Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 1435 insertions, 0 deletions

diff --git a/drivers/usb/serial/usb-serial.c b/drivers/usb/serial/usb-serial.c
new file mode 100644
index 00000000000..4536f63faae
--- /dev/null
+++ b/drivers/usb/serial/usb-serial.c
@@ -0,0 +1,1435 @@
+/*
+ * USB Serial Converter driver
+ *
+ * Copyright (C) 1999 - 2004 Greg Kroah-Hartman (greg@kroah.com)
+ * Copyright (C) 2000 Peter Berger (pberger@brimson.com)
+ * Copyright (C) 2000 Al Borchers (borchers@steinerpoint.com)
+ *
+ *	This program is free software; you can redistribute it and/or
+ *	modify it under the terms of the GNU General Public License version
+ *	2 as published by the Free Software Foundation.
+ *
+ * This driver was originally based on the ACM driver by Armin Fuerst (which was 
+ * based on a driver by Brad Keryan)
+ *
+ * See Documentation/usb/usb-serial.txt for more information on using this driver
+ *
+ * (12/10/2002) gkh
+ *	Split the ports off into their own struct device, and added a
+ *	usb-serial bus driver.
+ *
+ * (11/19/2002) gkh
+ *	removed a few #ifdefs for the generic code and cleaned up the failure
+ *	logic in initialization.
+ *
+ * (10/02/2002) gkh
+ *	moved the console code to console.c and out of this file.
+ *
+ * (06/05/2002) gkh
+ *	moved location of startup() call in serial_probe() until after all
+ *	of the port information and endpoints are initialized.  This makes
+ *	things easier for some drivers.
+ *
+ * (04/10/2002) gkh
+ *	added serial_read_proc function which creates a
+ *	/proc/tty/driver/usb-serial file.
+ *
+ * (03/27/2002) gkh
+ *	Got USB serial console code working properly and merged into the main
+ *	version of the tree.  Thanks to Randy Dunlap for the initial version
+ *	of this code, and for pushing me to finish it up.
+ *	The USB serial console works with any usb serial driver device.
+ *
+ * (03/21/2002) gkh
+ *	Moved all manipulation of port->open_count into the core.  Now the
+ *	individual driver's open and close functions are called only when the
+ *	first open() and last close() is called.  Making the drivers a bit
+ *	smaller and simpler.
+ *	Fixed a bug if a driver didn't have the owner field set.
+ *
+ * (02/26/2002) gkh
+ *	Moved all locking into the main serial_* functions, instead of having 
+ *	the individual drivers have to grab the port semaphore.  This should
+ *	reduce races.
+ *	Reworked the MOD_INC logic a bit to always increment and decrement, even
+ *	if the generic driver is being used.
+ *
+ * (10/10/2001) gkh
+ *	usb_serial_disconnect() now sets the serial->dev pointer is to NULL to
+ *	help prevent child drivers from accessing the device since it is now
+ *	gone.
+ *
+ * (09/13/2001) gkh
+ *	Moved generic driver initialize after we have registered with the USB
+ *	core.  Thanks to Randy Dunlap for pointing this problem out.
+ *
+ * (07/03/2001) gkh
+ *	Fixed module paramater size.  Thanks to John Brockmeyer for the pointer.
+ *	Fixed vendor and product getting defined through the MODULE_PARM macro
+ *	if the Generic driver wasn't compiled in.
+ *	Fixed problem with generic_shutdown() not being called for drivers that
+ *	don't have a shutdown() function.
+ *
+ * (06/06/2001) gkh
+ *	added evil hack that is needed for the prolific pl2303 device due to the
+ *	crazy way its endpoints are set up.
+ *
+ * (05/30/2001) gkh
+ *	switched from using spinlock to a semaphore, which fixes lots of problems.
+ *
+ * (04/08/2001) gb
+ *	Identify version on module load.
+ *
+ * 2001_02_05 gkh
+ *	Fixed buffer overflows bug with the generic serial driver.  Thanks to
+ *	Todd Squires <squirest@ct0.com> for fixing this.
+ *
+ * (01/10/2001) gkh
+ *	Fixed bug where the generic serial adaptor grabbed _any_ device that was
+ *	offered to it.
+ *
+ * (12/12/2000) gkh
+ *	Removed MOD_INC and MOD_DEC from poll and disconnect functions, and
+ *	moved them to the serial_open and serial_close functions.
+ *	Also fixed bug with there not being a MOD_DEC for the generic driver
+ *	(thanks to Gary Brubaker for finding this.)
+ *
+ * (11/29/2000) gkh
+ *	Small NULL pointer initialization cleanup which saves a bit of disk image
+ *
+ * (11/01/2000) Adam J. Richter
+ *	instead of using idVendor/idProduct pairs, usb serial drivers
+ *	now identify their hardware interest with usb_device_id tables,
+ *	which they usually have anyhow for use with MODULE_DEVICE_TABLE.
+ *
+ * (10/05/2000) gkh
+ *	Fixed bug with urb->dev not being set properly, now that the usb
+ *	core needs it.
+ * 
+ * (09/11/2000) gkh
+ *	Removed DEBUG #ifdefs with call to usb_serial_debug_data
+ *
+ * (08/28/2000) gkh
+ *	Added port_lock to port structure.
+ *	Added locks for SMP safeness to generic driver
+ *	Fixed the ability to open a generic device's port more than once.
+ *
+ * (07/23/2000) gkh
+ *	Added bulk_out_endpointAddress to port structure.
+ *
+ * (07/19/2000) gkh, pberger, and borchers
+ *	Modifications to allow usb-serial drivers to be modules.
+ *
+ * (07/03/2000) gkh
+ *	Added more debugging to serial_ioctl call
+ * 
+ * (06/25/2000) gkh
+ *	Changed generic_write_bulk_callback to not call wake_up_interruptible
+ *	directly, but to have port_softint do it at a safer time.
+ *
+ * (06/23/2000) gkh
+ *	Cleaned up debugging statements in a quest to find UHCI timeout bug.
+ *
+ * (05/22/2000) gkh
+ *	Changed the makefile, enabling the big CONFIG_USB_SERIAL_SOMTHING to be 
+ *	removed from the individual device source files.
+ *
+ * (05/03/2000) gkh
+ *	Added the Digi Acceleport driver from Al Borchers and Peter Berger.
+ * 
+ * (05/02/2000) gkh
+ *	Changed devfs and tty register code to work properly now. This was based on
+ *	the ACM driver changes by Vojtech Pavlik.
+ *
+ * (04/27/2000) Ryan VanderBijl
+ * 	Put calls to *_paranoia_checks into one function.
+ * 
+ * (04/23/2000) gkh
+ *	Fixed bug that Randy Dunlap found for Generic devices with no bulk out ports.
+ *	Moved when the startup code printed out the devices that are supported.
