v4.19.13 snapshot.
diff --git a/drivers/usb/misc/adutux.c b/drivers/usb/misc/adutux.c
new file mode 100644
index 0000000..9465fb9
--- /dev/null
+++ b/drivers/usb/misc/adutux.c
@@ -0,0 +1,794 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * 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)
+ *
+ * derived from the Lego USB Tower driver 0.56:
+ * Copyright (c) 2003 David Glance <davidgsf@sourceforge.net>
+ * 2001 Juergen Stuber <stuber@loria.fr>
+ * that was derived from USB Skeleton driver - 0.5
+ * Copyright (c) 2001 Greg Kroah-Hartman (greg@kroah.com)
+ *
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/kernel.h>
+#include <linux/sched/signal.h>
+#include <linux/errno.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/usb.h>
+#include <linux/mutex.h>
+#include <linux/uaccess.h>
+
+#define DRIVER_AUTHOR "John Homppi"
+#define DRIVER_DESC "adutux (see www.ontrak.net)"
+
+/* 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 const 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);
+
+#ifdef CONFIG_USB_DYNAMIC_MINORS
+#define ADU_MINOR_BASE 0
+#else
+#define ADU_MINOR_BASE 67
+#endif
+
+/* we can have up to this number of device plugged in at once */
+#define MAX_DEVICES 16
+
+#define COMMAND_TIMEOUT (2*HZ)
+
+/*
+ * The locking scheme is a vanilla 3-lock:
+ * adu_device.buflock: A spinlock, covers what IRQs touch.
+ * adutux_mutex: A Static lock to cover open_count. It would also cover
+ * any globals, but we don't have them in 2.6.
+ * adu_device.mtx: A mutex to hold across sleepers like copy_from_user.
+ * It covers all of adu_device, except the open_count
+ * and what .buflock covers.
+ */
+
+/* Structure to hold all of our device specific stuff */
+struct adu_device {
+ struct mutex mtx;
+ struct usb_device *udev; /* save off the usb device pointer */
+ struct usb_interface *interface;
+ unsigned int minor; /* the starting minor number for this device */
+ char serial_number[8];
+
+ 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;
+ int out_urb_finished;
+};
+
+static DEFINE_MUTEX(adutux_mutex);
+
+static struct usb_driver adu_driver;
+
+static inline void adu_debug_data(struct device *dev, const char *function,
+ int size, const unsigned char *data)
+{
+ dev_dbg(dev, "%s - length = %d, data = %*ph\n",
+ function, size, size, data);
+}
+
+/**
+ * adu_abort_transfers
+ * aborts transfers and frees associated data structures
+ */
+static void adu_abort_transfers(struct adu_device *dev)
+{
+ unsigned long flags;
+
+ if (dev->udev == NULL)
+ return;
+
+ /* shutdown transfer */
+
+ /* XXX Anchor these instead */
+ spin_lock_irqsave(&dev->buflock, flags);
+ if (!dev->read_urb_finished) {
+ spin_unlock_irqrestore(&dev->buflock, flags);
+ usb_kill_urb(dev->interrupt_in_urb);
+ } else
+ spin_unlock_irqrestore(&dev->buflock, flags);
+
+ spin_lock_irqsave(&dev->buflock, flags);
+ if (!dev->out_urb_finished) {
+ spin_unlock_irqrestore(&dev->buflock, flags);
+ wait_event_timeout(dev->write_wait, dev->out_urb_finished,
