[PATCH] USB: add Option Card driver

This patch adds a new driver for "Option" cards.  This is a GSM data card,
controlled by three "serial ports" which are connected via an OHCI adapter,
all located on an oversized PC-Card.  It's sold by several GSM service
providers.

Traditionally, this card has been accessed via the standard serial driver
and appropriate vendor= and product= options.  However, testing has
revealed several problems with this approach, including hung data transfers
and lost data blocks when receiving.

Therefore, I've written a separate driver.
Signed-off-by: Matthias Urlichs <smurf@smurf.noris.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/usb/serial/Kconfig

@@ -455,6 +455,17 @@ config USB_SERIAL_XIRCOM
 	  To compile this driver as a module, choose M here: the
 	  module will be called keyspan_pda.
 
+config USB_SERIAL_OPTION
+	tristate "USB Option PCMCIA serial driver"
+	depends on USB_SERIAL && USB_OHCI_HCD && PCCARD
+	help
+	  Say Y here if you want to use an Option card. This is a
+	  GSM card, controlled by three serial ports which are connected
+	  via an OHCI adapter located on a PC card.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called option.
+
 config USB_SERIAL_OMNINET
 	tristate "USB ZyXEL omni.net LCD Plus Driver (EXPERIMENTAL)"
 	depends on USB_SERIAL && EXPERIMENTAL

drivers/usb/serial/Makefile

@@ -32,6 +32,7 @@ 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_OMNINET)		+= omninet.o
+obj-$(CONFIG_USB_SERIAL_OPTION)			+= option.o
 obj-$(CONFIG_USB_SERIAL_PL2303)			+= pl2303.o
 obj-$(CONFIG_USB_SERIAL_SAFE)			+= safe_serial.o
 obj-$(CONFIG_USB_SERIAL_TI)			+= ti_usb_3410_5052.o

drivers/usb/serial/option.c

+/*
+  Option Card (PCMCIA to) USB to Serial Driver
+
+  Copyright (C) 2005  Matthias Urlichs <smurf@smurf.noris.de>
+
+  This driver is free software; you can redistribute it and/or modify
+  it under the terms of Version 2 of the GNU General Public License as
+  published by the Free Software Foundation.
+
+  Portions copied from the Keyspan driver by Hugh Blemings <hugh@blemings.org>
+
+  History:
+
+  2005-05-19  v0.1   Initial version, based on incomplete docs
+                     and analysis of misbehavior of the standard driver
+  2005-05-20  v0.2   Extended the input buffer to avoid losing
+                     random 64-byte chunks of data
+  2005-05-21  v0.3   implemented chars_in_buffer()
+                     turned on low_latency
+                     simplified the code somewhat
+*/
+#define DRIVER_VERSION "v0.3"
+#define DRIVER_AUTHOR "Matthias Urlichs <smurf@smurf.noris.de>"
+#define DRIVER_DESC "Option Card (PC-Card to) USB to Serial Driver"
+
+#include <linux/config.h>
+#include <linux/kernel.h>
+#include <linux/jiffies.h>
+#include <linux/errno.h>
+#include <linux/tty.h>
+#include <linux/tty_flip.h>
+#include <linux/module.h>
+#include <linux/usb.h>
+#include "usb-serial.h"
+
+/* Function prototypes */
+static int  option_open (struct usb_serial_port *port, struct file *filp);
+static void option_close (struct usb_serial_port *port, struct file *filp);
+static int  option_startup (struct usb_serial *serial);
+static void option_shutdown (struct usb_serial *serial);
+static void option_rx_throttle (struct usb_serial_port *port);
+static void option_rx_unthrottle (struct usb_serial_port *port);
+static int  option_write_room (struct usb_serial_port *port);
+
+static void option_instat_callback(struct urb *urb, struct pt_regs *regs);
+
+
+static int  option_write (struct usb_serial_port *port,
+                          const unsigned char *buf, int count);
+
+static int  option_chars_in_buffer (struct usb_serial_port *port);
+static int  option_ioctl (struct usb_serial_port *port, struct file *file,
+                          unsigned int cmd, unsigned long arg);
+static void option_set_termios (struct usb_serial_port *port,
+                                struct termios *old);
+static void option_break_ctl (struct usb_serial_port *port, int break_state);
+static int  option_tiocmget (struct usb_serial_port *port, struct file *file);
+static int  option_tiocmset (struct usb_serial_port *port, struct file *file,
+                             unsigned int set, unsigned int clear);
+static int  option_send_setup (struct usb_serial_port *port);
+
+/* Vendor and product IDs */
+#define OPTION_VENDOR_ID		0x0AF0
+
+#define	OPTION_PRODUCT_OLD		0x5000
+#define	OPTION_PRODUCT_WLAN		0x6000
+
+static struct usb_device_id option_ids[] = {
+	{ USB_DEVICE(OPTION_VENDOR_ID, OPTION_PRODUCT_OLD) },
+	{ USB_DEVICE(OPTION_VENDOR_ID, OPTION_PRODUCT_WLAN) },
+	{ } /* Terminating entry */
+};
+
+MODULE_DEVICE_TABLE(usb, option_ids);
+
+static struct usb_driver option_driver = {
+	.owner      = THIS_MODULE,
+	.name       = "option",
+	.probe      = usb_serial_probe,
+	.disconnect = usb_serial_disconnect,
+	.id_table   = option_ids,
+};
+
+/* The card has three separate interfaces, wich the serial driver
+ * recognizes separately, thus num_port=1.
