usb: vstusb.c : new driver for spectrometers used by Vernier Software & Technology, Inc.

This patch adds the vstusb driver to the drivers/usb/misc directory.
This driver provides support for Vernier Software & Technology
spectrometers, all made by Ocean Optics. The driver provides both IOCTL
and read()/write() methods for sending raw data to spectrometers across
the bulk channel. Each method allows for a configured timeout.

From: Stephen Ware <stephen.ware@eqware.net>
Signed-off-by: Dennis O'Brien <dennis.obrien@eqware.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 768 insertions, 0 deletions

diff --git a/drivers/usb/misc/vstusb.c b/drivers/usb/misc/vstusb.c
new file mode 100644
index 000000000000..5ad75e4a0323
--- /dev/null
+++ b/drivers/usb/misc/vstusb.c
@@ -0,0 +1,768 @@
+/*****************************************************************************
+ *  File: drivers/usb/misc/vstusb.c
+ *
+ *  Purpose: Support for the bulk USB Vernier Spectrophotometers
+ *
+ *  Author:     Johnnie Peters
+ *              Axian Consulting
+ *              Beaverton, OR, USA 97005
+ *
+ *  Modified by:     EQware Engineering, Inc.
+ *                   Oregon City, OR, USA 97045
+ *
+ *  Copyright:  2007, 2008
+ *              Vernier Software & Technology
+ *              Beaverton, OR, USA 97005
+ *
+ *  Web:        www.vernier.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.
+ *
+ *****************************************************************************/
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/uaccess.h>
+#include <linux/usb.h>
+
+#include <linux/usb/vstusb.h>
+
+#define DRIVER_VERSION "VST USB Driver Version 1.5"
+#define DRIVER_DESC "Vernier Software Technology Bulk USB Driver"
+
+#ifdef CONFIG_USB_DYNAMIC_MINORS
+	#define VSTUSB_MINOR_BASE	0
+#else
+	#define VSTUSB_MINOR_BASE	199
+#endif
+
+#define USB_VENDOR_OCEANOPTICS	0x2457
+#define USB_VENDOR_VERNIER	0x08F7	/* Vernier Software & Technology */
+
+#define USB_PRODUCT_USB2000	0x1002
+#define USB_PRODUCT_ADC1000_FW	0x1003	/* firmware download (renumerates) */
+#define USB_PRODUCT_ADC1000	0x1004
+#define USB_PRODUCT_HR2000_FW	0x1009	/* firmware download (renumerates) */
+#define USB_PRODUCT_HR2000	0x100A
+#define USB_PRODUCT_HR4000_FW	0x1011	/* firmware download (renumerates) */
+#define USB_PRODUCT_HR4000	0x1012
+#define USB_PRODUCT_USB650	0x1014	/* "Red Tide" */
+#define USB_PRODUCT_QE65000	0x1018
+#define USB_PRODUCT_USB4000	0x1022
+#define USB_PRODUCT_USB325	0x1024	/* "Vernier Spectrometer" */
+
+#define USB_PRODUCT_LABPRO	0x0001
+#define USB_PRODUCT_LABQUEST	0x0005
+
+static struct usb_device_id id_table[] = {
+	{ USB_DEVICE(USB_VENDOR_OCEANOPTICS, USB_PRODUCT_USB2000)},
+	{ USB_DEVICE(USB_VENDOR_OCEANOPTICS, USB_PRODUCT_HR4000)},
+	{ USB_DEVICE(USB_VENDOR_OCEANOPTICS, USB_PRODUCT_USB650)},