+ COMMAND_TIMEOUT);
+ usb_kill_urb(dev->interrupt_out_urb);
+ } else
+ spin_unlock_irqrestore(&dev->buflock, flags);
+}
+
+static void adu_delete(struct adu_device *dev)
+{
+ /* free data structures */
+ usb_free_urb(dev->interrupt_in_urb);
+ usb_free_urb(dev->interrupt_out_urb);
+ kfree(dev->read_buffer_primary);
+ kfree(dev->read_buffer_secondary);
+ kfree(dev->interrupt_in_buffer);
+ kfree(dev->interrupt_out_buffer);
+ kfree(dev);
+}
+
+static void adu_interrupt_in_callback(struct urb *urb)
+{
+ struct adu_device *dev = urb->context;
+ int status = urb->status;
+ unsigned long flags;
+
+ adu_debug_data(&dev->udev->dev, __func__,
+ urb->actual_length, urb->transfer_buffer);
+
+ spin_lock_irqsave(&dev->buflock, flags);
+
+ if (status != 0) {
+ if ((status != -ENOENT) && (status != -ECONNRESET) &&
+ (status != -ESHUTDOWN)) {
+ dev_dbg(&dev->udev->dev,
+ "%s : nonzero status received: %d\n",
+ __func__, status);
+ }
+ goto exit;
+ }
+
+ if (urb->actual_length > 0 && dev->interrupt_in_buffer[0] != 0x00) {
+ if (dev->read_buffer_length <
+ (4 * usb_endpoint_maxp(dev->interrupt_in_endpoint)) -
+ (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;
+ dev_dbg(&dev->udev->dev,"%s reading %d\n", __func__,
+ urb->actual_length);
+ } else {
+ dev_dbg(&dev->udev->dev,"%s : read_buffer overflow\n",
+ __func__);
+ }
+ }
+
+exit:
+ dev->read_urb_finished = 1;
+ spin_unlock_irqrestore(&dev->buflock, flags);
+ /* always wake up so we recover from errors */
+ wake_up_interruptible(&dev->read_wait);
+}
+
+static void adu_interrupt_out_callback(struct urb *urb)
+{
+ struct adu_device *dev = urb->context;
+ int status = urb->status;
+ unsigned long flags;
+
+ adu_debug_data(&dev->udev->dev, __func__,
+ urb->actual_length, urb->transfer_buffer);
+
+ if (status != 0) {
+ if ((status != -ENOENT) &&
+ (status != -ECONNRESET)) {
+ dev_dbg(&dev->udev->dev,
+ "%s :nonzero status received: %d\n", __func__,
+ status);
+ }
+ return;
+ }
+
+ spin_lock_irqsave(&dev->buflock, flags);
+ dev->out_urb_finished = 1;
+ wake_up(&dev->write_wait);
+ spin_unlock_irqrestore(&dev->buflock, flags);
+}
+
+static int adu_open(struct inode *inode, struct file *file)
+{
+ struct adu_device *dev = NULL;
+ struct usb_interface *interface;
+ int subminor;
+ int retval;
+
+ subminor = iminor(inode);
+
+ retval = mutex_lock_interruptible(&adutux_mutex);
+ if (retval)
+ goto exit_no_lock;
+
+ interface = usb_find_interface(&adu_driver, subminor);
+ if (!interface) {
+ pr_err("%s - error, can't find device for minor %d\n",
+ __func__, subminor);
+ retval = -ENODEV;
+ goto exit_no_device;
+ }
+
+ dev = usb_get_intfdata(interface);
+ if (!dev || !dev->udev) {
+ retval = -ENODEV;
+ goto exit_no_device;
+ }
+
+ /* check that nobody else is using the device */
+ if (dev->open_count) {
+ retval = -EBUSY;
+ goto exit_no_device;
+ }
+
+ ++dev->open_count;
+ dev_dbg(&dev->udev->dev, "%s: open count %d\n", __func__,
+ dev->open_count);
+
