Message-Id: <1192383445.8372.18.camel@dell1.softservecom.com>
Date:	Sun, 14 Oct 2007 20:37:25 +0300
From:	Vitaliy Ivanov <vitalivanov@...il.com>
To:	gregkh@...e.de, wtarreau@...a.kernel.org, vitalivanov@...il.com
Cc:	linux-usb-devel@...ts.sourceforge.net, linux-kernel@...r.kernel.org
Subject: [2.4 patch] Port of adutux driver from 2.6 kernel to 2.4.

Hello Willy, Greg and list,

I have ported adutux driver for ADU series device list from 2.6 to 2.4. 
More on devices:
http://www.ontrak.net/products.htm#Table%205

Once I needed to make ADU200 work under 2.4 enterprise kernel and wasn't able to do this.
My organization decided to use another device for our private purposes.

I was always interested in kernel hacking and thought it's a good point to start it from.
Just to add I'm not related to Ontrak in anyway. Also I'm not a Google person.
Did it just for fun.

A few technical notes:
- I was trying to leave as much as possible adutux driver code from 2.6 as it's in the 2.6 mainline for a long time and seems like it works OK there.
- Used one shot interrupt urbs that's why all intervals are 0.
- Reused 67 minor number from 2.6 kernel for this device.
- All 2.4 related changes are taken/reused from usb-skeleton.

Patch is based on the latest 2.4.35.3.

Performed a lot of tests but only under UHCI controller and ADU200 and all seems to be OK.

I would like someone to perform code review as it's my first attempt to the kernel programming. 
Any comments, propositions are welcome.

Signed-off-by: Vitaliy Ivanov <vitalivanov@...il.com>
Tested-by: Vitaliy Ivanov <vitalivanov@...il.com>

--

diff -uprN -X dontdiff KERNELS/linux-2.4.35.3/Documentation/Configure.help linux-2.4.35.3.build/Documentation/Configure.help
-- KERNELS/linux-2.4.35.3/Documentation/Configure.help	2007-09-24 01:02:58.000000000 +0300
+++ linux-2.4.35.3.build/Documentation/Configure.help	2007-10-14 19:19:06.000000000 +0300
@@ -16123,6 +16123,17 @@ CONFIG_USB_RIO500
   The module will be called rio500.o. If you want to compile it as
   a module, say M here and read <file:Documenatation/modules.txt>.
 
+Ontrak Control Systems ADU devices support
+CONFIG_USB_ADUTUX
+  Say Y here if you want to connect ADU 100/200 series devices to your
+  computer's USB port. 
+  Details at: <http://www.ontrak.net/products.htm#Table%205>
+
+  This code is also available as a module ( = code which can be
+  inserted in and removed from the running kernel whenever you want).
+  The module will be called adutux.o. If you want to compile it as
+  a module, say M here and read <file:Documenatation/modules.txt>.
+
 Auerswald device support
 CONFIG_USB_AUERSWALD
   Say Y here if you want to connect an Auerswald USB ISDN Device
diff -uprN -X dontdiff KERNELS/linux-2.4.35.3/drivers/usb/adutux.c linux-2.4.35.3.build/drivers/usb/adutux.c
-- KERNELS/linux-2.4.35.3/drivers/usb/adutux.c	1970-01-01 03:00:00.000000000 +0300
+++ linux-2.4.35.3.build/drivers/usb/adutux.c	2007-10-14 19:08:59.000000000 +0300
@@ -0,0 +1,1035 @@
+/*
+ * This is a 2.4.* kernel version of adutux driver that
+ * was originaly created by John Homppi for 2.6.* kernels.
+ * 
+ * Copyright (c) 2007 Vitaliy Ivanov (vitalivanov@...il.com)
+ *
+ * Original note:
+ *
+ * adutux - driver for ADU devices from Ontrak Control Systems
+ * This is an experimental driver. Use at your own risk.
+ * This driver is not supported by Ontrak Control Systems.
+ *
+ * Copyright (c) 2003 John Homppi (SCO, leave this notice here)
+ *
+ * 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.
