIR_OUT) && 
 		    ((endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) == USB_ENDPOINT_XFER_INT)) {
		 	dbg("%s Found interrupt out endpoint. Address: %d", __FUNCTION__, endpoint->bEndpointAddress);
		 	priv->write_int_endpoint_address = endpoint->bEndpointAddress;
 		}
 		if (((endpoint->bEndpointAddress & USB_ENDPOINT_DIR_MASK) == USB_DIR_IN) && 
 		    ((endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) == USB_ENDPOINT_XFER_INT)) {
		 	dbg("%s Found interrupt in  endpoint. Address: %d", __FUNCTION__, endpoint->bEndpointAddress);
		 	priv->read_int_endpoint_address = endpoint->bEndpointAddress;
	 	}
	}
	return 0;
}
 
 
static void kobil_shutdown (struct usb_serial *serial)
{
	int i;
  	dbg("%s - port %d", __FUNCTION__, serial->port->number);
 
	for (i=0; i < serial->num_ports; ++i) {
		while (serial->port[i].open_count > 0) {
			kobil_close (&serial->port[i], NULL);
		}
		if (serial->port[i].private) {
			kfree(serial->port[i].private);
		}
	} 
}
 
 
static int kobil_open (struct usb_serial_port *port, struct file *filp)
{
	int i, result = 0;
	struct kobil_private *priv;
	unsigned char *transfer_buffer;
	int transfer_buffer_length = 8;
	int write_urb_transfer_buffer_length = 8;
 
  	dbg("%s - port %d", __FUNCTION__, port->number);
	priv = (struct kobil_private *) port->private;
	priv->line_state = 0;
 
	if (port_paranoia_check (port, __FUNCTION__))
		return -ENODEV;
 
	// someone sets the dev to 0 if the close method has been called
	port->interrupt_in_urb->dev = port->serial->dev;
 
 
	/* 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.
	 */
	port->tty->low_latency = 1;
 
	// without this, every push_tty_char is echoed :-(  
	port->tty->termios->c_lflag = 0;
	port->tty->termios->c_lflag &= ~(ISIG | ICANON | ECHO | IEXTEN | XCASE);
	port->tty->termios->c_iflag = IGNBRK | IGNPAR | IXOFF;
	port->tty->termios->c_oflag &= ~ONLCR; // do NOT translate CR to CR-NL (0x0A -> 0x0A 0x0D)
 
	// set up internal termios structure 
	priv->internal_termios.c_iflag = port->tty->termios->c_iflag;
	priv->internal_termios.c_oflag = port->tty->termios->c_oflag;
	priv->internal_termios.c_cflag = port->tty->termios->c_cflag;
	priv->internal_termios.c_lflag = port->tty->termios->c_lflag;
 
	for (i=0; i<NCCS; i++) {
		priv->internal_termios.c_cc[i] = port->tty->termios->c_cc[i];
	}
 
	// allocate memory for transfer buffer
	transfer_buffer = (unsigned char *) kmalloc(transfer_buffer_length, GFP_KERNEL);  
	if (! transfer_buffer) {
		return -1;
	} else {
		memset(transfer_buffer, 0, transfer_buffer_length);
	}
 
	// allocate write_urb
	if (!port->write_urb) { 
		dbg("%s - port %d  Allocating port->write_urb", __FUNCTION__, port->number);
		port->write_urb = usb_alloc_urb(0);  
		if (!port->write_urb) {
			dbg("%s - port %d usb_alloc_urb failed", __FUNCTION__, port->number);
			kfree(transfer_buffer);
			return -1;
		}
	}
 
	// allocate memory for write_urb transfer buffer
	port->write_urb->transfer_buffer = (unsigned char *) kmalloc(write_urb_transfer_buffer_length, GFP_KERNEL);
	if (! port->write_urb->transfer_buffer) {
		kfree(transfer_buffer);
		return -1;
	} 
 
	// get hardware version
	result = usb_control_msg( port->serial->dev, 
				  usb_rcvctrlpipe(port->serial->dev, 0 ), 
				  SUSBCRequest_GetMisc,
				  USB_TYPE_VENDOR | USB_RECIP_ENDPOINT | USB_DIR_IN,
				  SUSBCR_MSC_GetHWVersion,
				  0,
				  transfer_buffer,
				  transfer_buffer_length,
				  KOBIL_TIMEOUT
		);
	dbg("%s - port %d Send get_HW_version URB returns: %i", __FUNCTION__, port->number, result);
	dbg("Harware version: %i.%i.%i", transfer_buffer[0], transfer_buffer[1], transfer_buffer[2] );
 