+	{ USB_DEVICE(USB_VENDOR_OCEANOPTICS, USB_PRODUCT_USB4000)},
+	{ USB_DEVICE(USB_VENDOR_OCEANOPTICS, USB_PRODUCT_USB325)},
+	{ USB_DEVICE(USB_VENDOR_VERNIER, USB_PRODUCT_LABQUEST)},
+	{ USB_DEVICE(USB_VENDOR_VERNIER, USB_PRODUCT_LABPRO)},
+	{},
+};
+
+MODULE_DEVICE_TABLE(usb, id_table);
+
+struct vstusb_device {
+	struct mutex            lock;
+	struct usb_device       *usb_dev;
+	char                    present;
+	char                    isopen;
+	struct usb_anchor       submitted;
+	int                     rd_pipe;
+	int                     rd_timeout_ms;
+	int                     wr_pipe;
+	int                     wr_timeout_ms;
+};
+
+static struct usb_driver vstusb_driver;
+
+static int vstusb_open(struct inode *inode, struct file *file)
+{
+	struct vstusb_device *vstdev;
+	struct usb_interface *interface;
+
+	interface = usb_find_interface(&vstusb_driver, iminor(inode));
+
+	if (!interface) {
+		printk(KERN_ERR KBUILD_MODNAME
+		       ": %s - error, can't find device for minor %d\n",
+		       __func__, iminor(inode));
+		return -ENODEV;
+	}
+
+	vstdev = usb_get_intfdata(interface);
+
+	if (!vstdev)
+		return -ENODEV;
+
+	/* lock this device */
+	mutex_lock(&vstdev->lock);
+
+	/* can only open one time */
+	if ((!vstdev->present) || (vstdev->isopen)) {
+		mutex_unlock(&vstdev->lock);
+		return -EBUSY;
+	}
+
+	vstdev->isopen = 1;
+
+	/* save device in the file's private structure */
+	file->private_data = vstdev;
+
+	dev_dbg(&vstdev->usb_dev->dev, "%s: opened\n", __func__);
+
+	mutex_unlock(&vstdev->lock);
+
+	return 0;
+}
+
+static int vstusb_close(struct inode *inode, struct file *file)
+{
+	struct vstusb_device *vstdev;
+
+	vstdev = file->private_data;
+
+	if (vstdev == NULL)
+		return -ENODEV;
+
+	mutex_lock(&vstdev->lock);
+
+	vstdev->isopen = 0;
+	file->private_data = NULL;
+
+	/* if device is no longer present */
+	if (!vstdev->present) {
+		mutex_unlock(&vstdev->lock);
+		kfree(vstdev);
+	} else
+		mutex_unlock(&vstdev->lock);
+
+	return 0;
+}
+
+static void usb_api_blocking_completion(struct urb *urb)
+{
+	struct completion *completeit = urb->context;
+
+	complete(completeit);
+}
+
+static int vstusb_fill_and_send_urb(struct urb *urb,
+				    struct usb_device *usb_dev,
+				    unsigned int pipe, void *data,
+				    unsigned int len, struct completion *done)
+{
+	struct usb_host_endpoint *ep;
+	struct usb_host_endpoint **hostep;
+	unsigned int pipend;
+
+	int status;
+
+	hostep = usb_pipein(pipe) ? usb_dev->ep_in : usb_dev->ep_out;
+	pipend = usb_pipeendpoint(pipe);
+	ep = hostep[pipend];
+
+	if (!ep || (len == 0))
+		return -EINVAL;
+
+	if ((ep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
+	    == USB_ENDPOINT_XFER_INT) {
+		pipe = (pipe & ~(3 << 30)) | (PIPE_INTERRUPT << 30);
+		usb_fill_int_urb(urb, usb_dev, pipe, data, len,