+ */
+static struct usb_serial_device_type option_3port_device = {
+	.owner			= THIS_MODULE,
+	.name			= "Option 3-port card",
+	.short_name		= "option",
+	.id_table		= option_ids,
+	.num_interrupt_in	= NUM_DONT_CARE,
+	.num_bulk_in		= NUM_DONT_CARE,
+	.num_bulk_out		= NUM_DONT_CARE,
+	.num_ports		= 1, /* 3 */
+	.open			= option_open,
+	.close			= option_close,
+	.write			= option_write,
+	.write_room		= option_write_room,
+	.chars_in_buffer	= option_chars_in_buffer,
+	.throttle		= option_rx_throttle,
+	.unthrottle		= option_rx_unthrottle,
+	.ioctl			= option_ioctl,
+	.set_termios		= option_set_termios,
+	.break_ctl		= option_break_ctl,
+	.tiocmget		= option_tiocmget,
+	.tiocmset		= option_tiocmset,
+	.attach			= option_startup,
+	.shutdown		= option_shutdown,
+	.read_int_callback	= option_instat_callback,
+};
+
+static int debug;
+
+/* per port private data */
+
+#define N_IN_URB	4
+#define N_OUT_URB	1
+#define IN_BUFLEN	1024
+#define OUT_BUFLEN	1024
+
+struct option_port_private {
+	/* Input endpoints and buffer for this port */
+	struct urb	*in_urbs[N_IN_URB];
+	char		in_buffer[N_IN_URB][IN_BUFLEN];
+	/* Output endpoints and buffer for this port */
+	struct urb	*out_urbs[N_OUT_URB];
+	char		out_buffer[N_OUT_URB][OUT_BUFLEN];
+
+	/* Settings for the port */
+	int		rts_state;	/* Handshaking pins (outputs) */
+	int		dtr_state;
+	int		cts_state;	/* Handshaking pins (inputs) */
+	int		dsr_state;
+	int		dcd_state;
+	int		ri_state;
+	// int		break_on;
+
+	unsigned long	tx_start_time[N_OUT_URB];
+};
+
+
+/* Functions used by new usb-serial code. */
+static int __init
+option_init (void)
+{
+	int retval;
+	retval = usb_serial_register(&option_3port_device);
+	if (retval)
+		goto failed_3port_device_register;
+	retval = usb_register(&option_driver);
+	if (retval)
+		goto failed_driver_register;
+
+	info(DRIVER_DESC ": " DRIVER_VERSION);
+
+	return 0;
+
+failed_driver_register:
+	usb_serial_deregister (&option_3port_device);
+failed_3port_device_register:
+	return retval;
+}
+
+static void __exit
+option_exit (void)
+{
+	usb_deregister (&option_driver);
+	usb_serial_deregister (&option_3port_device);
+}
+
+module_init(option_init);
+module_exit(option_exit);
+
+static void
+option_rx_throttle (struct usb_serial_port *port)
+{
+	dbg("%s", __FUNCTION__);
+}
+
+
+static void
+option_rx_unthrottle (struct usb_serial_port *port)
+{
+	dbg("%s", __FUNCTION__);
+}
+
+
+static void
+option_break_ctl (struct usb_serial_port *port, int break_state)
+{
+	/* Unfortunately, I don't know how to send a break */
+ 	dbg("%s", __FUNCTION__);
+}
+
+
+static void
+option_set_termios (struct usb_serial_port *port,
+				     struct termios *old_termios)
+{
+	dbg("%s", __FUNCTION__);
+
+	option_send_setup(port);
+}
+
+static int
+option_tiocmget(struct usb_serial_port *port, struct file *file)
+{
+	unsigned int			value;
+	struct option_port_private 	*portdata;
+
+	portdata = usb_get_serial_port_data(port);
+
+	value = ((portdata->rts_state) ? TIOCM_RTS : 0) |
+		((portdata->dtr_state) ? TIOCM_DTR : 0) |
+		((portdata->cts_state) ? TIOCM_CTS : 0) |
+		((portdata->dsr_state) ? TIOCM_DSR : 0) |
+		((portdata->dcd_state) ? TIOCM_CAR : 0) |