+ /* 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 */
+ usb_fill_int_urb(dev->interrupt_in_urb, dev->udev,
+ usb_rcvintpipe(dev->udev,
+ dev->interrupt_in_endpoint->bEndpointAddress),
+ dev->interrupt_in_buffer,
+ usb_endpoint_maxp(dev->interrupt_in_endpoint),
+ adu_interrupt_in_callback, dev,
+ dev->interrupt_in_endpoint->bInterval);
+ dev->read_urb_finished = 0;
+ if (usb_submit_urb(dev->interrupt_in_urb, GFP_KERNEL))
+ dev->read_urb_finished = 1;
+ /* we ignore failure */
+ /* end of fixup for first read */
+
+ /* initialize out direction */
+ dev->out_urb_finished = 1;
+
+ retval = 0;
+
+exit_no_device:
+ mutex_unlock(&adutux_mutex);
+exit_no_lock:
+ return retval;
+}
+
+static void adu_release_internal(struct adu_device *dev)
+{
+ /* decrement our usage count for the device */
+ --dev->open_count;
+ dev_dbg(&dev->udev->dev, "%s : open count %d\n", __func__,
+ dev->open_count);
+ if (dev->open_count <= 0) {
+ adu_abort_transfers(dev);
+ dev->open_count = 0;
+ }
+}
+
+static int adu_release(struct inode *inode, struct file *file)
+{
+ struct adu_device *dev;
+ int retval = 0;
+
+ if (file == NULL) {
+ retval = -ENODEV;
+ goto exit;
+ }
+
+ dev = file->private_data;
+ if (dev == NULL) {
+ retval = -ENODEV;
+ goto exit;
+ }
+
+ mutex_lock(&adutux_mutex); /* not interruptible */
+
+ if (dev->open_count <= 0) {
+ dev_dbg(&dev->udev->dev, "%s : device not opened\n", __func__);
+ retval = -ENODEV;
+ goto unlock;
+ }
+
+ adu_release_internal(dev);
+ if (dev->udev == NULL) {
+ /* the device was unplugged before the file was released */
+ if (!dev->open_count) /* ... and we're the last user */
+ adu_delete(dev);
+ }
+unlock:
+ mutex_unlock(&adutux_mutex);
+exit:
+ return retval;
+}
+
+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);
+
+ dev = file->private_data;
+ if (mutex_lock_interruptible(&dev->mtx))
+ return -ERESTARTSYS;
+
+ /* verify that the device wasn't unplugged */
+ if (dev->udev == NULL) {
+ retval = -ENODEV;
+ pr_err("No device or device unplugged %d\n", retval);
+ goto exit;
+ }
+
+ /* verify that some data was requested */
+ if (count == 0) {
+ dev_dbg(&dev->udev->dev, "%s : read request of 0 bytes\n",
+ __func__);
+ goto exit;
+ }
+
+ timeout = COMMAND_TIMEOUT;
+ dev_dbg(&dev->udev->dev, "%s : about to start looping\n", __func__);
+ while (bytes_to_read) {
+ int data_in_secondary = dev->secondary_tail - dev->secondary_head;
+ dev_dbg(&dev->udev->dev,
+ "%s : while, data_in_secondary=%d, status=%d\n",
+ __func__, 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) {
+ retval = -EFAULT;
+ goto exit;
+ }
+ dev->secondary_head += (amount - i);
+ bytes_read += (amount - i);
+ bytes_to_read -= (amount - i);
+ } 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;
+ dev_dbg(&dev->udev->dev,
+ "%s : swap, read_buffer_length = %d\n",
+ __func__, 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->read_urb_finished) {
+ /* somebody is doing IO */
+ spin_unlock_irqrestore(&dev->buflock, flags);