+ *
+ * derived from the Lego USB Tower driver 0.56:
+ * Copyright (c) 2003 David Glance <davidgsf@...rceforge.net>
+ *               2001 Juergen Stuber <stuber@...ia.fr>
+ * that was derived from USB Skeleton driver - 0.5
+ * Copyright (c) 2001 Greg Kroah-Hartman (greg@...ah.com)
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/devfs_fs_kernel.h>
+#include <linux/usb.h>
+#include <asm/uaccess.h>
+
+#ifdef CONFIG_USB_DEBUG
+static int debug = 5;
+#else
+static int debug = 1;
+#endif
+
+/* Use our own dbg macro */
+#undef dbg
+#define dbg(lvl, format, arg...) 					\
+do { 									\
+	if (debug >= lvl)						\
+		printk(KERN_DEBUG __FILE__ " : " format " \n", ## arg);	\
+} while (0)
+
+
+/* Version Information */
+#define DRIVER_VERSION "v0.0.1"
+#define DRIVER_AUTHOR "Vitaliy Ivanov"
+#define DRIVER_DESC "adutux (see www.ontrak.net)"
+
+/* Module parameters */
+module_param(debug, int, S_IRUGO | S_IWUSR);
+MODULE_PARM_DESC(debug, "Debug enabled or not");
+
+/* Define these values to match your device */
+#define ADU_VENDOR_ID 0x0a07
+#define ADU_PRODUCT_ID 0x0064
+
+/* table of devices that work with this driver */
+static struct usb_device_id device_table [] = {
+	{ USB_DEVICE(ADU_VENDOR_ID, ADU_PRODUCT_ID) },		/* ADU100 */
+	{ USB_DEVICE(ADU_VENDOR_ID, ADU_PRODUCT_ID+20) },	/* ADU120 */
+	{ USB_DEVICE(ADU_VENDOR_ID, ADU_PRODUCT_ID+30) },	/* ADU130 */
+	{ USB_DEVICE(ADU_VENDOR_ID, ADU_PRODUCT_ID+100) },	/* ADU200 */
+	{ USB_DEVICE(ADU_VENDOR_ID, ADU_PRODUCT_ID+108) },	/* ADU208 */
+	{ USB_DEVICE(ADU_VENDOR_ID, ADU_PRODUCT_ID+118) },	/* ADU218 */
+	{ }/* Terminating entry */
+};
+
+MODULE_DEVICE_TABLE(usb, device_table);
+
+#define ADU_MINOR_BASE	67
+
+/* we can have up to this number of device plugged in at once */
+#define MAX_DEVICES	16
+
+#define COMMAND_TIMEOUT	(2*HZ)	/* 60 second timeout for a command */
+
+/* Structure to hold all of our device specific stuff */
+struct adu_device {
+	struct semaphore	sem;	/* locks this structure */
+	struct usb_device*	udev;	/* save off the usb device pointer */
+	//struct usb_interface*	interface;
+	devfs_handle_t		devfs;	/* devfs device node */
+	unsigned char		minor;	/* the starting minor number for this device */
+
+	int			open_count;	/* number of times this port has been opened */
+
+	char*			read_buffer_primary;
+	int			read_buffer_length;
+	char*			read_buffer_secondary;
+	int			secondary_head;
+	int			secondary_tail;
+	spinlock_t		buflock;
+
+	wait_queue_head_t	read_wait;
+	wait_queue_head_t	write_wait;
+
+	char*			interrupt_in_buffer;
+	struct usb_endpoint_descriptor*	interrupt_in_endpoint;
+	struct urb*		interrupt_in_urb;
+	int			read_urb_finished;
+
+	char*			interrupt_out_buffer;
+	struct usb_endpoint_descriptor*	interrupt_out_endpoint;
+	struct urb*		interrupt_out_urb;
+};
+
+/* the global usb devfs handle */
+extern devfs_handle_t	usb_devfs_handle;
+
+/* local function prototypes */
+static ssize_t adu_read(struct file *file, char *buffer, size_t count, loff_t *ppos);
+static ssize_t adu_write(struct file *file, const char *buffer, size_t count, loff_t *ppos);
+static void adu_delete(struct adu_device *dev);
+static int adu_open(struct inode *inode, struct file *file);
+static int adu_release(struct inode *inode, struct file *file);
+static int adu_release_internal(struct adu_device *dev);
+static void adu_interrupt_in_callback(struct urb *urb);
+static void adu_interrupt_out_callback(struct urb *urb);
+static void *adu_probe(struct usb_device *dev, unsigned int ifnum, const struct usb_device_id *id);
+static void adu_disconnect(struct usb_device *dev, void *ptr);
+
+/* array of pointers to our devices that are currently connected */
+static struct adu_device	*minor_table[MAX_DEVICES];
+
+/* lock to protect the minor_table structure */
+static DECLARE_MUTEX(minor_table_mutex);
+
+/* file operations needed when we register this driver */
+static struct file_operations adu_fops = {
+	owner:		THIS_MODULE,
+	read:		adu_read,
+	write:		adu_write,
+	open:		adu_open,
+	release:	adu_release,
+};
+
+/* usb specific object needed to register this driver with the usb subsystem */
+static struct usb_driver adu_driver = {
+	name:		"adutux",
+	probe:		adu_probe,
+	disconnect:	adu_disconnect,
+	fops:		&adu_fops,
+	minor:		ADU_MINOR_BASE,