+ *
+ * (04/19/2000) gkh
+ *	Added driver for ZyXEL omni.net lcd plus ISDN TA
+ *	Made startup info message specify which drivers were compiled in.
+ *
+ * (04/03/2000) gkh
+ *	Changed the probe process to remove the module unload races.
+ *	Changed where the tty layer gets initialized to have devfs work nicer.
+ *	Added initial devfs support.
+ *
+ * (03/26/2000) gkh
+ *	Split driver up into device specific pieces.
+ * 
+ * (03/19/2000) gkh
+ *	Fixed oops that could happen when device was removed while a program
+ *	was talking to the device.
+ *	Removed the static urbs and now all urbs are created and destroyed
+ *	dynamically.
+ *	Reworked the internal interface. Now everything is based on the 
+ *	usb_serial_port structure instead of the larger usb_serial structure.
+ *	This fixes the bug that a multiport device could not have more than
+ *	one port open at one time.
+ *
+ * (03/17/2000) gkh
+ *	Added config option for debugging messages.
+ *	Added patch for keyspan pda from Brian Warner.
+ *
+ * (03/06/2000) gkh
+ *	Added the keyspan pda code from Brian Warner <warner@lothar.com>
+ *	Moved a bunch of the port specific stuff into its own structure. This
+ *	is in anticipation of the true multiport devices (there's a bug if you
+ *	try to access more than one port of any multiport device right now)
+ *
+ * (02/21/2000) gkh
+ *	Made it so that any serial devices only have to specify which functions
+ *	they want to overload from the generic function calls (great, 
+ *	inheritance in C, in a driver, just what I wanted...)
+ *	Added support for set_termios and ioctl function calls. No drivers take
+ *	advantage of this yet.
+ *	Removed the #ifdef MODULE, now there is no module specific code.
+ *	Cleaned up a few comments in usb-serial.h that were wrong (thanks again
+ *	to Miles Lott).
+ *	Small fix to get_free_serial.
+ *
+ * (02/14/2000) gkh
+ *	Removed the Belkin and Peracom functionality from the driver due to
+ *	the lack of support from the vendor, and me not wanting people to 
+ *	accidenatly buy the device, expecting it to work with Linux.
+ *	Added read_bulk_callback and write_bulk_callback to the type structure
+ *	for the needs of the FTDI and WhiteHEAT driver.
+ *	Changed all reverences to FTDI to FTDI_SIO at the request of Bill
+ *	Ryder.
+ *	Changed the output urb size back to the max endpoint size to make
+ *	the ftdi_sio driver have it easier, and due to the fact that it didn't
+ *	really increase the speed any.
+ *
+ * (02/11/2000) gkh
+ *	Added VISOR_FUNCTION_CONSOLE to the visor startup function. This was a
+ *	patch from Miles Lott (milos@insync.net).
+ *	Fixed bug with not restoring the minor range that a device grabs, if
+ *	the startup function fails (thanks Miles for finding this).
+ *
+ * (02/05/2000) gkh
+ *	Added initial framework for the Keyspan PDA serial converter so that
+ *	Brian Warner has a place to put his code.
+ *	Made the ezusb specific functions generic enough that different
+ *	devices can use them (whiteheat and keyspan_pda both need them).
+ *	Split out a whole bunch of structure and other stuff to a separate
+ *	usb-serial.h file.
+ *	Made the Visor connection messages a little more understandable, now
+ *	that Miles Lott (milos@insync.net) has gotten the Generic channel to
+ *	work. Also made them always show up in the log file.
+ * 
+ * (01/25/2000) gkh
+ *	Added initial framework for FTDI serial converter so that Bill Ryder
+ *	has a place to put his code.
+ *	Added the vendor specific info from Handspring. Now we can print out
+ *	informational debug messages as well as understand what is happening.
+ *
+ * (01/23/2000) gkh
+ *	Fixed problem of crash when trying to open a port that didn't have a
+ *	device assigned to it. Made the minor node finding a little smarter,
+ *	now it looks to find a continuous space for the new device.
+ *
+ * (01/21/2000) gkh
+ *	Fixed bug in visor_startup with patch from Miles Lott (milos@insync.net)
+ *	Fixed get_serial_by_minor which was all messed up for multi port 
+ *	devices. Fixed multi port problem for generic devices. Now the number
+ *	of ports is determined by the number of bulk out endpoints for the
+ *	generic device.
+ *
+ * (01/19/2000) gkh
+ *	Removed lots of cruft that was around from the old (pre urb) driver 
+ *	interface.
+ *	Made the serial_table dynamic. This should save lots of memory when
+ *	the number of minor nodes goes up to 256.
+ *	Added initial support for devices that have more than one port. 
+ *	Added more debugging comments for the Visor, and added a needed 
+ *	set_configuration call.
+ *
+ * (01/17/2000) gkh
+ *	Fixed the WhiteHEAT firmware (my processing tool had a bug)
+ *	and added new debug loader firmware for it.
+ *	Removed the put_char function as it isn't really needed.
+ *	Added visor startup commands as found by the Win98 dump.
+ * 
+ * (01/13/2000) gkh
+ *	Fixed the vendor id for the generic driver to the one I meant it to be.
+ *
+ * (01/12/2000) gkh
+ *	Forget the version numbering...that's pretty useless...
+ *	Made the driver able to be compiled so that the user can select which
+ *	converter they want to use. This allows people who only want the Visor
+ *	support to not pay the memory size price of the WhiteHEAT.
+ *	Fixed bug where the generic driver (idVendor=0000 and idProduct=0000)
+ *	grabbed the root hub. Not good.
+ * 
+ * version 0.4.0 (01/10/2000) gkh
+ *	Added whiteheat.h containing the firmware for the ConnectTech WhiteHEAT
+ *	device. Added startup function to allow firmware to be downloaded to
+ *	a device if it needs to be.
+ *	Added firmware download logic to the WhiteHEAT device.
+ *	Started to add #defines to split up the different drivers for potential
+ *	configuration option.
+ *	
+ * version 0.3.1 (12/30/99) gkh
+ *      Fixed problems with urb for bulk out.
+ *      Added initial support for multiple sets of endpoints. This enables
+ *      the Handspring Visor to be attached successfully. Only the first
+ *      bulk in / bulk out endpoint pair is being used right now.
+ *
+ * version 0.3.0 (12/27/99) gkh
+ *	Added initial support for the Handspring Visor based on a patch from
+ *	Miles Lott (milos@sneety.insync.net)
+ *	Cleaned up the code a bunch and converted over to using urbs only.
+ *
+ * version 0.2.3 (12/21/99) gkh
+ *	Added initial support for the Connect Tech WhiteHEAT converter.
+ *	Incremented the number of ports in expectation of getting the
+ *	WhiteHEAT to work properly (4 ports per connection).