	// get firmware version
	result = usb_control_msg( port->serial->dev, 
				  usb_rcvctrlpipe(port->serial->dev, 0 ), 
				  SUSBCRequest_GetMisc,
				  USB_TYPE_VENDOR | USB_RECIP_ENDPOINT | USB_DIR_IN,
				  SUSBCR_MSC_GetFWVersion,
				  0,
				  transfer_buffer,
				  transfer_buffer_length,
				  KOBIL_TIMEOUT
		);
	dbg("%s - port %d Send get_FW_version URB returns: %i", __FUNCTION__, port->number, result);
	dbg("Firmware version: %i.%i.%i", transfer_buffer[0], transfer_buffer[1], transfer_buffer[2] );
 
	if (priv->device_type == KOBIL_ADAPTER_B_PRODUCT_ID || priv->device_type == KOBIL_ADAPTER_K_PRODUCT_ID) {
		// Setting Baudrate, Parity and Stopbits
		result = usb_control_msg( port->serial->dev, 
					  usb_rcvctrlpipe(port->serial->dev, 0 ), 
					  SUSBCRequest_SetBaudRateParityAndStopBits,
					  USB_TYPE_VENDOR | USB_RECIP_ENDPOINT | USB_DIR_OUT,
					  SUSBCR_SBR_9600 | SUSBCR_SPASB_EvenParity | SUSBCR_SPASB_1StopBit,
					  0,
					  transfer_buffer,
					  0,
					  KOBIL_TIMEOUT
			);
		dbg("%s - port %d Send set_baudrate URB returns: %i", __FUNCTION__, port->number, result);
 
		// reset all queues
		result = usb_control_msg( port->serial->dev, 
					  usb_rcvctrlpipe(port->serial->dev, 0 ), 
					  SUSBCRequest_Misc,
					  USB_TYPE_VENDOR | USB_RECIP_ENDPOINT | USB_DIR_OUT,
					  SUSBCR_MSC_ResetAllQueues,
					  0,
					  transfer_buffer,
					  0,
					  KOBIL_TIMEOUT
			);
		dbg("%s - port %d Send reset_all_queues URB returns: %i", __FUNCTION__, port->number, result);
	}
 
	if (priv->device_type == KOBIL_USBTWIN_PRODUCT_ID || priv->device_type == KOBIL_ADAPTER_B_PRODUCT_ID ||
	    priv->device_type == KOBIL_KAAN_SIM_PRODUCT_ID) {
		// start reading (Adapter B 'cause PNP string)
		result = usb_submit_urb( port->interrupt_in_urb ); 
		dbg("%s - port %d Send read URB returns: %i", __FUNCTION__, port->number, result);
	}
 
	kfree(transfer_buffer);
	return 0;
}
 
 
static void kobil_close (struct usb_serial_port *port, struct file *filp)
{
	dbg("%s - port %d", __FUNCTION__, port->number);
 
	if (port->write_urb){
		usb_unlink_urb( port->write_urb );
		usb_free_urb( port->write_urb );
		port->write_urb = 0;
	}
	if (port->interrupt_in_urb){
		usb_unlink_urb (port->interrupt_in_urb);
	}
}
 
 
static void kobil_read_int_callback( struct urb *purb )
{  
	int i;
	struct usb_serial_port *port = (struct usb_serial_port *) purb->context;
	struct tty_struct *tty;
	unsigned char *data = purb->transfer_buffer;
	char *dbg_data;
 
	dbg("%s - port %d", __FUNCTION__, port->number);
 
	if (purb->status) {
		dbg("%s - port %d Read int status not zero: %d", __FUNCTION__, port->number, purb->status);
		return;
	}
 
	tty = port->tty; 
	if (purb->actual_length) {
 
		// BEGIN DEBUG
		dbg_data = (unsigned char *) kmalloc((3 *  purb->actual_length + 10) * sizeof(char), GFP_KERNEL);  
		if (! dbg_data) {
			return;
		}
		memset(dbg_data, 0, (3 *  purb->actual_length + 10));
		for (i = 0; i < purb->actual_length; i++) { 
			sprintf(dbg_data +3*i, "%02X ", data[i]); 
		}
		dbg(" <-- %s", dbg_data );
		kfree(dbg_data);
		// END DEBUG
 