+	id_table:	device_table,
+};
+
+/**
+ *  adu_debug_data
+ */
+static void adu_debug_data(int level, const char *function, int size,
+			   const unsigned char *data)
+{
+	int i;
+
+	if (debug < level)
+		return;
+
+	printk(KERN_DEBUG __FILE__": %s - length = %d, data = ",
+	       function, size);
+	for (i = 0; i < size; ++i)
+		printk("%.2x ", data[i]);
+	printk("\n");
+}
+
+/**
+ * adu_abort_transfers
+ *      aborts transfers and frees associated data structures
+ */
+static void adu_abort_transfers(struct adu_device *dev)
+{
+	dbg(2," %s : enter", __FUNCTION__);
+
+	if (dev == NULL) {
+		dbg(1," %s : dev is null", __FUNCTION__);
+		goto exit;
+	}
+
+	if (dev->udev == NULL) {
+		dbg(1," %s : udev is null", __FUNCTION__);
+		goto exit;
+	}
+
+	/* shutdown transfer */
+	usb_unlink_urb(dev->interrupt_in_urb);
+	usb_unlink_urb(dev->interrupt_out_urb);
+
+exit:
+	dbg(2," %s : leave", __FUNCTION__);
+}
+
+/**
+ *  adu_delete
+ */
+static void adu_delete(struct adu_device *dev)
+{
+	dbg(2, "%s enter", __FUNCTION__);
+
+	minor_table[dev->minor] = NULL;
+	adu_abort_transfers(dev);
+
+	/* free data structures */
+	if (dev->interrupt_in_urb != NULL) {
+		usb_free_urb(dev->interrupt_in_urb);
+	}
+	if (dev->interrupt_out_urb != NULL) {
+		usb_free_urb(dev->interrupt_out_urb);
+	}
+	if (dev->read_buffer_primary != NULL) {
+		kfree(dev->read_buffer_primary);
+	}
+	if (dev->read_buffer_secondary != NULL) {
+		kfree(dev->read_buffer_secondary);
+	}
+	if (dev->interrupt_in_buffer != NULL) {
+		kfree(dev->interrupt_in_buffer);
+	}
+	if (dev->interrupt_out_buffer != NULL) {
+		kfree(dev->interrupt_out_buffer);
+	}
+	kfree(dev);
+
+	dbg(2, "%s : leave", __FUNCTION__);
+}
+
+/**
+ *  adu_interrupt_in_callback
+ */
+static void adu_interrupt_in_callback(struct urb *urb)
+{
+	struct adu_device *dev = urb->context;
+
+	dbg(4," %s : enter, status %d", __FUNCTION__, urb->status);
+	adu_debug_data(5, __FUNCTION__, urb->actual_length,
+		       urb->transfer_buffer);
+
+	spin_lock(&dev->buflock);
+
+	if (urb->status != 0) {
+		if ((urb->status != -ENOENT) && (urb->status != -ECONNRESET) &&
+			(urb->status != -ESHUTDOWN)) {
+			dbg(1," %s : nonzero status received: %d",
+			    __FUNCTION__, urb->status);
+		}
+		goto exit;
+	}
+
+	if (urb->actual_length > 0 && dev->interrupt_in_buffer[0] != 0x00) {
+		if (dev->read_buffer_length <
+		    (4 * le16_to_cpu(dev->interrupt_in_endpoint->wMaxPacketSize)) -
+		     (urb->actual_length)) {
+			memcpy (dev->read_buffer_primary +
+				dev->read_buffer_length,
+				dev->interrupt_in_buffer, urb->actual_length);
+
+			dev->read_buffer_length += urb->actual_length;
+			dbg(2," %s reading  %d ", __FUNCTION__,
+			    urb->actual_length);
+		} else {
+			dbg(1," %s : read_buffer overflow", __FUNCTION__);
+		}
+	}
+
+exit:
+	dev->read_urb_finished = 1;
+	spin_unlock(&dev->buflock);
+	/* always wake up so we recover from errors */
+	wake_up_interruptible(&dev->read_wait);
+	adu_debug_data(5, __FUNCTION__, urb->actual_length,
+		       urb->transfer_buffer);
+	dbg(4," %s : leave, status %d", __FUNCTION__, urb->status);
+}
+
+/**
+ *  adu_interrupt_out_callback
+ */
+static void adu_interrupt_out_callback(struct urb *urb)
+{
+	struct adu_device *dev = urb->context;
+
+	dbg(4," %s : enter, status %d", __FUNCTION__, urb->status);
+	adu_debug_data(5,__FUNCTION__, urb->actual_length, urb->transfer_buffer);
+
+	if (urb->status != 0) {
+		if ((urb->status != -ENOENT) &&
+		    (urb->status != -ECONNRESET)) {
+			dbg(1, " %s :nonzero status received: %d",
+			    __FUNCTION__, urb->status);
+		}
+		goto exit;
+	}
+
+	wake_up_interruptible(&dev->write_wait);
+exit:
+
+	adu_debug_data(5, __FUNCTION__, urb->actual_length,
+		       urb->transfer_buffer);
+	dbg(4," %s : leave, status %d", __FUNCTION__, urb->status);
+}
+
+/**
+ *  adu_open
+ */
+static int adu_open(struct inode *inode, struct file *file)
+{
+	struct adu_device *dev = NULL;
+	int subminor;
+	int retval = 0;
+
+	dbg(2,"%s : enter", __FUNCTION__);
+
+	subminor = MINOR (inode->i_rdev) - ADU_MINOR_BASE;
+	if ((subminor < 0) ||
+	    (subminor >= MAX_DEVICES)) {
+		retval = -ENODEV;
+		goto exit;
+	}
+
+	/* lock our minor table and get our local data for this minor */
+	down (&minor_table_mutex);