+ *	Added notification on insertion and removal of what port the
+ *	device is/was connected to (and what kind of device it was).
+ *
+ * version 0.2.2 (12/16/99) gkh
+ *	Changed major number to the new allocated number. We're legal now!
+ *
+ * version 0.2.1 (12/14/99) gkh
+ *	Fixed bug that happens when device node is opened when there isn't a
+ *	device attached to it. Thanks to marek@webdesign.no for noticing this.
+ *
+ * version 0.2.0 (11/10/99) gkh
+ *	Split up internals to make it easier to add different types of serial 
+ *	converters to the code.
+ *	Added a "generic" driver that gets it's vendor and product id
+ *	from when the module is loaded. Thanks to David E. Nelson (dnelson@jump.net)
+ *	for the idea and sample code (from the usb scanner driver.)
+ *	Cleared up any licensing questions by releasing it under the GNU GPL.
+ *
+ * version 0.1.2 (10/25/99) gkh
+ * 	Fixed bug in detecting device.
+ *
+ * version 0.1.1 (10/05/99) gkh
+ * 	Changed the major number to not conflict with anything else.
+ *
+ * version 0.1 (09/28/99) gkh
+ * 	Can recognize the two different devices and start up a read from
+ *	device when asked to. Writes also work. No control signals yet, this
+ *	all is vendor specific data (i.e. no spec), also no control for
+ *	different baud rates or other bit settings.
+ *	Currently we are using the same devid as the acm driver. This needs
+ *	to change.
+ * 
+ */
+
+#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/moduleparam.h>
+#include <linux/spinlock.h>
+#include <linux/list.h>
+#include <linux/smp_lock.h>
+#include <asm/uaccess.h>
+#include <linux/usb.h>
+#include "usb-serial.h"
+#include "pl2303.h"
+
+/*
+ * Version Information
+ */
+#define DRIVER_VERSION "v2.0"
+#define DRIVER_AUTHOR "Greg Kroah-Hartman, greg@kroah.com, http://www.kroah.com/linux/"
+#define DRIVER_DESC "USB Serial Driver core"
+
+/* Driver structure we register with the USB core */
+static struct usb_driver usb_serial_driver = {
+	.owner =	THIS_MODULE,
+	.name =		"usbserial",
+	.probe =	usb_serial_probe,
+	.disconnect =	usb_serial_disconnect,
+};
+
+/* There is no MODULE_DEVICE_TABLE for usbserial.c.  Instead
+   the MODULE_DEVICE_TABLE declarations in each serial driver
+   cause the "hotplug" program to pull in whatever module is necessary
+   via modprobe, and modprobe will load usbserial because the serial
+   drivers depend on it.
+*/
+
+static int debug;
+static struct usb_serial *serial_table[SERIAL_TTY_MINORS];	/* initially all NULL */
+static LIST_HEAD(usb_serial_driver_list);
+
+struct usb_serial *usb_serial_get_by_index(unsigned index)
+{
+	struct usb_serial *serial = serial_table[index];
+
+	if (serial)
+		kref_get(&serial->kref);
+	return serial;
+}
+
+static struct usb_serial *get_free_serial (struct usb_serial *serial, int num_ports, unsigned int *minor)
+{
+	unsigned int i, j;
+	int good_spot;
+
+	dbg("%s %d", __FUNCTION__, num_ports);
+
+	*minor = 0;
+	for (i = 0; i < SERIAL_TTY_MINORS; ++i) {
+		if (serial_table[i])
+			continue;
+
+		good_spot = 1;
+		for (j = 1; j <= num_ports-1; ++j)
+			if ((i+j >= SERIAL_TTY_MINORS) || (serial_table[i+j])) {
+				good_spot = 0;
+				i += j;
+				break;
+			}
+		if (good_spot == 0)
+			continue;
+
+		*minor = i;
+		dbg("%s - minor base = %d", __FUNCTION__, *minor);
+		for (i = *minor; (i < (*minor + num_ports)) && (i < SERIAL_TTY_MINORS); ++i)
+			serial_table[i] = serial;
+		return serial;
+	}
+	return NULL;
+}
+
+static void return_serial(struct usb_serial *serial)
+{
+	int i;
+
+	dbg("%s", __FUNCTION__);
+
+	if (serial == NULL)
+		return;
+
+	for (i = 0; i < serial->num_ports; ++i) {
+		serial_table[serial->minor + i] = NULL;
+	}
+}
+
+static void destroy_serial(struct kref *kref)
+{
+	struct usb_serial *serial;
+	struct usb_serial_port *port;
+	int i;
+
+	serial = to_usb_serial(kref);
+
+	dbg ("%s - %s", __FUNCTION__, serial->type->name);
+
+	serial->type->shutdown(serial);
+
+	/* return the minor range that this device had */
+	return_serial(serial);
+
+	for (i = 0; i < serial->num_ports; ++i)
+		serial->port[i]->open_count = 0;
+
+	/* the ports are cleaned up and released in port_release() */
+	for (i = 0; i < serial->num_ports; ++i)
+		if (serial->port[i]->dev.parent != NULL) {
+			device_unregister(&serial->port[i]->dev);
+			serial->port[i] = NULL;
+		}
+
+	/* If this is a "fake" port, we have to clean it up here, as it will
+	 * not get cleaned up in port_release() as it was never registered with
+	 * the driver core */
+	if (serial->num_ports < serial->num_port_pointers) {
+		for (i = serial->num_ports; i < serial->num_port_pointers; ++i) {
+			port = serial->port[i];
+			if (!port)
+				continue;
+			usb_kill_urb(port->read_urb);
+			usb_free_urb(port->read_urb);
+			usb_kill_urb(port->write_urb);
+			usb_free_urb(port->write_urb);
+			usb_kill_urb(port->interrupt_in_urb);
+			usb_free_urb(port->interrupt_in_urb);
+			usb_kill_urb(port->interrupt_out_urb);
+			usb_free_urb(port->interrupt_out_urb);
+			kfree(port->bulk_in_buffer);
+			kfree(port->bulk_out_buffer);
+			kfree(port->interrupt_in_buffer);
+			kfree(port->interrupt_out_buffer);
+		}
+	}
+
+	usb_put_dev(serial->dev);
+
+	/* free up any memory that we allocated */
+	kfree (serial);
+}
+
+/*****************************************************************************
+ * Driver tty interface functions
+ *****************************************************************************/
+static int serial_open (struct tty_struct *tty, struct file * filp)
+{
+	struct usb_serial *serial;
+	struct usb_serial_port *port;