+ dev_dbg(&dev->udev->dev,
+ "%s : submitted already\n",
+ __func__);
+ } else {
+ /* we must initiate input */
+ dev_dbg(&dev->udev->dev,
+ "%s : initiate input\n",
+ __func__);
+ dev->read_urb_finished = 0;
+ spin_unlock_irqrestore(&dev->buflock, flags);
+
+ usb_fill_int_urb(dev->interrupt_in_urb, dev->udev,
+ usb_rcvintpipe(dev->udev,
+ dev->interrupt_in_endpoint->bEndpointAddress),
+ dev->interrupt_in_buffer,
+ usb_endpoint_maxp(dev->interrupt_in_endpoint),
+ adu_interrupt_in_callback,
+ dev,
+ dev->interrupt_in_endpoint->bInterval);
+ retval = usb_submit_urb(dev->interrupt_in_urb, GFP_KERNEL);
+ if (retval) {
+ dev->read_urb_finished = 1;
+ if (retval == -ENOMEM) {
+ retval = bytes_read ? bytes_read : -ENOMEM;
+ }
+ dev_dbg(&dev->udev->dev,
+ "%s : submit failed\n",
+ __func__);
+ goto exit;
+ }
+ }
+
+ /* we wait for I/O to complete */
+ set_current_state(TASK_INTERRUPTIBLE);
+ add_wait_queue(&dev->read_wait, &wait);
+ spin_lock_irqsave(&dev->buflock, flags);
+ if (!dev->read_urb_finished) {
+ spin_unlock_irqrestore(&dev->buflock, flags);
+ timeout = schedule_timeout(COMMAND_TIMEOUT);
+ } else {
+ spin_unlock_irqrestore(&dev->buflock, flags);
+ set_current_state(TASK_RUNNING);
+ }
+ remove_wait_queue(&dev->read_wait, &wait);
+
+ if (timeout <= 0) {
+ dev_dbg(&dev->udev->dev,
+ "%s : timeout\n", __func__);
+ retval = bytes_read ? bytes_read : -ETIMEDOUT;
+ goto exit;
+ }
+
+ if (signal_pending(current)) {
+ dev_dbg(&dev->udev->dev,
+ "%s : signal pending\n",
+ __func__);
+ retval = bytes_read ? bytes_read : -EINTR;
+ goto exit;
+ }
+ }
+ }
+ }
+
+ retval = bytes_read;
+ /* if the primary buffer is empty then use it */
+ spin_lock_irqsave(&dev->buflock, flags);
+ if (should_submit && dev->read_urb_finished) {
+ dev->read_urb_finished = 0;
+ spin_unlock_irqrestore(&dev->buflock, flags);
+ usb_fill_int_urb(dev->interrupt_in_urb, dev->udev,
+ usb_rcvintpipe(dev->udev,
+ dev->interrupt_in_endpoint->bEndpointAddress),
+ dev->interrupt_in_buffer,
+ usb_endpoint_maxp(dev->interrupt_in_endpoint),
+ adu_interrupt_in_callback,
+ dev,
+ dev->interrupt_in_endpoint->bInterval);
+ if (usb_submit_urb(dev->interrupt_in_urb, GFP_KERNEL) != 0)
+ dev->read_urb_finished = 1;
+ /* we ignore failure */
+ } else {
+ spin_unlock_irqrestore(&dev->buflock, flags);
+ }
+
+exit:
+ /* unlock the device */
+ mutex_unlock(&dev->mtx);
+
+ return retval;
+}
+
+static ssize_t adu_write(struct file *file, const __user char *buffer,
+ size_t count, loff_t *ppos)
+{
+ DECLARE_WAITQUEUE(waita, current);
+ struct adu_device *dev;
+ size_t bytes_written = 0;
+ size_t bytes_to_write;
+ size_t buffer_size;
+ unsigned long flags;
+ int retval;
+
+ dev = file->private_data;
+
+ retval = mutex_lock_interruptible(&dev->mtx);
+ if (retval)
+ goto exit_nolock;
+
+ /* verify that the device wasn't unplugged */
+ if (dev->udev == NULL) {
+ retval = -ENODEV;
+ pr_err("No device or device unplugged %d\n", retval);
+ goto exit;
+ }
+
+ /* verify that we actually have some data to write */