+	dev = minor_table[subminor];
+	if (dev == NULL) {
+		retval = -ENODEV;
+		goto unlock_minor_table_exit;
+	}
+
+	/* lock this device */
+	down (&dev->sem);
+
+	/* increment our usage count for the device */
+	++dev->open_count;
+	dbg(2,"%s : open count %d", __FUNCTION__, dev->open_count);
+
+	/* check that nobody else is using the device */
+	/* NOTE: the cleanup code will decrement the count to 1 */
+	if (dev->open_count > 1) {
+		retval = -EBUSY;
+		goto error;
+	}
+
+	/* save device in the file's private structure */
+	file->private_data = dev;
+
+	/* initialize in direction */
+	dev->read_buffer_length = 0;
+
+	/* fixup first read by having urb waiting for it */
+	FILL_INT_URB(dev->interrupt_in_urb,
+		     dev->udev,
+		     usb_rcvintpipe(dev->udev, dev->interrupt_in_endpoint->bEndpointAddress),
+		     dev->interrupt_in_buffer,
+		     le16_to_cpu(dev->interrupt_in_endpoint->wMaxPacketSize),
+		     adu_interrupt_in_callback,
+		     dev,
+		     0);
+
+	/* dev->interrupt_in_urb->transfer_flags |= URB_ASYNC_UNLINK; */
+	dev->read_urb_finished = 0;
+	retval = usb_submit_urb(dev->interrupt_in_urb);
+	if (retval != 0) {
+		err("Couldn't submit interrupt_in_urb");
+		goto error;
+	}
+	/* end of fixup for first read */
+
+	goto unlock_exit;
+
+error:
+	adu_release_internal(dev);
+
+unlock_exit:
+	/* unlock this device */
+	up(&dev->sem);
+
+unlock_minor_table_exit:
+	/* unlock the minor table */
+	up(&minor_table_mutex);
+
+exit:
+	dbg(2, " %s : leave, return value %d", __FUNCTION__, retval);
+
+	return retval;
+}
+
+/**
+ *	adu_release_internal
+ */
+static int adu_release_internal(struct adu_device *dev)
+{
+	int retval = 0;
+
+	dbg(2," %s : enter", __FUNCTION__);
+
+	if (dev->udev == NULL) {
+		/* the device was unplugged before the file was released */
+		adu_delete(dev);
+		goto exit;
+	}
+
+	/* decrement our usage count for the device */
+	--dev->open_count;
+	dbg(2," %s : open count %d", __FUNCTION__, dev->open_count);
+	if (dev->open_count <= 0) {
+		adu_abort_transfers(dev);
+		dev->open_count = 0;
+	}
+
+exit:
+	dbg(2," %s : leave", __FUNCTION__);
+	return retval;
+}
+
+/**
+ *	adu_release
+ */
+static int adu_release(struct inode *inode, struct file *file)
+{
+	struct adu_device *dev = NULL;
+	int retval = 0;
+
+	dbg(2," %s : enter", __FUNCTION__);
+
+	if (file == NULL) {
+		dbg(1," %s : file is NULL", __FUNCTION__);
+		retval = -ENODEV;
+		goto exit;
+	}
+
+	dev = file->private_data;
+
+	if (dev == NULL) {
+		dbg(1," %s : object is NULL", __FUNCTION__);
+		retval = -ENODEV;
+		goto exit;
+	}
+
+	/* lock our minor table */
+	down(&minor_table_mutex);
+
+	/* lock our device */
+	down(&dev->sem);
+
+	if (dev->open_count <= 0) {
+		dbg(1," %s : device not opened", __FUNCTION__);
+		up(&dev->sem);
+		up(&minor_table_mutex);
+		retval = -ENODEV;
+		goto exit;
+	}
+
+	/* do the work */
+	retval = adu_release_internal(dev);
+
+	/* unlocking device */
+	up(&dev->sem);
+	up(&minor_table_mutex);
+
+exit:
+	dbg(2," %s : leave, return value %d", __FUNCTION__, retval);
+	return retval;
+}
+
+/**
+ *	adu_read
+ */
+static ssize_t adu_read(struct file *file, __user char *buffer, size_t count,
+			loff_t *ppos)
+{
+	struct adu_device *dev;
+	size_t bytes_read = 0;
+	size_t bytes_to_read = count;
+	int i;
+	int retval = 0;
+	int timeout = 0;
+	int should_submit = 0;
+	unsigned long flags;
+	DECLARE_WAITQUEUE(wait, current);
+
+	dbg(2," %s : enter, count = %Zd, file=%p", __FUNCTION__, count, file);
+
+	dev = file->private_data;
+	dbg(2," %s : dev=%p", __FUNCTION__, dev);
+	/* lock this object */
+	if (down_interruptible(&dev->sem))
+		return -ERESTARTSYS;
+
+	/* verify that the device wasn't unplugged */
+	if (dev->udev == NULL) {
+		retval = -ENODEV;
+		err("No device or device unplugged %d", retval);
+		goto exit;
+	}
+
+	/* verify that some data was requested */
+	if (count == 0) {
+		dbg(1," %s : read request of 0 bytes", __FUNCTION__);
+		goto exit;
+	}
+
+	timeout = COMMAND_TIMEOUT;
+	dbg(2," %s : about to start looping", __FUNCTION__);
+	while (bytes_to_read) {
+		int data_in_secondary = dev->secondary_tail - dev->secondary_head;
+		dbg(2," %s : while, data_in_secondary=%d, status=%d",
+		    __FUNCTION__, data_in_secondary,
+		    dev->interrupt_in_urb->status);
+