+		((portdata->ri_state) ? TIOCM_RNG : 0);
+
+	return value;
+}
+
+static int
+option_tiocmset (struct usb_serial_port *port, struct file *file,
+                 unsigned int set, unsigned int clear)
+{
+	struct option_port_private 	*portdata;
+
+	portdata = usb_get_serial_port_data(port);
+
+	if (set & TIOCM_RTS)
+		portdata->rts_state = 1;
+	if (set & TIOCM_DTR)
+		portdata->dtr_state = 1;
+
+	if (clear & TIOCM_RTS)
+		portdata->rts_state = 0;
+	if (clear & TIOCM_DTR)
+		portdata->dtr_state = 0;
+	return option_send_setup(port);
+}
+
+static int
+option_ioctl (struct usb_serial_port *port, struct file *file,
+              unsigned int cmd, unsigned long arg)
+{
+	return -ENOIOCTLCMD;
+}
+
+/* Write */
+static int
+option_write(struct usb_serial_port *port,
+			 const unsigned char *buf, int count)
+{
+	struct option_port_private 	*portdata;
+	int				i;
+	int 				left, todo;
+	struct urb			*this_urb = NULL; /* spurious */
+ 	int 				err;
+
+	portdata = usb_get_serial_port_data(port);
+
+	dbg("%s: write (%d chars)", __FUNCTION__, count);
+
+#if 0
+	spin_lock(&port->lock);
+	if (port->write_urb_busy) {
+		spin_unlock(&port->lock);
+		dbg("%s: already writing", __FUNCTION__);
+		return 0;
+	}
+	port->write_urb_busy = 1;
+	spin_unlock(&port->lock);
+#endif
+
+	i = 0;
+	left = count;
+	while (left>0) {
+		todo = left;
+		if (todo > OUT_BUFLEN)
+			todo = OUT_BUFLEN;
+
+		for (;i < N_OUT_URB; i++) {
+			/* Check we have a valid urb/endpoint before we use it... */
+			this_urb = portdata->out_urbs[i];
+			if (this_urb->status != -EINPROGRESS)
+				break;
+			if (this_urb->transfer_flags & URB_ASYNC_UNLINK)
+				continue;
+			if (time_before(jiffies, portdata->tx_start_time[i] + 10 * HZ))
+				continue;
+			this_urb->transfer_flags |= URB_ASYNC_UNLINK;
+			usb_unlink_urb(this_urb);
+		}
+
+		if (i == N_OUT_URB) {
+			/* no bulk out free! */
+			dbg("%s: no output urb -- left %d", __FUNCTION__,count-left);
+#if 0
+			port->write_urb_busy = 0;
+#endif
+			return count-left;
+		}
+
+		dbg("%s: endpoint %d buf %d", __FUNCTION__, usb_pipeendpoint(this_urb->pipe), i);
+
+		memcpy (this_urb->transfer_buffer, buf, todo);
+
+		/* send the data out the bulk port */
+		this_urb->transfer_buffer_length = todo;
+
+		this_urb->transfer_flags &= ~URB_ASYNC_UNLINK;
+		this_urb->dev = port->serial->dev;
+		err = usb_submit_urb(this_urb, GFP_ATOMIC);
+		if (err) {
+			dbg("usb_submit_urb %p (write bulk) failed (%d,, has %d)", this_urb, err, this_urb->status);
+			continue;
+		}
+		portdata->tx_start_time[i] = jiffies;
+		buf += todo;
+		left -= todo;
+	}
+
+	count -= left;
+#if 0
+	port->write_urb_busy = 0;
+#endif
+	dbg("%s: wrote (did %d)", __FUNCTION__, count);
+	return count;
+}
+
+static void
+option_indat_callback (struct urb *urb, struct pt_regs *regs)
+{
+	int	i, err;
+	int endpoint;
+	struct usb_serial_port *port;
+	struct tty_struct *tty;
+	unsigned char *data = urb->transfer_buffer;
+
+	dbg("%s: %p", __FUNCTION__, urb);
+
+	endpoint = usb_pipeendpoint(urb->pipe);
+	port = (struct usb_serial_port *) urb->context;
+
+	if (urb->status) {
+		dbg("%s: nonzero status: %d on endpoint %02x.",
+		    __FUNCTION__, urb->status, endpoint);
+	} else {