+ if (count == 0) {
+ dev_dbg(&dev->udev->dev, "%s : write request of 0 bytes\n",
+ __func__);
+ goto exit;
+ }
+
+ while (count > 0) {
+ add_wait_queue(&dev->write_wait, &waita);
+ set_current_state(TASK_INTERRUPTIBLE);
+ spin_lock_irqsave(&dev->buflock, flags);
+ if (!dev->out_urb_finished) {
+ spin_unlock_irqrestore(&dev->buflock, flags);
+
+ mutex_unlock(&dev->mtx);
+ if (signal_pending(current)) {
+ dev_dbg(&dev->udev->dev, "%s : interrupted\n",
+ __func__);
+ set_current_state(TASK_RUNNING);
+ retval = -EINTR;
+ goto exit_onqueue;
+ }
+ if (schedule_timeout(COMMAND_TIMEOUT) == 0) {
+ dev_dbg(&dev->udev->dev,
+ "%s - command timed out.\n", __func__);
+ retval = -ETIMEDOUT;
+ goto exit_onqueue;
+ }
+ remove_wait_queue(&dev->write_wait, &waita);
+ retval = mutex_lock_interruptible(&dev->mtx);
+ if (retval) {
+ retval = bytes_written ? bytes_written : retval;
+ goto exit_nolock;
+ }
+
+ dev_dbg(&dev->udev->dev,
+ "%s : in progress, count = %zd\n",
+ __func__, count);
+ } else {
+ spin_unlock_irqrestore(&dev->buflock, flags);
+ set_current_state(TASK_RUNNING);
+ remove_wait_queue(&dev->write_wait, &waita);
+ dev_dbg(&dev->udev->dev, "%s : sending, count = %zd\n",
+ __func__, count);
+
+ /* write the data into interrupt_out_buffer from userspace */
+ buffer_size = usb_endpoint_maxp(dev->interrupt_out_endpoint);
+ bytes_to_write = count > buffer_size ? buffer_size : count;
+ dev_dbg(&dev->udev->dev,
+ "%s : buffer_size = %zd, count = %zd, bytes_to_write = %zd\n",
+ __func__, 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 */
+ usb_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,
+ dev->interrupt_out_endpoint->bInterval);
+ dev->interrupt_out_urb->actual_length = bytes_to_write;
+ dev->out_urb_finished = 0;
+ retval = usb_submit_urb(dev->interrupt_out_urb, GFP_KERNEL);
+ if (retval < 0) {
+ dev->out_urb_finished = 1;
+ dev_err(&dev->udev->dev, "Couldn't submit "
+ "interrupt_out_urb %d\n", retval);
+ goto exit;
+ }
+
+ buffer += bytes_to_write;
+ count -= bytes_to_write;
+
+ bytes_written += bytes_to_write;
+ }
+ }
+ mutex_unlock(&dev->mtx);
+ return bytes_written;
+
+exit:
+ mutex_unlock(&dev->mtx);
+exit_nolock:
+ return retval;
+
+exit_onqueue:
+ remove_wait_queue(&dev->write_wait, &waita);
+ return retval;
+}
+
+/* file operations needed when we register this driver */
+static const struct file_operations adu_fops = {
+ .owner = THIS_MODULE,
+ .read = adu_read,
+ .write = adu_write,
+ .open = adu_open,
+ .release = adu_release,
+ .llseek = noop_llseek,
+};
+
+/*
+ * usb class driver info in order to get a minor number from the usb core,
+ * and to have the device registered with devfs and the driver core
+ */
+static struct usb_class_driver adu_class = {
+ .name = "usb/adutux%d",
+ .fops = &adu_fops,
+ .minor_base = ADU_MINOR_BASE,
+};
+
+/**
+ * adu_probe
+ *
+ * Called by the usb core when a new device is connected that it thinks
+ * this driver might be interested in.
