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Subject[2.4 patch] Port of adutux driver from 2.6 kernel to 2.4.
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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@gmail.com>
Tested-by: Vitaliy Ivanov <vitalivanov@gmail.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@gmail.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@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)
+ *
+ */
+
+#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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