+				 (usb_complete_t)usb_api_blocking_completion,
+				 NULL, ep->desc.bInterval);
+	} else
+		usb_fill_bulk_urb(urb, usb_dev, pipe, data, len,
+				  (usb_complete_t)usb_api_blocking_completion,
+				  NULL);
+
+	init_completion(done);
+	urb->context = done;
+	urb->actual_length = 0;
+	status = usb_submit_urb(urb, GFP_KERNEL);
+
+	return status;
+}
+
+static int vstusb_complete_urb(struct urb *urb, struct completion *done,
+			       int timeout, int *actual_length)
+{
+	unsigned long expire;
+	int status;
+
+	expire = timeout ? msecs_to_jiffies(timeout) : MAX_SCHEDULE_TIMEOUT;
+	if (!wait_for_completion_interruptible_timeout(done, expire)) {
+		usb_kill_urb(urb);
+		status = urb->status == -ENOENT ? -ETIMEDOUT : urb->status;
+
+		dev_dbg(&urb->dev->dev,
+			"%s timed out on ep%d%s len=%d/%d, urb status = %d\n",
+			current->comm,
+			usb_pipeendpoint(urb->pipe),
+			usb_pipein(urb->pipe) ? "in" : "out",
+			urb->actual_length,
+			urb->transfer_buffer_length,
+			urb->status);
+
+	} else {
+		if (signal_pending(current)) {
+			/* if really an error */
+			if (urb->status && !((urb->status == -ENOENT)     ||
+					     (urb->status == -ECONNRESET) ||
+					     (urb->status == -ESHUTDOWN))) {
+				status = -EINTR;
+				usb_kill_urb(urb);
+			} else {
+				status = 0;
+			}
+
+			dev_dbg(&urb->dev->dev,
+				"%s: signal pending on ep%d%s len=%d/%d,"
+				"urb status = %d\n",
+				current->comm,
+				usb_pipeendpoint(urb->pipe),
+				usb_pipein(urb->pipe) ? "in" : "out",
+				urb->actual_length,
+				urb->transfer_buffer_length,
+				urb->status);
+
+		} else {
+			status = urb->status;
+		}
+	}
+
+	if (actual_length)
+		*actual_length = urb->actual_length;
+
+	return status;
+}
+
+static ssize_t vstusb_read(struct file *file, char __user *buffer,
+			   size_t count, loff_t *ppos)
+{
+	struct vstusb_device *vstdev;
+	int cnt = -1;
+	void *buf;
+	int retval = 0;
+
+	struct urb              *urb;
+	struct usb_device       *dev;
+	unsigned int            pipe;
+	int                     timeout;
+
+	DECLARE_COMPLETION_ONSTACK(done);
+
+	vstdev = file->private_data;
+
+	if (vstdev == NULL)
+		return -ENODEV;
+
+	/* verify that we actually want to read some data */
+	if (count == 0)
+		return -EINVAL;
+
+	/* lock this object */
+	if (mutex_lock_interruptible(&vstdev->lock))
+		return -ERESTARTSYS;
+
+	/* anyone home */
+	if (!vstdev->present) {
+		mutex_unlock(&vstdev->lock);
+		printk(KERN_ERR KBUILD_MODNAME
+		       ": %s: device not present\n", __func__);
+		return -ENODEV;
+	}
+
+	/* pull out the necessary data */
+	dev =     vstdev->usb_dev;
+	pipe =    usb_rcvbulkpipe(dev, vstdev->rd_pipe);
+	timeout = vstdev->rd_timeout_ms;
+
+	buf = kmalloc(count, GFP_KERNEL);
+	if (buf == NULL) {
+		mutex_unlock(&vstdev->lock);
+		return -ENOMEM;
+	}
+
+	urb = usb_alloc_urb(0, GFP_KERNEL);
+	if (!urb) {