+	unsigned int portNumber;
+	int retval;
+	
+	dbg("%s", __FUNCTION__);
+
+	/* get the serial object associated with this tty pointer */
+	serial = usb_serial_get_by_index(tty->index);
+	if (!serial) {
+		tty->driver_data = NULL;
+		return -ENODEV;
+	}
+
+	portNumber = tty->index - serial->minor;
+	port = serial->port[portNumber];
+	 
+	++port->open_count;
+
+	if (port->open_count == 1) {
+
+		/* set up our port structure making the tty driver
+		 * remember our port object, and us it */
+		tty->driver_data = port;
+		port->tty = tty;
+
+		/* lock this module before we call it
+		 * this may fail, which means we must bail out,
+		 * safe because we are called with BKL held */
+		if (!try_module_get(serial->type->owner)) {
+			retval = -ENODEV;
+			goto bailout_kref_put;
+		}
+
+		/* only call the device specific open if this 
+		 * is the first time the port is opened */
+		retval = serial->type->open(port, filp);
+		if (retval)
+			goto bailout_module_put;
+	}
+
+	return 0;
+
+bailout_module_put:
+	module_put(serial->type->owner);
+bailout_kref_put:
+	kref_put(&serial->kref, destroy_serial);
+	port->open_count = 0;
+	return retval;
+}
+
+static void serial_close(struct tty_struct *tty, struct file * filp)
+{
+	struct usb_serial_port *port = (struct usb_serial_port *) tty->driver_data;
+
+	if (!port)
+		return;
+
+	dbg("%s - port %d", __FUNCTION__, port->number);
+
+	if (port->open_count == 0)
+		return;
+
+	--port->open_count;
+	if (port->open_count == 0) {
+		/* only call the device specific close if this 
+		 * port is being closed by the last owner */
+		port->serial->type->close(port, filp);
+
+		if (port->tty) {
+			if (port->tty->driver_data)
+				port->tty->driver_data = NULL;
+			port->tty = NULL;
+		}
+
+		module_put(port->serial->type->owner);
+	}
+
+	kref_put(&port->serial->kref, destroy_serial);
+}
+
+static int serial_write (struct tty_struct * tty, const unsigned char *buf, int count)
+{
+	struct usb_serial_port *port = (struct usb_serial_port *) tty->driver_data;
+	int retval = -EINVAL;
+
+	dbg("%s - port %d, %d byte(s)", __FUNCTION__, port->number, count);
+
+	if (!port->open_count) {
+		dbg("%s - port not opened", __FUNCTION__);
+		goto exit;
+	}
+
+	/* pass on to the driver specific version of this function */
+	retval = port->serial->type->write(port, buf, count);
+
+exit:
+	return retval;
+}
+
+static int serial_write_room (struct tty_struct *tty) 
+{
+	struct usb_serial_port *port = (struct usb_serial_port *) tty->driver_data;
+	int retval = -EINVAL;
+
+	dbg("%s - port %d", __FUNCTION__, port->number);
+
+	if (!port->open_count) {
+		dbg("%s - port not open", __FUNCTION__);
+		goto exit;
+	}
+
+	/* pass on to the driver specific version of this function */
+	retval = port->serial->type->write_room(port);
+
+exit:
+	return retval;
+}
+
+static int serial_chars_in_buffer (struct tty_struct *tty) 
+{
+	struct usb_serial_port *port = (struct usb_serial_port *) tty->driver_data;
+	int retval = -EINVAL;
+
+	dbg("%s = port %d", __FUNCTION__, port->number);
+
+	if (!port->open_count) {
+		dbg("%s - port not open", __FUNCTION__);
+		goto exit;
+	}
+
+	/* pass on to the driver specific version of this function */
+	retval = port->serial->type->chars_in_buffer(port);
+
+exit:
+	return retval;
+}
+
+static void serial_throttle (struct tty_struct * tty)
+{
+	struct usb_serial_port *port = (struct usb_serial_port *) tty->driver_data;
+
+	dbg("%s - port %d", __FUNCTION__, port->number);
+
+	if (!port->open_count) {
+		dbg ("%s - port not open", __FUNCTION__);
+		return;
+	}
+
+	/* pass on to the driver specific version of this function */
+	if (port->serial->type->throttle)
+		port->serial->type->throttle(port);
+}
+
+static void serial_unthrottle (struct tty_struct * tty)
+{
+	struct usb_serial_port *port = (struct usb_serial_port *) tty->driver_data;
+
+	dbg("%s - port %d", __FUNCTION__, port->number);
+
+	if (!port->open_count) {
+		dbg("%s - port not open", __FUNCTION__);
+		return;
+	}
+
+	/* pass on to the driver specific version of this function */
+	if (port->serial->type->unthrottle)
+		port->serial->type->unthrottle(port);
+}
+
+static int serial_ioctl (struct tty_struct *tty, struct file * file, unsigned int cmd, unsigned long arg)
+{
+	struct usb_serial_port *port = (struct usb_serial_port *) tty->driver_data;
+	int retval = -ENODEV;
+
+	dbg("%s - port %d, cmd 0x%.4x", __FUNCTION__, port->number, cmd);
+
+	if (!port->open_count) {
+		dbg ("%s - port not open", __FUNCTION__);
+		goto exit;
+	}
+
+	/* pass on to the driver specific version of this function if it is available */
+	if (port->serial->type->ioctl)
+		retval = port->serial->type->ioctl(port, file, cmd, arg);
+	else
+		retval = -ENOIOCTLCMD;
+
+exit:
+	return retval;
+}
+
+static void serial_set_termios (struct tty_struct *tty, struct termios * old)
+{
+	struct usb_serial_port *port = (struct usb_serial_port *) tty->driver_data;
+
+	dbg("%s - port %d", __FUNCTION__, port->number);
+
+	if (!port->open_count) {
+		dbg("%s - port not open", __FUNCTION__);
+		return;
+	}
+
+	/* pass on to the driver specific version of this function if it is available */
+	if (port->serial->type->set_termios)
+		port->serial->type->set_termios(port, old);
+}
+
+static void serial_break (struct tty_struct *tty, int break_state)
+{
+	struct usb_serial_port *port = (struct usb_serial_port *) tty->driver_data;
+
+	dbg("%s - port %d", __FUNCTION__, port->number);
+
+	if (!port->open_count) {
+		dbg("%s - port not open", __FUNCTION__);
+		return;
+	}
+
+	/* pass on to the driver specific version of this function if it is available */