		for (i = 0; i < purb->actual_length; ++i) {
			// if we insert more than TTY_FLIPBUF_SIZE characters, we drop them.
			if(tty->flip.count >= TTY_FLIPBUF_SIZE) {
				tty_flip_buffer_push(tty);
			}
			// this doesn't actually push the data through unless tty->low_latency is set
			tty_insert_flip_char(tty, data[i], 0);
		}
		tty_flip_buffer_push(tty);
	}
}
 
 
static void kobil_write_callback( struct urb *purb )
{
}
 
 
static int kobil_write (struct usb_serial_port *port, int from_user, 
			const unsigned char *buf, int count)
{
	int length = 0;
	int result = 0;
	int todo = 0;
	struct kobil_private * priv;
	int i;
	char *data;
 
	if (count == 0) {
		dbg("%s - port %d write request of 0 bytes", __FUNCTION__, port->number);
		return 0;
	}
 
	priv = (struct kobil_private *) port->private;
 
	if (count > (KOBIL_BUF_LENGTH - priv->filled)) {
		dbg("%s - port %d Error: write request bigger than buffer size", __FUNCTION__, port->number);
		return -ENOMEM;
	}
 
	// BEGIN DEBUG
	data = (unsigned char *) kmalloc((3 * count + 10) * sizeof(char), GFP_KERNEL);  
	if (! data) {
		return (-1);
	}
	memset(data, 0, (3 * count + 10));
	for (i = 0; i < count; i++) { 
		sprintf(data +3*i, "%02X ", buf[i]); 
	} 
	dbg(" %d --> %s", port->number, data );
	kfree(data);
	// END DEBUG
 
	// Copy data to buffer
	if (from_user) {
		if (copy_from_user(priv->buf + priv->filled, buf, count)) {
			return -EFAULT;
		}
	} else {
		memcpy (priv->buf + priv->filled, buf, count);
	}
 
	priv->filled = priv->filled + count;
 
 
	// only send complete block. TWIN, KAAN SIM and adapter K use the same protocol.
	if ( ((priv->device_type != KOBIL_ADAPTER_B_PRODUCT_ID) && (priv->filled > 2) && (priv->filled >= (priv->buf[1] + 3))) || 
	     ((priv->device_type == KOBIL_ADAPTER_B_PRODUCT_ID) && (priv->filled > 3) && (priv->filled >= (priv->buf[2] + 4))) ) {
 
		// stop reading (except TWIN and KAAN SIM)
		if ( (priv->device_type == KOBIL_ADAPTER_B_PRODUCT_ID) || (priv->device_type == KOBIL_ADAPTER_K_PRODUCT_ID) ) {
			usb_unlink_urb( port->interrupt_in_urb );
		}
 
		todo = priv->filled - priv->cur_pos;
 
		while(todo > 0) {
			// max 8 byte in one urb (endpoint size)
			length = (todo < 8) ? todo : 8;
			// copy data to transfer buffer
			memcpy(port->write_urb->transfer_buffer, priv->buf + priv->cur_pos, length );
 
			usb_fill_bulk_urb( port->write_urb,
					   port->serial->dev,
					   usb_sndbulkpipe( port->serial->dev, priv->write_int_endpoint_address),
					   port->write_urb->transfer_buffer,
					   length,
					   kobil_write_callback,
					   port
				);
 
			priv->cur_pos = priv->cur_pos + length;
			result = usb_submit_urb( port->write_urb );
			dbg("%s - port %d Send write URB returns: %i", __FUNCTION__, port->number, result);
			todo = priv->filled - priv->cur_pos;
 
			if (todo > 0) {
				//mdelay(16);
				set_current_state(TASK_UNINTERRUPTIBLE);
				schedule_timeout(24 * HZ / 1000);
			}
 
		} // end while
 
		priv->filled = 0;
		priv->cur_pos = 0;
 
		// start reading (except TWIN and KAAN SIM)
		if ( (priv->device_type == KOBIL_ADAPTER_B_PRODUCT_ID) || (priv->device_type == KOBIL_ADAPTER_K_PRODUCT_ID) ) {
			// someone sets the dev to 0 if the close method has been called
			port->interrupt_in_urb->dev = port->serial->dev;
 