+		kfree(buf);
+		mutex_unlock(&vstdev->lock);
+		return -ENOMEM;
+	}
+
+	usb_anchor_urb(urb, &vstdev->submitted);
+	retval = vstusb_fill_and_send_urb(urb, dev, pipe, buf, count, &done);
+	mutex_unlock(&vstdev->lock);
+	if (retval) {
+		usb_unanchor_urb(urb);
+		dev_err(&dev->dev, "%s: error %d filling and sending urb %d\n",
+			__func__, retval, pipe);
+		goto exit;
+	}
+
+	retval = vstusb_complete_urb(urb, &done, timeout, &cnt);
+	if (retval) {
+		dev_err(&dev->dev, "%s: error %d completing urb %d\n",
+			__func__, retval, pipe);
+		goto exit;
+	}
+
+	if (copy_to_user(buffer, buf, cnt)) {
+		dev_err(&dev->dev, "%s: can't copy_to_user\n", __func__);
+		retval = -EFAULT;
+	} else {
+		retval = cnt;
+		dev_dbg(&dev->dev, "%s: read %d bytes from pipe %d\n",
+			__func__, cnt, pipe);
+	}
+
+exit:
+	usb_free_urb(urb);
+	kfree(buf);
+	return retval;
+}
+
+static ssize_t vstusb_write(struct file *file, const char __user *buffer,
+			    size_t count, loff_t *ppos)
+{
+	struct vstusb_device *vstdev;
+	int cnt = -1;
+	void *buf;
+	int retval = 0;
+
+	struct urb              *urb;
+	struct usb_device       *dev;
+	unsigned int            pipe;
+	int                     timeout;
+
+	DECLARE_COMPLETION_ONSTACK(done);
+
+	vstdev = file->private_data;
+
+	if (vstdev == NULL)
+		return -ENODEV;
+
+	/* verify that we actually have some data to write */
+	if (count == 0)
+		return retval;
+
+	/* lock this object */
+	if (mutex_lock_interruptible(&vstdev->lock))
+		return -ERESTARTSYS;
+
+	/* anyone home */
+	if (!vstdev->present) {
+		mutex_unlock(&vstdev->lock);
+		printk(KERN_ERR KBUILD_MODNAME
+		       ": %s: device not present\n", __func__);
+		return -ENODEV;
+	}
+
+	/* pull out the necessary data */
+	dev =     vstdev->usb_dev;
+	pipe =    usb_sndbulkpipe(dev, vstdev->wr_pipe);
+	timeout = vstdev->wr_timeout_ms;
+
+	buf = kmalloc(count, GFP_KERNEL);
+	if (buf == NULL) {
+		mutex_unlock(&vstdev->lock);
+		return -ENOMEM;
+	}
+
+	urb = usb_alloc_urb(0, GFP_KERNEL);
+	if (!urb) {
+		kfree(buf);
+		mutex_unlock(&vstdev->lock);
+		return -ENOMEM;
+	}
+
+	if (copy_from_user(buf, buffer, count)) {
+		dev_err(&dev->dev, "%s: can't copy_from_user\n", __func__);
+		retval = -EFAULT;
+		goto exit;
+	}
+
+	usb_anchor_urb(urb, &vstdev->submitted);
+	retval = vstusb_fill_and_send_urb(urb, dev, pipe, buf, count, &done);
+	mutex_unlock(&vstdev->lock);
+	if (retval) {
+		usb_unanchor_urb(urb);
+		dev_err(&dev->dev, "%s: error %d filling and sending urb %d\n",
+			__func__, retval, pipe);
+		goto exit;
+	}
+
+	retval = vstusb_complete_urb(urb, &done, timeout, &cnt);
+	if (retval) {
+		dev_err(&dev->dev, "%s: error %d completing urb %d\n",
+			__func__, retval, pipe);
+		goto exit;
+	} else {
+		retval = cnt;
+		dev_dbg(&dev->dev, "%s: sent %d bytes to pipe %d\n",
+			__func__, cnt, pipe);