+		tty = port->tty;
+		if (urb->actual_length) {
+			for (i = 0; i < urb->actual_length ; ++i) {
+				if (tty->flip.count >= TTY_FLIPBUF_SIZE)
+					tty_flip_buffer_push(tty);
+				tty_insert_flip_char(tty, data[i], 0);
+			}
+			tty_flip_buffer_push(tty);
+		} else {
+			dbg("%s: empty read urb received", __FUNCTION__);
+		}
+
+		/* Resubmit urb so we continue receiving */
+		if (port->open_count && urb->status != -ESHUTDOWN) {
+			err = usb_submit_urb(urb, GFP_ATOMIC);
+			if (err)
+				printk(KERN_ERR "%s: resubmit read urb failed. (%d)", __FUNCTION__, err);
+		}
+	}
+	return;
+}
+
+static void
+option_outdat_callback (struct urb *urb, struct pt_regs *regs)
+{
+	struct usb_serial_port *port;
+
+	dbg("%s", __FUNCTION__);
+
+	port = (struct usb_serial_port *) urb->context;
+
+	if (port->open_count)
+		schedule_work(&port->work);
+}
+
+static void
+option_instat_callback (struct urb *urb, struct pt_regs *regs)
+{
+	int err;
+	struct usb_serial_port *port = (struct usb_serial_port *) urb->context;
+	struct option_port_private *portdata = usb_get_serial_port_data(port);
+	struct usb_serial *serial = port->serial;
+
+	dbg("%s", __FUNCTION__);
+	dbg("%s: urb %p port %p has data %p", __FUNCTION__,urb,port,portdata);
+
+	if (urb->status == 0) {
+		struct usb_ctrlrequest *req_pkt =
+				(struct usb_ctrlrequest *)urb->transfer_buffer;
+
+		if (!req_pkt) {
+			dbg("%s: NULL req_pkt\n", __FUNCTION__);
+			return;
+		}
+		if ((req_pkt->bRequestType == 0xA1) && (req_pkt->bRequest == 0x20)) {
+			int old_dcd_state;
+			unsigned char signals = *((unsigned char *)
+					urb->transfer_buffer + sizeof(struct usb_ctrlrequest));
+
+			dbg("%s: signal x%x", __FUNCTION__, signals);
+
+			old_dcd_state = portdata->dcd_state;
+			portdata->cts_state = 1;
+			portdata->dcd_state = ((signals & 0x01) ? 1 : 0);
+			portdata->dsr_state = ((signals & 0x02) ? 1 : 0);
+			portdata->ri_state = ((signals & 0x08) ? 1 : 0);
+
+			if (port->tty && !C_CLOCAL(port->tty)
+					&& old_dcd_state && !portdata->dcd_state) {
+				tty_hangup(port->tty);
+			}
+		} else
+			dbg("%s: type %x req %x", __FUNCTION__, req_pkt->bRequestType,req_pkt->bRequest);
+	} else
+		dbg("%s: error %d", __FUNCTION__, urb->status);
+
+	/* Resubmit urb so we continue receiving IRQ data */
+	if (urb->status != -ESHUTDOWN) {
+		urb->dev = serial->dev;
+		err = usb_submit_urb(urb, GFP_ATOMIC);
+		if (err)
+			dbg("%s: resubmit intr urb failed. (%d)", __FUNCTION__, err);
+	}
+}
+
+
+static int
+option_write_room (struct usb_serial_port *port)
+{
+	struct option_port_private *portdata;
+	int i;
+	int data_len = 0;
+	struct urb *this_urb;
+
+	portdata = usb_get_serial_port_data(port);
+
+	for (i=0; i < N_OUT_URB; i++)
+		this_urb = portdata->out_urbs[i];
+		if (this_urb && this_urb->status != -EINPROGRESS)
+			data_len += OUT_BUFLEN;
+
+	dbg("%s: %d", __FUNCTION__, data_len);
+	return data_len;
+}
+
+
+static int
+option_chars_in_buffer (struct usb_serial_port *port)
+{
+	struct option_port_private *portdata;
+	int i;
+	int data_len = 0;
+	struct urb *this_urb;
+
+	portdata = usb_get_serial_port_data(port);
+
+	for (i=0; i < N_OUT_URB; i++)
+		this_urb = portdata->out_urbs[i];