+		if (data_in_secondary) {
+			/* drain secondary buffer */
+			int amount = bytes_to_read < data_in_secondary ? bytes_to_read : data_in_secondary;
+			i = copy_to_user(buffer, dev->read_buffer_secondary+dev->secondary_head, amount);
+			if (i < 0) {
+				retval = -EFAULT;
+				goto exit;
+			}
+			dev->secondary_head += (amount - i);
+			bytes_read += (amount - i);
+			bytes_to_read -= (amount - i);
+			if (i) {
+				retval = bytes_read ? bytes_read : -EFAULT;
+				goto exit;
+			}
+		} else {
+			/* we check the primary buffer */
+			spin_lock_irqsave (&dev->buflock, flags);
+			if (dev->read_buffer_length) {
+				/* we secure access to the primary */
+				char *tmp;
+				dbg(2," %s : swap, read_buffer_length = %d",
+				    __FUNCTION__, dev->read_buffer_length);
+				tmp = dev->read_buffer_secondary;
+				dev->read_buffer_secondary = dev->read_buffer_primary;
+				dev->read_buffer_primary = tmp;
+				dev->secondary_head = 0;
+				dev->secondary_tail = dev->read_buffer_length;
+				dev->read_buffer_length = 0;
+				spin_unlock_irqrestore(&dev->buflock, flags);
+				/* we have a free buffer so use it */
+				should_submit = 1;
+			} else {
+				/* even the primary was empty - we may need to do IO */
+				if (dev->interrupt_in_urb->status == -EINPROGRESS) {
+					/* somebody is doing IO */
+					spin_unlock_irqrestore(&dev->buflock, flags);
+					dbg(2," %s : submitted already", __FUNCTION__);
+				} else {
+					/* we must initiate input */
+					dbg(2," %s : initiate input", __FUNCTION__);
+					dev->read_urb_finished = 0;
+
+					FILL_INT_URB(dev->interrupt_in_urb,
+						     dev->udev,
+						     usb_rcvintpipe(dev->udev, dev->interrupt_in_endpoint->bEndpointAddress),
+						     dev->interrupt_in_buffer,
+						     le16_to_cpu(dev->interrupt_in_endpoint->wMaxPacketSize),
+						     adu_interrupt_in_callback,
+						     dev,
+						     0);
+
+					retval = usb_submit_urb(dev->interrupt_in_urb);
+					if (!retval) {
+						spin_unlock_irqrestore(&dev->buflock, flags);
+						dbg(2," %s : submitted OK", __FUNCTION__);
+					} else {
+						if (retval == -ENOMEM) {
+							retval = bytes_read ? bytes_read : -ENOMEM;
+						}
+						spin_unlock_irqrestore(&dev->buflock, flags);
+						dbg(2," %s : submit failed", __FUNCTION__);
+						goto exit;
+					}
+				}
+
+				/* we wait for I/O to complete */
+				set_current_state(TASK_INTERRUPTIBLE);
+				add_wait_queue(&dev->read_wait, &wait);
+				if (!dev->read_urb_finished)
+					timeout = schedule_timeout(COMMAND_TIMEOUT);
+				else
+					set_current_state(TASK_RUNNING);
+				remove_wait_queue(&dev->read_wait, &wait);
+
+				if (timeout <= 0) {
+					dbg(2," %s : timeout", __FUNCTION__);
+					retval = bytes_read ? bytes_read : -ETIMEDOUT;
+					goto exit;
+				}
+
+				if (signal_pending(current)) {
+					dbg(2," %s : signal pending", __FUNCTION__);
+					retval = bytes_read ? bytes_read : -EINTR;
+					goto exit;
+				}
+			}
+		}
+	}
+
+	retval = bytes_read;
+	/* if the primary buffer is empty then use it */
+	if (should_submit && !dev->interrupt_in_urb->status==-EINPROGRESS) {
+		FILL_INT_URB(dev->interrupt_in_urb,
+			     dev->udev,
+			     usb_rcvintpipe(dev->udev,dev->interrupt_in_endpoint->bEndpointAddress),
+			     dev->interrupt_in_buffer,
+			     le16_to_cpu(dev->interrupt_in_endpoint->wMaxPacketSize),
+			     adu_interrupt_in_callback,
+			     dev,
+			     0);
+
+		/* dev->interrupt_in_urb->transfer_flags |= URB_ASYNC_UNLINK; */
+		dev->read_urb_finished = 0;
+		usb_submit_urb(dev->interrupt_in_urb);
+		/* we ignore failure */
+	}
+
+exit:
+	/* unlock the device */
+	up(&dev->sem);
+
+	dbg(2," %s : leave, return value %d", __FUNCTION__, retval);
+	return retval;
+}
+
+/**
+ *	adu_write
+ */
+static ssize_t adu_write(struct file *file, const __user char *buffer,
+			 size_t count, loff_t *ppos)
+{
+	struct adu_device *dev;
+	size_t bytes_written = 0;
+	size_t bytes_to_write;
+	size_t buffer_size;
+	int retval = 0;
+	int timeout = 0;
+
+	dbg(2," %s : enter, count = %Zd", __FUNCTION__, count);
+
+	dev = file->private_data;
+
+	/* lock this object */
+	down_interruptible(&dev->sem);
+
+	/* verify that the device wasn't unplugged */
+	if (dev->udev == NULL) {
+		retval = -ENODEV;
+		err("No device or device unplugged %d", retval);