+	if (port->serial->type->break_ctl)
+		port->serial->type->break_ctl(port, break_state);
+}
+
+static int serial_read_proc (char *page, char **start, off_t off, int count, int *eof, void *data)
+{
+	struct usb_serial *serial;
+	int length = 0;
+	int i;
+	off_t begin = 0;
+	char tmp[40];
+
+	dbg("%s", __FUNCTION__);
+	length += sprintf (page, "usbserinfo:1.0 driver:%s\n", DRIVER_VERSION);
+	for (i = 0; i < SERIAL_TTY_MINORS && length < PAGE_SIZE; ++i) {
+		serial = usb_serial_get_by_index(i);
+		if (serial == NULL)
+			continue;
+
+		length += sprintf (page+length, "%d:", i);
+		if (serial->type->owner)
+			length += sprintf (page+length, " module:%s", module_name(serial->type->owner));
+		length += sprintf (page+length, " name:\"%s\"", serial->type->name);
+		length += sprintf (page+length, " vendor:%04x product:%04x", 
+				   le16_to_cpu(serial->dev->descriptor.idVendor), 
+				   le16_to_cpu(serial->dev->descriptor.idProduct));
+		length += sprintf (page+length, " num_ports:%d", serial->num_ports);
+		length += sprintf (page+length, " port:%d", i - serial->minor + 1);
+
+		usb_make_path(serial->dev, tmp, sizeof(tmp));
+		length += sprintf (page+length, " path:%s", tmp);
+			
+		length += sprintf (page+length, "\n");
+		if ((length + begin) > (off + count))
+			goto done;
+		if ((length + begin) < off) {
+			begin += length;
+			length = 0;
+		}
+		kref_put(&serial->kref, destroy_serial);
+	}
+	*eof = 1;
+done:
+	if (off >= (length + begin))
+		return 0;
+	*start = page + (off-begin);
+	return ((count < begin+length-off) ? count : begin+length-off);
+}
+
+static int serial_tiocmget (struct tty_struct *tty, struct file *file)
+{
+	struct usb_serial_port *port = (struct usb_serial_port *) tty->driver_data;
+
+	dbg("%s - port %d", __FUNCTION__, port->number);
+
+	if (!port->open_count) {
+		dbg("%s - port not open", __FUNCTION__);
+		goto exit;
+	}
+
+	if (port->serial->type->tiocmget)
+		return port->serial->type->tiocmget(port, file);
+
+exit:
+	return -EINVAL;
+}
+
+static int serial_tiocmset (struct tty_struct *tty, struct file *file,
+			    unsigned int set, unsigned int clear)
+{
+	struct usb_serial_port *port = (struct usb_serial_port *) tty->driver_data;
+
+	dbg("%s - port %d", __FUNCTION__, port->number);
+
+	if (!port->open_count) {
+		dbg("%s - port not open", __FUNCTION__);
+		goto exit;
+	}
+
+	if (port->serial->type->tiocmset)
+		return port->serial->type->tiocmset(port, file, set, clear);
+
+exit:
+	return -EINVAL;
+}
+
+void usb_serial_port_softint(void *private)
+{
+	struct usb_serial_port *port = (struct usb_serial_port *)private;
+	struct tty_struct *tty;
+
+	dbg("%s - port %d", __FUNCTION__, port->number);
+	
+	if (!port)
+		return;
+
+	tty = port->tty;
+	if (!tty)
+		return;
+
+	tty_wakeup(tty);
+}
+
+static void port_release(struct device *dev)
+{
+	struct usb_serial_port *port = to_usb_serial_port(dev);
+
+	dbg ("%s - %s", __FUNCTION__, dev->bus_id);
+	usb_kill_urb(port->read_urb);
+	usb_free_urb(port->read_urb);
+	usb_kill_urb(port->write_urb);
+	usb_free_urb(port->write_urb);
+	usb_kill_urb(port->interrupt_in_urb);
+	usb_free_urb(port->interrupt_in_urb);
+	usb_kill_urb(port->interrupt_out_urb);
+	usb_free_urb(port->interrupt_out_urb);
+	kfree(port->bulk_in_buffer);
+	kfree(port->bulk_out_buffer);
+	kfree(port->interrupt_in_buffer);
+	kfree(port->interrupt_out_buffer);
+	kfree(port);
+}
+
+static struct usb_serial * create_serial (struct usb_device *dev, 
+					  struct usb_interface *interface,
+					  struct usb_serial_device_type *type)
+{
+	struct usb_serial *serial;
+
+	serial = kmalloc (sizeof (*serial), GFP_KERNEL);
+	if (!serial) {
+		dev_err(&dev->dev, "%s - out of memory\n", __FUNCTION__);
+		return NULL;
+	}
+	memset (serial, 0, sizeof(*serial));
+	serial->dev = usb_get_dev(dev);
+	serial->type = type;
+	serial->interface = interface;
+	kref_init(&serial->kref);
+
+	return serial;
+}
+
+static struct usb_serial_device_type *search_serial_device(struct usb_interface *iface)
+{
+	struct list_head *p;
+	const struct usb_device_id *id;
+	struct usb_serial_device_type *t;
+
+	/* List trough know devices and see if the usb id matches */
+	list_for_each(p, &usb_serial_driver_list) {
+		t = list_entry(p, struct usb_serial_device_type, driver_list);
+		id = usb_match_id(iface, t->id_table);
+		if (id != NULL) {
+			dbg("descriptor matches");
+			return t;
+		}
+	}
+
+	return NULL;
+}
+
+int usb_serial_probe(struct usb_interface *interface,
+			       const struct usb_device_id *id)
+{
+	struct usb_device *dev = interface_to_usbdev (interface);
+	struct usb_serial *serial = NULL;
+	struct usb_serial_port *port;
+	struct usb_host_interface *iface_desc;
+	struct usb_endpoint_descriptor *endpoint;
+	struct usb_endpoint_descriptor *interrupt_in_endpoint[MAX_NUM_PORTS];
+	struct usb_endpoint_descriptor *interrupt_out_endpoint[MAX_NUM_PORTS];
+	struct usb_endpoint_descriptor *bulk_in_endpoint[MAX_NUM_PORTS];
+	struct usb_endpoint_descriptor *bulk_out_endpoint[MAX_NUM_PORTS];
+	struct usb_serial_device_type *type = NULL;
+	int retval;
+	int minor;
+	int buffer_size;
+	int i;
+	int num_interrupt_in = 0;
+	int num_interrupt_out = 0;
+	int num_bulk_in = 0;
+	int num_bulk_out = 0;
+	int num_ports = 0;
+	int max_endpoints;
+
+	type = search_serial_device(interface);
+	if (!type) {
+		dbg("none matched");
+		return -ENODEV;
+	}
+
+	serial = create_serial (dev, interface, type);
+	if (!serial) {
+		dev_err(&interface->dev, "%s - out of memory\n", __FUNCTION__);
+		return -ENOMEM;
+	}
+
+	/* if this device type has a probe function, call it */