+		if (this_urb && this_urb->status == -EINPROGRESS)
+			data_len += this_urb->transfer_buffer_length;
+
+	dbg("%s: %d", __FUNCTION__, data_len);
+	return data_len;
+}
+
+
+static int
+option_open (struct usb_serial_port *port, struct file *filp)
+{
+	struct option_port_private 	*portdata;
+	struct usb_serial 		*serial = port->serial;
+	int				i, err;
+	struct urb			*urb;
+
+	portdata = usb_get_serial_port_data(port);
+
+	dbg("%s", __FUNCTION__);
+
+	/* Set some sane defaults */
+	portdata->rts_state = 1;
+	portdata->dtr_state = 1;
+
+	/* Reset low level data toggle and start reading from endpoints */
+	for (i = 0; i < N_IN_URB; i++) {
+		urb = portdata->in_urbs[i];
+		if (! urb)
+			continue;
+		if (urb->dev != serial->dev) {
+			dbg("%s: dev %p != %p", __FUNCTION__, urb->dev, serial->dev);
+			continue;
+		}
+
+		/* make sure endpoint data toggle is synchronized with the device */
+
+		usb_clear_halt(urb->dev, urb->pipe);
+
+		err = usb_submit_urb(urb, GFP_KERNEL);
+		if (err) {
+			dbg("%s: submit urb %d failed (%d) %d", __FUNCTION__, i, err,
+				urb->transfer_buffer_length);
+		}
+	}
+
+	/* Reset low level data toggle on out endpoints */
+	for (i = 0; i < N_OUT_URB; i++) {
+		urb = portdata->out_urbs[i];
+		if (! urb)
+			continue;
+		urb->dev = serial->dev;
+		/* usb_settoggle(urb->dev, usb_pipeendpoint(urb->pipe), usb_pipeout(urb->pipe), 0); */
+	}
+
+	port->tty->low_latency = 1;
+
+	option_send_setup(port);
+
+	return (0);
+}
+
+static inline void
+stop_urb(struct urb *urb)
+{
+	if (urb && urb->status == -EINPROGRESS) {
+		urb->transfer_flags &= ~URB_ASYNC_UNLINK;
+		usb_kill_urb(urb);
+	}
+}
+
+static void
+option_close(struct usb_serial_port *port, struct file *filp)
+{
+	int			i;
+	struct usb_serial	*serial = port->serial;
+	struct option_port_private 	*portdata;
+
+	dbg("%s", __FUNCTION__);
+	portdata = usb_get_serial_port_data(port);
+
+	portdata->rts_state = 0;
+	portdata->dtr_state = 0;
+
+	if (serial->dev) {
+		option_send_setup(port);
+
+		/* Stop reading/writing urbs */
+		for (i = 0; i < N_IN_URB; i++)
+			stop_urb(portdata->in_urbs[i]);
+		for (i = 0; i < N_OUT_URB; i++)
+			stop_urb(portdata->out_urbs[i]);
+	}
+	port->tty = NULL;
+}
+
+
+/* Helper functions used by option_setup_urbs */
+static struct urb *
+option_setup_urb (struct usb_serial *serial, int endpoint,
+                  int dir, void *ctx, char *buf, int len,
+                  void (*callback)(struct urb *, struct pt_regs *regs))
+{
+	struct urb *urb;
+
+	if (endpoint == -1)
+		return NULL;		/* endpoint not needed */
+
+	urb = usb_alloc_urb(0, GFP_KERNEL);		/* No ISO */
+	if (urb == NULL) {
+		dbg("%s: alloc for endpoint %d failed.", __FUNCTION__, endpoint);
+		return NULL;
+	}
+
+		/* Fill URB using supplied data. */
+	usb_fill_bulk_urb(urb, serial->dev,
+		      usb_sndbulkpipe(serial->dev, endpoint) | dir,
+		      buf, len, callback, ctx);
+
+	return urb;
+}
+
+/* Setup urbs */
+static void
+option_setup_urbs(struct usb_serial *serial)
+{
+	int				j;
+	struct usb_serial_port		*port;
+	struct option_port_private	*portdata;
+
+	dbg("%s", __FUNCTION__);
+
+	port = serial->port[0];
+	portdata = usb_get_serial_port_data(port);
+
+	/* Do indat endpoints first */