+	}
+
+exit:
+	usb_free_urb(urb);
+	kfree(buf);
+	return retval;
+}
+
+static long vstusb_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
+{
+	int retval = 0;
+	int cnt = -1;
+	void __user *data = (void __user *)arg;
+	struct vstusb_args usb_data;
+
+	struct vstusb_device *vstdev;
+	void *buffer = NULL; /* must be initialized. buffer is
+			      *	referenced on exit but not all
+			      * ioctls allocate it */
+
+	struct urb              *urb = NULL; /* must be initialized. urb is
+					      *	referenced on exit but not all
+					      * ioctls allocate it */
+	struct usb_device       *dev;
+	unsigned int            pipe;
+	int                     timeout;
+
+	DECLARE_COMPLETION_ONSTACK(done);
+
+	vstdev = file->private_data;
+
+	if (_IOC_TYPE(cmd) != VST_IOC_MAGIC) {
+		dev_warn(&vstdev->usb_dev->dev,
+			 "%s: ioctl command %x, bad ioctl magic %x, "
+			 "expected %x\n", __func__, cmd,
+			 _IOC_TYPE(cmd), VST_IOC_MAGIC);
+		return -EINVAL;
+	}
+
+	if (vstdev == NULL)
+		return -ENODEV;
+
+	if (copy_from_user(&usb_data, data, sizeof(struct vstusb_args))) {
+		dev_err(&vstdev->usb_dev->dev, "%s: can't copy_from_user\n",
+			__func__);
+		return -EFAULT;
+	}
+
+	/* lock this object */
+	if (mutex_lock_interruptible(&vstdev->lock)) {
+		retval = -ERESTARTSYS;
+		goto exit;
+	}
+
+	/* anyone home */
+	if (!vstdev->present) {
+		mutex_unlock(&vstdev->lock);
+		dev_err(&vstdev->usb_dev->dev, "%s: device not present\n",
+			__func__);
+		retval = -ENODEV;
+		goto exit;
+	}
+
+	/* pull out the necessary data */
+	dev = vstdev->usb_dev;
+
+	switch (cmd) {
+
+	case IOCTL_VSTUSB_CONFIG_RW:
+
+		vstdev->rd_pipe = usb_data.rd_pipe;
+		vstdev->rd_timeout_ms = usb_data.rd_timeout_ms;
+		vstdev->wr_pipe = usb_data.wr_pipe;
+		vstdev->wr_timeout_ms = usb_data.wr_timeout_ms;
+
+		mutex_unlock(&vstdev->lock);
+
+		dev_dbg(&dev->dev, "%s: setting pipes/timeouts, "
+			"rdpipe = %d, rdtimeout = %d, "
+			"wrpipe = %d, wrtimeout = %d\n", __func__,
+			vstdev->rd_pipe, vstdev->rd_timeout_ms,
+			vstdev->wr_pipe, vstdev->wr_timeout_ms);
+		break;
+
+	case IOCTL_VSTUSB_SEND_PIPE:
+
+		if (usb_data.count == 0) {
+			mutex_unlock(&vstdev->lock);
+			retval = -EINVAL;
+			goto exit;
+		}
+
+		buffer = kmalloc(usb_data.count, GFP_KERNEL);
+		if (buffer == NULL) {
+			mutex_unlock(&vstdev->lock);
+			retval = -ENOMEM;
+			goto exit;
+		}
+
+		urb = usb_alloc_urb(0, GFP_KERNEL);
+		if (!urb) {
+			mutex_unlock(&vstdev->lock);
+			retval = -ENOMEM;
+			goto exit;
+		}
+
+		timeout = usb_data.timeout_ms;
+
+		pipe = usb_sndbulkpipe(dev, usb_data.pipe);
+
+		if (copy_from_user(buffer, usb_data.buffer, usb_data.count)) {
+			dev_err(&dev->dev, "%s: can't copy_from_user\n",
+				__func__);
+			mutex_unlock(&vstdev->lock);
+			retval = -EFAULT;
+			goto exit;
+		}
+
+		usb_anchor_urb(urb, &vstdev->submitted);