+		goto exit;
+	}
+
+	/* verify that we actually have some data to write */
+	if (count == 0) {
+		dbg(1," %s : write request of 0 bytes", __FUNCTION__);
+		goto exit;
+	}
+
+
+	while (count > 0) {
+		if (dev->interrupt_out_urb->status == -EINPROGRESS) {
+			timeout = COMMAND_TIMEOUT;
+
+			while (timeout > 0) {
+				if (signal_pending(current)) {
+				dbg(1," %s : interrupted", __FUNCTION__);
+				retval = -EINTR;
+				goto exit;
+			}
+			up(&dev->sem);
+			timeout = interruptible_sleep_on_timeout(&dev->write_wait, timeout);
+			down_interruptible(&dev->sem);
+			if (timeout > 0) {
+				break;
+			}
+			dbg(1," %s : interrupted timeout: %d", __FUNCTION__, timeout);
+		}
+
+
+		dbg(1," %s : final timeout: %d", __FUNCTION__, timeout);
+
+		if (timeout == 0) {
+			dbg(1, "%s - command timed out.", __FUNCTION__);
+			retval = -ETIMEDOUT;
+			goto exit;
+		}
+
+		dbg(4," %s : in progress, count = %Zd", __FUNCTION__, count);
+
+		} else {
+			dbg(4," %s : sending, count = %Zd", __FUNCTION__, count);
+
+			/* write the data into interrupt_out_buffer from userspace */
+			buffer_size = le16_to_cpu(dev->interrupt_out_endpoint->wMaxPacketSize);
+			bytes_to_write = count > buffer_size ? buffer_size : count;
+			dbg(4," %s : buffer_size = %Zd, count = %Zd, bytes_to_write = %Zd",
+			    __FUNCTION__, buffer_size, count, bytes_to_write);
+
+			if (copy_from_user(dev->interrupt_out_buffer, buffer, bytes_to_write) != 0) {
+				retval = -EFAULT;
+				goto exit;
+			}
+
+			/* send off the urb */
+			FILL_INT_URB(
+				     dev->interrupt_out_urb,
+				     dev->udev,
+				     usb_sndintpipe(dev->udev, dev->interrupt_out_endpoint->bEndpointAddress),
+				     dev->interrupt_out_buffer,
+				     bytes_to_write,
+				     adu_interrupt_out_callback,
+				     dev,
+				     0);
+
+			/* dev->interrupt_in_urb->transfer_flags |= URB_ASYNC_UNLINK; */
+			dev->interrupt_out_urb->actual_length = bytes_to_write;
+			retval = usb_submit_urb(dev->interrupt_out_urb);
+			if (retval < 0) {
+				err("Couldn't submit interrupt_out_urb %d", retval);
+				goto exit;
+			}
+
+			buffer += bytes_to_write;
+			count -= bytes_to_write;
+
+			bytes_written += bytes_to_write;
+		}
+	}
+
+	retval = bytes_written;
+
+exit:
+	/* unlock the device */
+	up(&dev->sem);
+
+	dbg(2," %s : leave, return value %d", __FUNCTION__, retval);
+
+	return retval;
+}
+
+/**
+ * adu_probe
+ *
+ * Called by the usb core when a new device is connected that it thinks
+ * this driver might be interested in.
+ */
+static void *adu_probe(struct usb_device *udev, 
+		       unsigned int ifnum, const struct usb_device_id *id)
+{
+	struct adu_device *dev = NULL;
+	struct usb_interface *interface;
+	struct usb_interface_descriptor *iface_desc;
+	struct usb_endpoint_descriptor *endpoint;
+	int minor;
+	int in_end_size;
+	int out_end_size;
+	int i;
+	char name[10];
+	void *retval = NULL;
+
+	dbg(2, " %s : enter", __FUNCTION__);
+
+	if (udev == NULL) {
+		info ("udev is NULL.");
+		goto exit;
+	}
+
+	if (ifnum != 0) {
+		info ("Strange interface number %d.", ifnum);
+		goto exit;
+	}
+
+	/* select a "subminor" number (part of a minor number) */
+	down (&minor_table_mutex);
+	for (minor = 0; minor < MAX_DEVICES; ++minor) {
+		if (minor_table[minor] == NULL)
+			break;
+	}
+	if (minor >= MAX_DEVICES) {
+		info ("Too many devices plugged in, can not handle this device.");
+		goto unlock_minor_exit;
+	}
+
+	/* allocate memory for our device state and intialize it */
+	dev = kmalloc(sizeof(struct adu_device), GFP_KERNEL);
+	if (dev == NULL) {
+		err ("Out of memory");
+		goto unlock_minor_exit;
+	}
+	memset (dev, 0x00, sizeof (*dev));
+
+	init_MUTEX(&dev->sem);
+	spin_lock_init(&dev->buflock);
+	down(&dev->sem);
+	dev->udev = udev;
+
+	interface = &dev->udev->actconfig->interface[0];
+	iface_desc = &interface->altsetting[0];
+
+	//dev->interface = interface;
+	dev->minor = minor;
+	dev->open_count = 0;
+
+	dev->read_buffer_primary = NULL;
+	dev->read_buffer_secondary = NULL;
+	dev->read_buffer_length = 0;
+
+	dev->secondary_head = 0;
+	dev->secondary_tail = 0;
+
+	init_waitqueue_head(&dev->read_wait);
+	init_waitqueue_head(&dev->write_wait);
+
+	dev->interrupt_in_buffer = NULL;
+	dev->interrupt_in_endpoint = NULL;