			// start reading
			result = usb_submit_urb( port->interrupt_in_urb ); 
			dbg("%s - port %d Send read URB returns: %i", __FUNCTION__, port->number, result);
		}
 
	}
	return count;  
}
 
 
static int kobil_write_room (struct usb_serial_port *port)
{
	return 8;
}
 
 
static int  kobil_ioctl(struct usb_serial_port *port, struct file *file,
			unsigned int cmd, unsigned long arg)
{
	struct kobil_private * priv;
	int mask;
	int result;
	unsigned short urb_val = 0;
	unsigned char *transfer_buffer;
	int transfer_buffer_length = 8;
	char *settings;
 
	priv = (struct kobil_private *) port->private;
	if ((priv->device_type == KOBIL_USBTWIN_PRODUCT_ID) || (priv->device_type == KOBIL_KAAN_SIM_PRODUCT_ID)) {
		// This device doesn't support ioctl calls
		return 0;
	}
 
	switch (cmd) {
	case TCGETS:   // 0x5401
		result = verify_area(VERIFY_WRITE, (void *)arg, sizeof(struct termios));
		if (result) {
			dbg("%s - port %d Error in verify_area", __FUNCTION__, port->number);
			return(result);
		}
		kernel_termios_to_user_termios((struct termios *)arg, &priv->internal_termios);
		return 0;
 
	case TCSETS:   // 0x5402
		if (! &port->tty->termios) {
			dbg("%s - port %d Error: port->tty->termios is NULL", __FUNCTION__, port->number);
			return -ENOTTY;
		}
		result = verify_area(VERIFY_READ, (void *)arg, sizeof(struct termios));
		if (result) {
			dbg("%s - port %d Error in verify_area", __FUNCTION__, port->number);
			return result;
		}
		user_termios_to_kernel_termios( &priv->internal_termios, (struct termios *)arg);
 
		settings = (unsigned char *) kmalloc(50, GFP_KERNEL);  
		if (! settings) {
			return -ENOBUFS;
		}
		memset(settings, 0, 50);
 
		switch (priv->internal_termios.c_cflag & CBAUD) {
		case B1200:
			urb_val = SUSBCR_SBR_1200;
			strcat(settings, "1200 ");
			break;
		case B9600:
		default:
			urb_val = SUSBCR_SBR_9600;
			strcat(settings, "9600 ");
			break;
		}
 
		urb_val |= (priv->internal_termios.c_cflag & CSTOPB) ? SUSBCR_SPASB_2StopBits : SUSBCR_SPASB_1StopBit;
		strcat(settings, (priv->internal_termios.c_cflag & CSTOPB) ? "2 StopBits " : "1 StopBit ");
 
		if (priv->internal_termios.c_cflag & PARENB) {
			if  (priv->internal_termios.c_cflag & PARODD) {
				urb_val |= SUSBCR_SPASB_OddParity;
				strcat(settings, "Odd Parity");
			} else {
				urb_val |= SUSBCR_SPASB_EvenParity;
				strcat(settings, "Even Parity");
			}
		} else {
			urb_val |= SUSBCR_SPASB_NoParity;
			strcat(settings, "No Parity");
		}
		dbg("%s - port %d setting port to: %s", __FUNCTION__, port->number, settings );
 
		result = usb_control_msg( port->serial->dev, 
					  usb_rcvctrlpipe(port->serial->dev, 0 ), 
					  SUSBCRequest_SetBaudRateParityAndStopBits,
					  USB_TYPE_VENDOR | USB_RECIP_ENDPOINT | USB_DIR_OUT,
					  urb_val,
					  0,
					  settings,
					  0,
					  KOBIL_TIMEOUT
			);
 
		dbg("%s - port %d Send set_baudrate URB returns: %i", __FUNCTION__, port->number, result);
		kfree(settings);
		return 0;
 
	case TCFLSH:   // 0x540B
		result = usb_control_msg( port->serial->dev, 
		 			  usb_rcvctrlpipe(port->serial->dev, 0 ), 
					  SUSBCRequest_Misc,
					  USB_TYPE_VENDOR | USB_RECIP_ENDPOINT | USB_DIR_OUT,
					  SUSBCR_MSC_ResetAllQueues,
					  0,
					  NULL,
					  0,
					  KOBIL_TIMEOUT
			);
 