+	for (j = 0; j <= N_IN_URB; ++j) {
+		portdata->in_urbs[j] = option_setup_urb (serial,
+                  port->bulk_in_endpointAddress, USB_DIR_IN, port,
+                  portdata->in_buffer[j], IN_BUFLEN, option_indat_callback);
+	}
+
+	/* outdat endpoints */
+	for (j = 0; j <= N_OUT_URB; ++j) {
+		portdata->out_urbs[j] = option_setup_urb (serial,
+                  port->bulk_out_endpointAddress, USB_DIR_OUT, port,
+                  portdata->out_buffer[j], OUT_BUFLEN, option_outdat_callback);
+	}
+}
+
+
+static int
+option_send_setup(struct usb_serial_port *port)
+{
+	struct usb_serial *serial = port->serial;
+	struct option_port_private *portdata;
+
+	dbg("%s", __FUNCTION__);
+
+	portdata = usb_get_serial_port_data(port);
+
+	if (port->tty) {
+		int val = 0;
+		if (portdata->dtr_state)
+			val |= 0x01;
+		if (portdata->rts_state)
+			val |= 0x02;
+
+		return usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
+					0x22,0x21,val,0,NULL,0,USB_CTRL_SET_TIMEOUT);
+	}
+
+	return 0;
+}
+
+
+static int
+option_startup (struct usb_serial *serial)
+{
+	int				i, err;
+	struct usb_serial_port		*port;
+	struct option_port_private	*portdata;
+
+	dbg("%s", __FUNCTION__);
+
+	/* Now setup per port private data */
+	for (i = 0; i < serial->num_ports; i++) {
+		port = serial->port[i];
+		portdata = kmalloc(sizeof(struct option_port_private), GFP_KERNEL);
+		if (!portdata) {
+			dbg("%s: kmalloc for option_port_private (%d) failed!.", __FUNCTION__, i);
+			return (1);
+		}
+		memset(portdata, 0, sizeof(struct option_port_private));
+
+		usb_set_serial_port_data(port, portdata);
+
+		if (! port->interrupt_in_urb)
+			continue;
+		err = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
+		if (err)
+			dbg("%s: submit irq_in urb failed %d", __FUNCTION__, err);
+	}
+
+	option_setup_urbs(serial);
+
+	return (0);
+}
+
+static void
+option_shutdown (struct usb_serial *serial)
+{
+	int				i, j;
+	struct usb_serial_port		*port;
+	struct option_port_private	*portdata;
+
+	dbg("%s", __FUNCTION__);
+
+	/* Stop reading/writing urbs */
+	for (i = 0; i < serial->num_ports; ++i) {
+		port = serial->port[i];
+		portdata = usb_get_serial_port_data(port);
+		for (j = 0; j < N_IN_URB; j++)
+			stop_urb(portdata->in_urbs[j]);
+		for (j = 0; j < N_OUT_URB; j++)
+			stop_urb(portdata->out_urbs[j]);
+	}
+
+	/* Now free them */
+	for (i = 0; i < serial->num_ports; ++i) {
+		port = serial->port[i];
+		portdata = usb_get_serial_port_data(port);
+
+		for (j = 0; j < N_IN_URB; j++) {
+			if (portdata->in_urbs[j]) {
+				usb_free_urb(portdata->in_urbs[j]);
+				portdata->in_urbs[j] = NULL;
+			}
+		}
+		for (j = 0; j < N_OUT_URB; j++) {
+			if (portdata->out_urbs[j]) {
+				usb_free_urb(portdata->out_urbs[j]);
+				portdata->out_urbs[j] = NULL;
+			}
+		}
+	}
+
+	/* Now free per port private data */
+	for (i = 0; i < serial->num_ports; i++) {
+		port = serial->port[i];
+		kfree(usb_get_serial_port_data(port));
+	}
+}
+
+MODULE_AUTHOR(DRIVER_AUTHOR);
+MODULE_DESCRIPTION(DRIVER_DESC);
+MODULE_VERSION(DRIVER_VERSION);
+MODULE_LICENSE("GPL");
+
+module_param(debug, bool, S_IRUGO | S_IWUSR);
+MODULE_PARM_DESC(debug, "Debug messages");
+