+	dev->interrupt_in_urb = NULL;
+
+	dev->interrupt_out_buffer = NULL;
+	dev->interrupt_out_endpoint = NULL;
+	dev->interrupt_out_urb = NULL;
+
+	dev->read_urb_finished = 0;
+
+	/* set up the endpoint information */
+	for (i = 0; i < iface_desc->bNumEndpoints; ++i) {
+		endpoint = &iface_desc->endpoint[i];
+
+		/** 
+		 * Check if the endpoint has IN direction
+		 * and check if the endpoint has interrupt transfer type
+		 */
+		if (((endpoint->bEndpointAddress & USB_ENDPOINT_DIR_MASK) == USB_DIR_IN) &&
+		    ((endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) == USB_ENDPOINT_XFER_INT)) {
+			/* we found an interrupt in endpoint */
+			dev->interrupt_in_endpoint = endpoint;
+		}
+
+		/** 
+		 * Check if the endpoint has OUT direction
+		 * and check if the endpoint has interrupt transfer type
+		 */
+		if (((endpoint->bEndpointAddress & USB_ENDPOINT_DIR_MASK) == USB_DIR_OUT) &&
+		    ((endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) == USB_ENDPOINT_XFER_INT)) {
+			/* we found an interrupt out endpoint */
+			dev->interrupt_out_endpoint = endpoint;
+		}
+	}
+
+	if(dev->interrupt_in_endpoint == NULL) {
+		err("interrupt in endpoint not found");
+		goto error;
+	}
+	if (dev->interrupt_out_endpoint == NULL) {
+		err("interrupt out endpoint not found");
+		goto error;
+	}
+
+	in_end_size = le16_to_cpu(dev->interrupt_in_endpoint->wMaxPacketSize);
+	out_end_size = le16_to_cpu(dev->interrupt_out_endpoint->wMaxPacketSize);
+
+	dev->read_buffer_primary = kmalloc((4 * in_end_size), GFP_KERNEL);
+	if (!dev->read_buffer_primary) {
+		err("Couldn't allocate read_buffer_primary");
+		goto error;
+	}
+
+	/* debug code prime the buffer */
+	memset(dev->read_buffer_primary, 'a', in_end_size);
+	memset(dev->read_buffer_primary + in_end_size, 'b', in_end_size);
+	memset(dev->read_buffer_primary + (2 * in_end_size), 'c', in_end_size);
+	memset(dev->read_buffer_primary + (3 * in_end_size), 'd', in_end_size);
+
+	dev->read_buffer_secondary = kmalloc((4 * in_end_size), GFP_KERNEL);
+	if (!dev->read_buffer_secondary) {
+		err("Couldn't allocate read_buffer_secondary");
+		goto error;
+	}
+
+	/* debug code prime the buffer */
+	memset(dev->read_buffer_secondary, 'e', in_end_size);
+	memset(dev->read_buffer_secondary + in_end_size, 'f', in_end_size);
+	memset(dev->read_buffer_secondary + (2 * in_end_size), 'g', in_end_size);
+	memset(dev->read_buffer_secondary + (3 * in_end_size), 'h', in_end_size);
+
+	dev->interrupt_in_buffer = kmalloc(in_end_size, GFP_KERNEL);
+	if (!dev->interrupt_in_buffer) {
+		err("Couldn't allocate interrupt_in_buffer");
+		goto error;
+	}
+
+	/* debug code prime the buffer */
+	memset(dev->interrupt_in_buffer, 'i', in_end_size);
+
+	dev->interrupt_in_urb = usb_alloc_urb(0);
+	if (!dev->interrupt_in_urb) {
+		err("Couldn't allocate interrupt_in_urb");
+		goto error;
+	}
+	dev->interrupt_out_buffer = kmalloc(out_end_size, GFP_KERNEL);
+	if (!dev->interrupt_out_buffer) {
+		err("Couldn't allocate interrupt_out_buffer");
+		goto error;
+	}
+	dev->interrupt_out_urb = usb_alloc_urb(0);
+	if (!dev->interrupt_out_urb) {
+		err("Couldn't allocate interrupt_out_urb");
+		goto error;
+	}
+
+	/* put dev in interface->private_data for disconnect */
+	udev->actconfig->interface[0].private_data = dev;
+
+	/* publish it */
+	minor_table[minor] = dev;
+
+	/* initialize the devfs node for this device and register it */
+	sprintf(name, "adutux%d", dev->minor);
+
+	dev->devfs = devfs_register(usb_devfs_handle, name,
+				    DEVFS_FL_DEFAULT, USB_MAJOR,
+				    ADU_MINOR_BASE + dev->minor,
+				    S_IFCHR | S_IRUSR | S_IWUSR | 
+				    S_IRGRP | S_IWGRP | S_IROTH, 
+				    &adu_fops, NULL);
+
+	/* let the user know what node this device is now attached to */
+	info ("ADU%d now attached to /dev/usb/adutux%d", udev->descriptor.idProduct, dev->minor);
+
+	retval = dev;
+	/* unlock device */
+	up(&dev->sem);
+	goto unlock_minor_exit;
+
+error:
+	/* unlock device */
+	up(&dev->sem);
+	adu_delete(dev);
+	dev = NULL;
+
+unlock_minor_exit:
+	up(&minor_table_mutex);
+
+exit:
+	dbg(2," %s : leave, return value 0x%.8lx (dev)", __FUNCTION__, (dev)?(long)dev:0);
+
+	return retval;
+}
+
+/**
+ * adu_disconnect
+ *
+ * Called by the usb core when the device is removed from the system.