+	if (type->probe) {
+		const struct usb_device_id *id;
+
+		if (!try_module_get(type->owner)) {
+			dev_err(&interface->dev, "module get failed, exiting\n");
+			kfree (serial);
+			return -EIO;
+		}
+
+		id = usb_match_id(interface, type->id_table);
+		retval = type->probe(serial, id);
+		module_put(type->owner);
+
+		if (retval) {
+			dbg ("sub driver rejected device");
+			kfree (serial);
+			return retval;
+		}
+	}
+
+	/* descriptor matches, let's find the endpoints needed */
+	/* check out the endpoints */
+	iface_desc = interface->cur_altsetting;
+	for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
+		endpoint = &iface_desc->endpoint[i].desc;
+		
+		if ((endpoint->bEndpointAddress & 0x80) &&
+		    ((endpoint->bmAttributes & 3) == 0x02)) {
+			/* we found a bulk in endpoint */
+			dbg("found bulk in on endpoint %d", i);
+			bulk_in_endpoint[num_bulk_in] = endpoint;
+			++num_bulk_in;
+		}
+
+		if (((endpoint->bEndpointAddress & 0x80) == 0x00) &&
+		    ((endpoint->bmAttributes & 3) == 0x02)) {
+			/* we found a bulk out endpoint */
+			dbg("found bulk out on endpoint %d", i);
+			bulk_out_endpoint[num_bulk_out] = endpoint;
+			++num_bulk_out;
+		}
+		
+		if ((endpoint->bEndpointAddress & 0x80) &&
+		    ((endpoint->bmAttributes & 3) == 0x03)) {
+			/* we found a interrupt in endpoint */
+			dbg("found interrupt in on endpoint %d", i);
+			interrupt_in_endpoint[num_interrupt_in] = endpoint;
+			++num_interrupt_in;
+		}
+
+		if (((endpoint->bEndpointAddress & 0x80) == 0x00) &&
+		    ((endpoint->bmAttributes & 3) == 0x03)) {
+			/* we found an interrupt out endpoint */
+			dbg("found interrupt out on endpoint %d", i);
+			interrupt_out_endpoint[num_interrupt_out] = endpoint;
+			++num_interrupt_out;
+		}
+	}
+
+#if defined(CONFIG_USB_SERIAL_PL2303) || defined(CONFIG_USB_SERIAL_PL2303_MODULE)
+	/* BEGIN HORRIBLE HACK FOR PL2303 */ 
+	/* this is needed due to the looney way its endpoints are set up */
+	if (((le16_to_cpu(dev->descriptor.idVendor) == PL2303_VENDOR_ID) &&
+	     (le16_to_cpu(dev->descriptor.idProduct) == PL2303_PRODUCT_ID)) ||
+	    ((le16_to_cpu(dev->descriptor.idVendor) == ATEN_VENDOR_ID) &&
+	     (le16_to_cpu(dev->descriptor.idProduct) == ATEN_PRODUCT_ID))) {
+		if (interface != dev->actconfig->interface[0]) {
+			/* check out the endpoints of the other interface*/
+			iface_desc = dev->actconfig->interface[0]->cur_altsetting;
+			for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
+				endpoint = &iface_desc->endpoint[i].desc;
+				if ((endpoint->bEndpointAddress & 0x80) &&
+				    ((endpoint->bmAttributes & 3) == 0x03)) {
+					/* we found a interrupt in endpoint */
+					dbg("found interrupt in for Prolific device on separate interface");
+					interrupt_in_endpoint[num_interrupt_in] = endpoint;
+					++num_interrupt_in;
+				}
+			}
+		}
+
+		/* Now make sure the PL-2303 is configured correctly.
+		 * If not, give up now and hope this hack will work
+		 * properly during a later invocation of usb_serial_probe
+		 */
+		if (num_bulk_in == 0 || num_bulk_out == 0) {
+			dev_info(&interface->dev, "PL-2303 hack: descriptors matched but endpoints did not\n");
+			kfree (serial);
+			return -ENODEV;
+		}
+	}
+	/* END HORRIBLE HACK FOR PL2303 */
+#endif
+
+	/* found all that we need */
+	dev_info(&interface->dev, "%s converter detected\n", type->name);
+
+#ifdef CONFIG_USB_SERIAL_GENERIC
+	if (type == &usb_serial_generic_device) {
+		num_ports = num_bulk_out;
+		if (num_ports == 0) {
+			dev_err(&interface->dev, "Generic device with no bulk out, not allowed.\n");
+			kfree (serial);
+			return -EIO;
+		}
+	}
+#endif
+	if (!num_ports) {
+		/* if this device type has a calc_num_ports function, call it */
+		if (type->calc_num_ports) {
+			if (!try_module_get(type->owner)) {
+				dev_err(&interface->dev, "module get failed, exiting\n");
+				kfree (serial);
+				return -EIO;
+			}
+			num_ports = type->calc_num_ports (serial);
+			module_put(type->owner);
+		}
+		if (!num_ports)
+			num_ports = type->num_ports;
+	}
+
+	if (get_free_serial (serial, num_ports, &minor) == NULL) {
+		dev_err(&interface->dev, "No more free serial devices\n");
+		kfree (serial);
+		return -ENOMEM;
+	}
+
+	serial->minor = minor;
+	serial->num_ports = num_ports;
+	serial->num_bulk_in = num_bulk_in;
+	serial->num_bulk_out = num_bulk_out;
+	serial->num_interrupt_in = num_interrupt_in;
+	serial->num_interrupt_out = num_interrupt_out;
+
+	/* create our ports, we need as many as the max endpoints */
+	/* we don't use num_ports here cauz some devices have more endpoint pairs than ports */
+	max_endpoints = max(num_bulk_in, num_bulk_out);
+	max_endpoints = max(max_endpoints, num_interrupt_in);
+	max_endpoints = max(max_endpoints, num_interrupt_out);
+	max_endpoints = max(max_endpoints, (int)serial->num_ports);
+	serial->num_port_pointers = max_endpoints;
+	dbg("%s - setting up %d port structures for this device", __FUNCTION__, max_endpoints);
+	for (i = 0; i < max_endpoints; ++i) {
+		port = kmalloc(sizeof(struct usb_serial_port), GFP_KERNEL);
+		if (!port)
+			goto probe_error;
+		memset(port, 0x00, sizeof(struct usb_serial_port));
+		port->number = i + serial->minor;
+		port->serial = serial;
+		INIT_WORK(&port->work, usb_serial_port_softint, port);
+		serial->port[i] = port;
+	}
+
+	/* set up the endpoint information */
+	for (i = 0; i < num_bulk_in; ++i) {
+		endpoint = bulk_in_endpoint[i];
+		port = serial->port[i];
+		port->read_urb = usb_alloc_urb (0, GFP_KERNEL);
+		if (!port->read_urb) {
+			dev_err(&interface->dev, "No free urbs available\n");