+		retval = vstusb_fill_and_send_urb(urb, dev, pipe, buffer,
+						  usb_data.count, &done);
+		mutex_unlock(&vstdev->lock);
+		if (retval) {
+			usb_unanchor_urb(urb);
+			dev_err(&dev->dev,
+				"%s: error %d filling and sending urb %d\n",
+				__func__, retval, pipe);
+			goto exit;
+		}
+
+		retval = vstusb_complete_urb(urb, &done, timeout, &cnt);
+		if (retval) {
+			dev_err(&dev->dev, "%s: error %d completing urb %d\n",
+				__func__, retval, pipe);
+		}
+
+		break;
+	case IOCTL_VSTUSB_RECV_PIPE:
+
+		if (usb_data.count == 0) {
+			mutex_unlock(&vstdev->lock);
+			retval = -EINVAL;
+			goto exit;
+		}
+
+		buffer = kmalloc(usb_data.count, GFP_KERNEL);
+		if (buffer == NULL) {
+			mutex_unlock(&vstdev->lock);
+			retval = -ENOMEM;
+			goto exit;
+		}
+
+		urb = usb_alloc_urb(0, GFP_KERNEL);
+		if (!urb) {
+			mutex_unlock(&vstdev->lock);
+			retval = -ENOMEM;
+			goto exit;
+		}
+
+		timeout = usb_data.timeout_ms;
+
+		pipe = usb_rcvbulkpipe(dev, usb_data.pipe);
+
+		usb_anchor_urb(urb, &vstdev->submitted);
+		retval = vstusb_fill_and_send_urb(urb, dev, pipe, buffer,
+						  usb_data.count, &done);
+		mutex_unlock(&vstdev->lock);
+		if (retval) {
+			usb_unanchor_urb(urb);
+			dev_err(&dev->dev,
+				"%s: error %d filling and sending urb %d\n",
+				__func__, retval, pipe);
+			goto exit;
+		}
+
+		retval = vstusb_complete_urb(urb, &done, timeout, &cnt);
+		if (retval) {
+			dev_err(&dev->dev, "%s: error %d completing urb %d\n",
+				__func__, retval, pipe);
+			goto exit;
+		}
+
+		if (copy_to_user(usb_data.buffer, buffer, cnt)) {
+			dev_err(&dev->dev, "%s: can't copy_to_user\n",
+				__func__);
+			retval = -EFAULT;
+			goto exit;
+		}
+
+		usb_data.count = cnt;
+		if (copy_to_user(data, &usb_data, sizeof(struct vstusb_args))) {
+			dev_err(&dev->dev, "%s: can't copy_to_user\n",
+				__func__);
+			retval = -EFAULT;
+		} else {
+			dev_dbg(&dev->dev, "%s: recv %d bytes from pipe %d\n",
+				__func__, usb_data.count, usb_data.pipe);
+		}
+
+		break;
+
+	default:
+		mutex_unlock(&vstdev->lock);
+		dev_warn(&dev->dev, "ioctl_vstusb: invalid ioctl cmd %x\n",
+			 cmd);
+		return -EINVAL;
+		break;
+	}
+exit:
+	usb_free_urb(urb);
+	kfree(buffer);
+	return retval;
+}
+
+static const struct file_operations vstusb_fops = {
+	.owner =                THIS_MODULE,
+	.read =                 vstusb_read,
+	.write =                vstusb_write,
+	.unlocked_ioctl =       vstusb_ioctl,
+	.compat_ioctl =         vstusb_ioctl,
+	.open =                 vstusb_open,
+	.release =              vstusb_close,
+};
+
+static struct usb_class_driver usb_vstusb_class = {
+	.name =         "usb/vstusb%d",
+	.fops =         &vstusb_fops,
+	.minor_base =   VSTUSB_MINOR_BASE,
+};
+
+static int vstusb_probe(struct usb_interface *intf,
+			const struct usb_device_id *id)
+{