+ */
+static int adu_probe(struct usb_interface *interface,
+ const struct usb_device_id *id)
+{
+ struct usb_device *udev = interface_to_usbdev(interface);
+ struct adu_device *dev = NULL;
+ int retval = -ENOMEM;
+ int in_end_size;
+ int out_end_size;
+ int res;
+
+ /* allocate memory for our device state and initialize it */
+ dev = kzalloc(sizeof(struct adu_device), GFP_KERNEL);
+ if (!dev)
+ return -ENOMEM;
+
+ mutex_init(&dev->mtx);
+ spin_lock_init(&dev->buflock);
+ dev->udev = udev;
+ init_waitqueue_head(&dev->read_wait);
+ init_waitqueue_head(&dev->write_wait);
+
+ res = usb_find_common_endpoints_reverse(&interface->altsetting[0],
+ NULL, NULL,
+ &dev->interrupt_in_endpoint,
+ &dev->interrupt_out_endpoint);
+ if (res) {
+ dev_err(&interface->dev, "interrupt endpoints not found\n");
+ retval = res;
+ goto error;
+ }
+
+ in_end_size = usb_endpoint_maxp(dev->interrupt_in_endpoint);
+ out_end_size = usb_endpoint_maxp(dev->interrupt_out_endpoint);
+
+ dev->read_buffer_primary = kmalloc((4 * in_end_size), GFP_KERNEL);
+ if (!dev->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)
+ 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)
+ goto error;
+
+ /* debug code prime the buffer */
+ memset(dev->interrupt_in_buffer, 'i', in_end_size);
+
+ dev->interrupt_in_urb = usb_alloc_urb(0, GFP_KERNEL);
+ if (!dev->interrupt_in_urb)
+ goto error;
+ dev->interrupt_out_buffer = kmalloc(out_end_size, GFP_KERNEL);
+ if (!dev->interrupt_out_buffer)
+ goto error;
+ dev->interrupt_out_urb = usb_alloc_urb(0, GFP_KERNEL);
+ if (!dev->interrupt_out_urb)
+ goto error;
+
+ if (!usb_string(udev, udev->descriptor.iSerialNumber, dev->serial_number,
+ sizeof(dev->serial_number))) {
+ dev_err(&interface->dev, "Could not retrieve serial number\n");
+ retval = -EIO;
+ goto error;
+ }
+ dev_dbg(&interface->dev,"serial_number=%s", dev->serial_number);
+
+ /* we can register the device now, as it is ready */
+ usb_set_intfdata(interface, dev);
+
+ retval = usb_register_dev(interface, &adu_class);
+
+ if (retval) {
+ /* something prevented us from registering this driver */
+ dev_err(&interface->dev, "Not able to get a minor for this device.\n");
+ usb_set_intfdata(interface, NULL);
+ goto error;
+ }
+
+ dev->minor = interface->minor;
+
+ /* let the user know what node this device is now attached to */
+ dev_info(&interface->dev, "ADU%d %s now attached to /dev/usb/adutux%d\n",
+ le16_to_cpu(udev->descriptor.idProduct), dev->serial_number,
+ (dev->minor - ADU_MINOR_BASE));
+
+ return 0;
+
+error:
+ adu_delete(dev);
+ return retval;
+}
+
+/**
+ * adu_disconnect
+ *
+ * Called by the usb core when the device is removed from the system.
+ */
+static void adu_disconnect(struct usb_interface *interface)
+{
+ struct adu_device *dev;
+
+ dev = usb_get_intfdata(interface);
+
+ mutex_lock(&dev->mtx); /* not interruptible */
+ dev->udev = NULL; /* poison */
+ usb_deregister_dev(interface, &adu_class);
+ mutex_unlock(&dev->mtx);
+
+ mutex_lock(&adutux_mutex);
+ usb_set_intfdata(interface, NULL);
+
+ /* if the device is not opened, then we clean up right now */
+ if (!dev->open_count)
+ adu_delete(dev);
+
+ mutex_unlock(&adutux_mutex);
+}
+
+/* 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,
+ .id_table = device_table,
+};
+
+module_usb_driver(adu_driver);
+
+MODULE_AUTHOR(DRIVER_AUTHOR);
+MODULE_DESCRIPTION(DRIVER_DESC);
+MODULE_LICENSE("GPL");