+			goto probe_error;
+		}
+		buffer_size = le16_to_cpu(endpoint->wMaxPacketSize);
+		port->bulk_in_size = buffer_size;
+		port->bulk_in_endpointAddress = endpoint->bEndpointAddress;
+		port->bulk_in_buffer = kmalloc (buffer_size, GFP_KERNEL);
+		if (!port->bulk_in_buffer) {
+			dev_err(&interface->dev, "Couldn't allocate bulk_in_buffer\n");
+			goto probe_error;
+		}
+		usb_fill_bulk_urb (port->read_urb, dev,
+				   usb_rcvbulkpipe (dev,
+					   	    endpoint->bEndpointAddress),
+				   port->bulk_in_buffer, buffer_size,
+				   serial->type->read_bulk_callback,
+				   port);
+	}
+
+	for (i = 0; i < num_bulk_out; ++i) {
+		endpoint = bulk_out_endpoint[i];
+		port = serial->port[i];
+		port->write_urb = usb_alloc_urb(0, GFP_KERNEL);
+		if (!port->write_urb) {
+			dev_err(&interface->dev, "No free urbs available\n");
+			goto probe_error;
+		}
+		buffer_size = le16_to_cpu(endpoint->wMaxPacketSize);
+		port->bulk_out_size = buffer_size;
+		port->bulk_out_endpointAddress = endpoint->bEndpointAddress;
+		port->bulk_out_buffer = kmalloc (buffer_size, GFP_KERNEL);
+		if (!port->bulk_out_buffer) {
+			dev_err(&interface->dev, "Couldn't allocate bulk_out_buffer\n");
+			goto probe_error;
+		}
+		usb_fill_bulk_urb (port->write_urb, dev,
+				   usb_sndbulkpipe (dev,
+						    endpoint->bEndpointAddress),
+				   port->bulk_out_buffer, buffer_size, 
+				   serial->type->write_bulk_callback,
+				   port);
+	}
+
+	if (serial->type->read_int_callback) {
+		for (i = 0; i < num_interrupt_in; ++i) {
+			endpoint = interrupt_in_endpoint[i];
+			port = serial->port[i];
+			port->interrupt_in_urb = usb_alloc_urb(0, GFP_KERNEL);
+			if (!port->interrupt_in_urb) {
+				dev_err(&interface->dev, "No free urbs available\n");
+				goto probe_error;
+			}
+			buffer_size = le16_to_cpu(endpoint->wMaxPacketSize);
+			port->interrupt_in_endpointAddress = endpoint->bEndpointAddress;
+			port->interrupt_in_buffer = kmalloc (buffer_size, GFP_KERNEL);
+			if (!port->interrupt_in_buffer) {
+				dev_err(&interface->dev, "Couldn't allocate interrupt_in_buffer\n");
+				goto probe_error;
+			}
+			usb_fill_int_urb (port->interrupt_in_urb, dev, 
+					  usb_rcvintpipe (dev,
+							  endpoint->bEndpointAddress),
+					  port->interrupt_in_buffer, buffer_size, 
+					  serial->type->read_int_callback, port, 
+					  endpoint->bInterval);
+		}
+	} else if (num_interrupt_in) {
+		dbg("the device claims to support interrupt in transfers, but read_int_callback is not defined");
+	}
+	
+	if (serial->type->write_int_callback) {
+		for (i = 0; i < num_interrupt_out; ++i) {
+			endpoint = interrupt_out_endpoint[i];
+			port = serial->port[i];
+			port->interrupt_out_urb = usb_alloc_urb(0, GFP_KERNEL);
+			if (!port->interrupt_out_urb) {
+				dev_err(&interface->dev, "No free urbs available\n");
+				goto probe_error;
+			}
+			buffer_size = le16_to_cpu(endpoint->wMaxPacketSize);
+			port->interrupt_out_size = buffer_size;
+			port->interrupt_out_endpointAddress = endpoint->bEndpointAddress;
+			port->interrupt_out_buffer = kmalloc (buffer_size, GFP_KERNEL);
+			if (!port->interrupt_out_buffer) {
+				dev_err(&interface->dev, "Couldn't allocate interrupt_out_buffer\n");
+				goto probe_error;
+			}
+			usb_fill_int_urb (port->interrupt_out_urb, dev,
+					  usb_sndintpipe (dev,
+							  endpoint->bEndpointAddress),
+					  port->interrupt_out_buffer, buffer_size,
+					  serial->type->write_int_callback, port,
+					  endpoint->bInterval);
+		}
+	} else if (num_interrupt_out) {
+		dbg("the device claims to support interrupt out transfers, but write_int_callback is not defined");
+	}
+	
+	/* if this device type has an attach function, call it */
+	if (type->attach) {
+		if (!try_module_get(type->owner)) {
+			dev_err(&interface->dev, "module get failed, exiting\n");
+			goto probe_error;
+		}
+		retval = type->attach (serial);
+		module_put(type->owner);
+		if (retval < 0)
+			goto probe_error;
+		if (retval > 0) {
+			/* quietly accept this device, but don't bind to a serial port
+			 * as it's about to disappear */
+			goto exit;
+		}
+	}
+
+	/* register all of the individual ports with the driver core */
+	for (i = 0; i < num_ports; ++i) {
+		port = serial->port[i];
+		port->dev.parent = &interface->dev;
+		port->dev.driver = NULL;
+		port->dev.bus = &usb_serial_bus_type;
+		port->dev.release = &port_release;
+
+		snprintf (&port->dev.bus_id[0], sizeof(port->dev.bus_id), "ttyUSB%d", port->number);
+		dbg ("%s - registering %s", __FUNCTION__, port->dev.bus_id);
+		device_register (&port->dev);
+	}
+
+	usb_serial_console_init (debug, minor);
+
+exit:
+	/* success */
+	usb_set_intfdata (interface, serial);
+	return 0;
+
+probe_error:
+	for (i = 0; i < num_bulk_in; ++i) {
+		port = serial->port[i];
+		if (!port)
+			continue;
+		if (port->read_urb)
+			usb_free_urb (port->read_urb);
+		kfree(port->bulk_in_buffer);
+	}
+	for (i = 0; i < num_bulk_out; ++i) {
+		port = serial->port[i];
+		if (!port)
+			continue;
+		if (port->write_urb)
+			usb_free_urb (port->write_urb);
+		kfree(port->bulk_out_buffer);
+	}
+	for (i = 0; i < num_interrupt_in; ++i) {
+		port = serial->port[i];
+		if (!port)
+			continue;
+		if (port->interrupt_in_urb)
+			usb_free_urb (port->interrupt_in_urb);
+		kfree(port->interrupt_in_buffer);
+	}
+	for (i = 0; i < num_interrupt_out; ++i) {
+		port = serial->port[i];
+		if (!port)
+			continue;
+		if (port->interrupt_out_urb)
+			usb_free_urb (port->interrupt_out_urb);
+		kfree(port->interrupt_out_buffer);
+	}
+
+	/* return the minor range that this device had */