+ */
+static void adu_disconnect(struct usb_device *udev, void *ptr)
+{
+	struct adu_device *dev;
+	int minor;
+
+	dbg(2," %s : enter", __FUNCTION__);
+
+	dev = (struct adu_device *)ptr;
+
+	down (&minor_table_mutex);
+	down (&dev->sem);
+
+	minor = dev->minor;
+
+	/* remove our devfs node */
+	devfs_unregister(dev->devfs);
+
+	/* if the device is not opened, then we clean up right now */
+	dbg(2," %s : open count %d", __FUNCTION__, dev->open_count);
+	if (!dev->open_count) {
+		up (&dev->sem);
+		adu_delete(dev);
+	} else {
+		dev->udev = NULL;
+		up (&dev->sem);
+	}
+
+	up (&minor_table_mutex);    
+	info("ADU device adutux%d now disconnected", minor);
+
+	dbg(2," %s : leave", __FUNCTION__);
+}
+
+/**
+ *	adu_init
+ */
+static int __init adu_init(void)
+{
+	int result;
+
+	dbg(2," %s : enter", __FUNCTION__);
+
+	/* register this driver with the USB subsystem */
+	result = usb_register(&adu_driver);
+	if (result < 0) {
+		err("usb_register failed for the "__FILE__" driver. "
+		    "Error number %d", result);
+		goto exit;
+	}
+
+	info("adutux " DRIVER_DESC " " DRIVER_VERSION);
+	info("adutux is an experimental driver. Use at your own risk");
+
+exit:
+	dbg(2," %s : leave, return value %d", __FUNCTION__, result);
+
+	return result;
+}
+
+/**
+ *	adu_exit
+ */
+static void __exit adu_exit(void)
+{
+	dbg(2," %s : enter", __FUNCTION__);
+	/* deregister this driver with the USB subsystem */
+	usb_deregister(&adu_driver);
+	dbg(2," %s : leave", __FUNCTION__);
+}
+
+module_init(adu_init);
+module_exit(adu_exit);
+
+MODULE_AUTHOR(DRIVER_AUTHOR);
+MODULE_DESCRIPTION(DRIVER_DESC);
+MODULE_LICENSE("GPL");
diff -uprN -X dontdiff KERNELS/linux-2.4.35.3/drivers/usb/Config.in linux-2.4.35.3.build/drivers/usb/Config.in
-- KERNELS/linux-2.4.35.3/drivers/usb/Config.in	2007-09-24 01:02:58.000000000 +0300
+++ linux-2.4.35.3.build/drivers/usb/Config.in	2007-10-10 19:49:19.000000000 +0300
@@ -102,6 +102,7 @@ if [ "$CONFIG_USB" = "y" -o  "$CONFIG_US
 
    comment 'USB Miscellaneous drivers'
    dep_tristate '  USB Diamond Rio500 support (EXPERIMENTAL)' CONFIG_USB_RIO500 $CONFIG_USB $CONFIG_EXPERIMENTAL
+   dep_tristate '  ADU devices from Ontrak Control Systems (EXPERIMENTAL)' CONFIG_USB_ADUTUX $CONFIG_USB $CONFIG_EXPERIMENTAL
    dep_tristate '  Auerswald device support' CONFIG_USB_AUERSWALD $CONFIG_USB
    dep_tristate '  Texas Instruments Graph Link USB (aka SilverLink) cable support' CONFIG_USB_TIGL $CONFIG_USB
    dep_tristate '  Tieman Voyager USB Braille display support (EXPERIMENTAL)' CONFIG_USB_BRLVGER $CONFIG_USB $CONFIG_EXPERIMENTAL
diff -uprN -X dontdiff KERNELS/linux-2.4.35.3/drivers/usb/Makefile linux-2.4.35.3.build/drivers/usb/Makefile
-- KERNELS/linux-2.4.35.3/drivers/usb/Makefile	2007-09-24 01:02:58.000000000 +0300
+++ linux-2.4.35.3.build/drivers/usb/Makefile	2007-10-10 19:49:19.000000000 +0300
@@ -112,6 +112,7 @@ obj-$(CONFIG_USB_CATC)		+= catc.o
 obj-$(CONFIG_USB_KAWETH)        += kaweth.o
 obj-$(CONFIG_USB_CDCETHER)	+= CDCEther.o
 obj-$(CONFIG_USB_RIO500)	+= rio500.o
+obj-$(CONFIG_USB_ADUTUX)	+= adutux.o
 obj-$(CONFIG_USB_TIGL)          += tiglusb.o
 obj-$(CONFIG_USB_DSBR)		+= dsbr100.o
 obj-$(CONFIG_USB_MICROTEK)	+= microtek.o

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