+	struct usb_device *dev = interface_to_usbdev(intf);
+	struct vstusb_device *vstdev;
+	int i;
+	int retval = 0;
+
+	/* allocate memory for our device state and intialize it */
+
+	vstdev = kzalloc(sizeof(*vstdev), GFP_KERNEL);
+	if (vstdev == NULL)
+		return -ENOMEM;
+
+	mutex_init(&vstdev->lock);
+
+	i = dev->descriptor.bcdDevice;
+
+	dev_dbg(&intf->dev, "Version %1d%1d.%1d%1d found at address %d\n",
+		(i & 0xF000) >> 12, (i & 0xF00) >> 8,
+		(i & 0xF0) >> 4, (i & 0xF), dev->devnum);
+
+	vstdev->present = 1;
+	vstdev->isopen = 0;
+	vstdev->usb_dev = dev;
+	init_usb_anchor(&vstdev->submitted);
+
+	usb_set_intfdata(intf, vstdev);
+	retval = usb_register_dev(intf, &usb_vstusb_class);
+	if (retval) {
+		dev_err(&intf->dev,
+			"%s: Not able to get a minor for this device.\n",
+			__func__);
+		usb_set_intfdata(intf, NULL);
+		kfree(vstdev);
+		return retval;
+	}
+
+	/* let the user know what node this device is now attached to */
+	dev_info(&intf->dev,
+		 "VST USB Device #%d now attached to major %d minor %d\n",
+		 (intf->minor - VSTUSB_MINOR_BASE), USB_MAJOR, intf->minor);
+
+	dev_info(&intf->dev, "%s, %s\n", DRIVER_DESC, DRIVER_VERSION);
+
+	return retval;
+}
+
+static void vstusb_disconnect(struct usb_interface *intf)
+{
+	struct vstusb_device *vstdev = usb_get_intfdata(intf);
+
+	usb_deregister_dev(intf, &usb_vstusb_class);
+	usb_set_intfdata(intf, NULL);
+
+	if (vstdev) {
+
+		mutex_lock(&vstdev->lock);
+		vstdev->present = 0;
+
+		usb_kill_anchored_urbs(&vstdev->submitted);
+
+		/* if the device is not opened, then we clean up right now */
+		if (!vstdev->isopen) {
+			mutex_unlock(&vstdev->lock);
+			kfree(vstdev);
+		} else
+			mutex_unlock(&vstdev->lock);
+
+	}
+}
+
+static int vstusb_suspend(struct usb_interface *intf, pm_message_t message)
+{
+	struct vstusb_device *vstdev = usb_get_intfdata(intf);
+	int time;
+	if (!vstdev)
+		return 0;
+
+	mutex_lock(&vstdev->lock);
+	time = usb_wait_anchor_empty_timeout(&vstdev->submitted, 1000);
+	if (!time)
+		usb_kill_anchored_urbs(&vstdev->submitted);
+	mutex_unlock(&vstdev->lock);
+
+	return 0;
+}
+
+static int vstusb_resume(struct usb_interface *intf)
+{
+	return 0;
+}
+
+static struct usb_driver vstusb_driver = {
+	.name =         "vstusb",
+	.probe =        vstusb_probe,
+	.disconnect =   vstusb_disconnect,
+	.suspend =      vstusb_suspend,
+	.resume =       vstusb_resume,
+	.id_table = id_table,
+};
+
+static int __init vstusb_init(void)
+{
+	int rc;
+
+	rc = usb_register(&vstusb_driver);
+	if (rc)
+		printk(KERN_ERR "%s: failed to register (%d)", __func__, rc);
+
+	return rc;
+}
+
+static void __exit vstusb_exit(void)
+{
+	usb_deregister(&vstusb_driver);
+}
+
+module_init(vstusb_init);
+module_exit(vstusb_exit);
+
+MODULE_AUTHOR("Dennis O'Brien/Stephen Ware");
+MODULE_DESCRIPTION(DRIVER_VERSION);
+MODULE_LICENSE("GPL");