+	return_serial (serial);
+
+	/* free up any memory that we allocated */
+	for (i = 0; i < serial->num_port_pointers; ++i)
+		kfree(serial->port[i]);
+	kfree (serial);
+	return -EIO;
+}
+
+void usb_serial_disconnect(struct usb_interface *interface)
+{
+	int i;
+	struct usb_serial *serial = usb_get_intfdata (interface);
+	struct device *dev = &interface->dev;
+	struct usb_serial_port *port;
+
+	dbg ("%s", __FUNCTION__);
+
+	usb_set_intfdata (interface, NULL);
+	if (serial) {
+		for (i = 0; i < serial->num_ports; ++i) {
+			port = serial->port[i];
+			if (port && port->tty)
+				tty_hangup(port->tty);
+		}
+		/* let the last holder of this object 
+		 * cause it to be cleaned up */
+		kref_put(&serial->kref, destroy_serial);
+	}
+	dev_info(dev, "device disconnected\n");
+}
+
+static struct tty_operations serial_ops = {
+	.open =			serial_open,
+	.close =		serial_close,
+	.write =		serial_write,
+	.write_room =		serial_write_room,
+	.ioctl =		serial_ioctl,
+	.set_termios =		serial_set_termios,
+	.throttle =		serial_throttle,
+	.unthrottle =		serial_unthrottle,
+	.break_ctl =		serial_break,
+	.chars_in_buffer =	serial_chars_in_buffer,
+	.read_proc =		serial_read_proc,
+	.tiocmget =		serial_tiocmget,
+	.tiocmset =		serial_tiocmset,
+};
+
+struct tty_driver *usb_serial_tty_driver;
+
+static int __init usb_serial_init(void)
+{
+	int i;
+	int result;
+
+	usb_serial_tty_driver = alloc_tty_driver(SERIAL_TTY_MINORS);
+	if (!usb_serial_tty_driver)
+		return -ENOMEM;
+
+	/* Initialize our global data */
+	for (i = 0; i < SERIAL_TTY_MINORS; ++i) {
+		serial_table[i] = NULL;
+	}
+
+	result = bus_register(&usb_serial_bus_type);
+	if (result) {
+		err("%s - registering bus driver failed", __FUNCTION__);
+		goto exit_bus;
+	}
+
+	/* register the generic driver, if we should */
+	result = usb_serial_generic_register(debug);
+	if (result < 0) {
+		err("%s - registering generic driver failed", __FUNCTION__);
+		goto exit_generic;
+	}
+
+	usb_serial_tty_driver->owner = THIS_MODULE;
+	usb_serial_tty_driver->driver_name = "usbserial";
+	usb_serial_tty_driver->devfs_name = "usb/tts/";
+	usb_serial_tty_driver->name = 	"ttyUSB";
+	usb_serial_tty_driver->major = SERIAL_TTY_MAJOR;
+	usb_serial_tty_driver->minor_start = 0;
+	usb_serial_tty_driver->type = TTY_DRIVER_TYPE_SERIAL;
+	usb_serial_tty_driver->subtype = SERIAL_TYPE_NORMAL;
+	usb_serial_tty_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_NO_DEVFS;
+	usb_serial_tty_driver->init_termios = tty_std_termios;
+	usb_serial_tty_driver->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL;
+	tty_set_operations(usb_serial_tty_driver, &serial_ops);
+	result = tty_register_driver(usb_serial_tty_driver);
+	if (result) {
+		err("%s - tty_register_driver failed", __FUNCTION__);
+		goto exit_reg_driver;
+	}
+
+	/* register the USB driver */
+	result = usb_register(&usb_serial_driver);
+	if (result < 0) {
+		err("%s - usb_register failed", __FUNCTION__);
+		goto exit_tty;
+	}
+
+	info(DRIVER_DESC " " DRIVER_VERSION);
+
+	return result;
+
+exit_tty:
+	tty_unregister_driver(usb_serial_tty_driver);
+
+exit_reg_driver:
+	usb_serial_generic_deregister();
+
+exit_generic:
+	bus_unregister(&usb_serial_bus_type);
+
+exit_bus:
+	err ("%s - returning with error %d", __FUNCTION__, result);
+	put_tty_driver(usb_serial_tty_driver);
+	return result;
+}
+
+
+static void __exit usb_serial_exit(void)
+{
+	usb_serial_console_exit();
+
+	usb_serial_generic_deregister();
+
+	usb_deregister(&usb_serial_driver);
+	tty_unregister_driver(usb_serial_tty_driver);
+	put_tty_driver(usb_serial_tty_driver);
+	bus_unregister(&usb_serial_bus_type);
+}
+
+
+module_init(usb_serial_init);
+module_exit(usb_serial_exit);
+
+#define set_to_generic_if_null(type, function)				\
+	do {								\
+		if (!type->function) {					\
+			type->function = usb_serial_generic_##function;	\
+			dbg("Had to override the " #function		\
+				 " usb serial operation with the generic one.");\
+			}						\
+	} while (0)
+
+static void fixup_generic(struct usb_serial_device_type *device)
+{
+	set_to_generic_if_null(device, open);
+	set_to_generic_if_null(device, write);
+	set_to_generic_if_null(device, close);
+	set_to_generic_if_null(device, write_room);
+	set_to_generic_if_null(device, chars_in_buffer);
+	set_to_generic_if_null(device, read_bulk_callback);
+	set_to_generic_if_null(device, write_bulk_callback);
+	set_to_generic_if_null(device, shutdown);
+}
+
+int usb_serial_register(struct usb_serial_device_type *new_device)
+{
+	int retval;
+
+	fixup_generic(new_device);
+
+	/* Add this device to our list of devices */
+	list_add(&new_device->driver_list, &usb_serial_driver_list);
+
+	retval = usb_serial_bus_register(new_device);
+	if (retval) {
+		err("problem %d when registering driver %s", retval, new_device->name);
+		list_del(&new_device->driver_list);
+	}
+	else
+		info("USB Serial support registered for %s", new_device->name);
+
+	return retval;
+}
+
+
+void usb_serial_deregister(struct usb_serial_device_type *device)
+{
+	info("USB Serial deregistering driver %s", device->name);
+	list_del(&device->driver_list);
+	usb_serial_bus_deregister(device);
+}
+
+
+
+/* If the usb-serial core is built into the core, the usb-serial drivers
+   need these symbols to load properly as modules. */
+EXPORT_SYMBOL_GPL(usb_serial_register);
+EXPORT_SYMBOL_GPL(usb_serial_deregister);
+EXPORT_SYMBOL_GPL(usb_serial_probe);
+EXPORT_SYMBOL_GPL(usb_serial_disconnect);
+EXPORT_SYMBOL_GPL(usb_serial_port_softint);
+
+
+/* Module information */
+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 enabled or not");