		dbg("%s - port %d Send reset_all_queues (FLUSH) URB returns: %i", __FUNCTION__, port->number, result);
		return ((result < 0) ? -EFAULT : 0);
 
	case TIOCMGET: // 0x5415
		// allocate memory for transfer buffer
		transfer_buffer = (unsigned char *) kmalloc(transfer_buffer_length, GFP_KERNEL);  
		if (! transfer_buffer) {
			return -ENOBUFS;
		} else {
			memset(transfer_buffer, 0, transfer_buffer_length);
		}
 
		result = usb_control_msg( port->serial->dev, 
					  usb_rcvctrlpipe(port->serial->dev, 0 ), 
					  SUSBCRequest_GetStatusLineState,
					  USB_TYPE_VENDOR | USB_RECIP_ENDPOINT | USB_DIR_IN,
					  0,
					  0,
					  transfer_buffer,
					  transfer_buffer_length,
					  KOBIL_TIMEOUT
			);
 
		dbg("%s - port %d Send get_status_line_state (TIOCMGET) URB returns: %i. Statusline: %02x", 
		    __FUNCTION__, port->number, result, transfer_buffer[0]);
 
		if ((transfer_buffer[0] & SUSBCR_GSL_DSR) != 0) {
			priv->line_state |= TIOCM_DSR;
		} else {
			priv->line_state &= ~TIOCM_DSR; 
		}
 
		kfree(transfer_buffer);
		return put_user(priv->line_state, (unsigned long *) arg);
 
	case TIOCMSET: // 0x5418
		if (get_user(mask, (unsigned long *) arg)){
			return -EFAULT;
		}
		if (priv->device_type == KOBIL_ADAPTER_B_PRODUCT_ID) {
			if ((mask & TIOCM_DTR) != 0){
				dbg("%s - port %d Setting DTR", __FUNCTION__, port->number);
			} else {
				dbg("%s - port %d Clearing DTR", __FUNCTION__, port->number);
			} 
			result = usb_control_msg( port->serial->dev, 
						  usb_rcvctrlpipe(port->serial->dev, 0 ), 
						  SUSBCRequest_SetStatusLinesOrQueues,
						  USB_TYPE_VENDOR | USB_RECIP_ENDPOINT | USB_DIR_OUT,
						  ( ((mask & TIOCM_DTR) != 0) ? SUSBCR_SSL_SETDTR : SUSBCR_SSL_CLRDTR),
						  0,
						  NULL,
						  0,
						  KOBIL_TIMEOUT
				);
 
		} else {
			if ((mask & TIOCM_RTS) != 0){
				dbg("%s - port %d Setting RTS", __FUNCTION__, port->number);
			} else {
				dbg("%s - port %d Clearing RTS", __FUNCTION__, port->number);
			}
			result = usb_control_msg( port->serial->dev, 
						  usb_rcvctrlpipe(port->serial->dev, 0 ), 
						  SUSBCRequest_SetStatusLinesOrQueues,
						  USB_TYPE_VENDOR | USB_RECIP_ENDPOINT | USB_DIR_OUT,
						  (((mask & TIOCM_RTS) != 0) ? SUSBCR_SSL_SETRTS : SUSBCR_SSL_CLRRTS),
						  0,
						  NULL,
						  0,
						  KOBIL_TIMEOUT
				);
		}
		dbg("%s - port %d Send set_status_line (TIOCMSET) URB returns: %i", __FUNCTION__, port->number, result);
		return ((result < 0) ? -EFAULT : 0);
	}
	return 0;
}
 
 
static int __init kobil_init (void)
{
	usb_serial_register (&kobil_device);
 
	info(DRIVER_VERSION " " DRIVER_AUTHOR);
	info(DRIVER_DESC);
 
	return 0;
}
 
 
static void __exit kobil_exit (void)
{
	usb_serial_deregister (&kobil_device);
}
 
module_init(kobil_init);
module_exit(kobil_exit);
 
MODULE_AUTHOR( DRIVER_AUTHOR );
MODULE_DESCRIPTION( DRIVER_DESC );
MODULE_LICENSE( "GPL" );
 
MODULE_PARM(debug, "i");
MODULE_PARM_DESC(debug, "Debug enabled or not");