1 files changed, 770 insertions, 0 deletions

diff --git a/drivers/usb/gadget/f_sdb.c b/drivers/usb/gadget/f_sdb.c
new file mode 100644
index 0000000..ae717f9
--- /dev/null
+++ b/drivers/usb/gadget/f_sdb.c
@@ -0,0 +1,770 @@
+/*
+ * Gadget Driver for Samsung SDB (based on Android ADB)
+ *
+ * Copyright (C) 2008 Google, Inc.
+ * Author: Mike Lockwood <lockwood@android.com>
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ */
+
+/* #define DEBUG */
+/* #define VERBOSE_DEBUG */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/poll.h>
+#include <linux/delay.h>
+#include <linux/sched.h>
+#include <linux/wait.h>
+#include <linux/err.h>
+#include <linux/interrupt.h>
+
+#include <linux/types.h>
+#include <linux/device.h>
+#include <linux/miscdevice.h>
+
+#define SDB_BULK_BUFFER_SIZE           4096
+
+/* number of tx requests to allocate */
+#define SDB_TX_REQ_MAX 4
+
+static const char sdb_shortname[] = "samsung_sdb";
+
+static DEFINE_MUTEX(sdb_lock);
+
+struct sdb_ep_descs {
+	struct usb_endpoint_descriptor	*in;
+	struct usb_endpoint_descriptor	*out;
+};
+
+struct f_sdb {
+	struct usb_function function;
+	u8	inf_id;
+
+	struct sdb_ep_descs	fs;
+	struct sdb_ep_descs hs;
+
+	struct usb_ep *ep_in;
+	struct usb_ep *ep_out;
+
+	struct list_head bulk_in_q;
+};
+
+struct sdb_dev {
+	struct f_sdb *sdb_func;
+	spinlock_t lock;
+
+	int online;
+	int error;
+
+	atomic_t read_excl;
+	atomic_t write_excl;
+	atomic_t open_excl;
+
+	struct list_head *tx_idle;
+
+	wait_queue_head_t read_wq;
+	wait_queue_head_t write_wq;
+
+	struct usb_request *rx_req;
+	int rx_done;
+};
+
+static struct usb_interface_descriptor sdb_interface_desc = {
+	.bLength                = USB_DT_INTERFACE_SIZE,
+	.bDescriptorType        = USB_DT_INTERFACE,
+	/* .bInterfaceNumber	= DYNAMIC */
+	.bNumEndpoints          = 2,
+	.bInterfaceClass        = 0xFF,
+	.bInterfaceSubClass     = 0x20,
+	.bInterfaceProtocol     = 0x02,
+	/* .iInterface			= DYNAMIC */
+};
+
+static struct usb_endpoint_descriptor sdb_fullspeed_in_desc = {
+	.bLength                = USB_DT_ENDPOINT_SIZE,
+	.bDescriptorType        = USB_DT_ENDPOINT,
+	.bEndpointAddress       = USB_DIR_IN,
+	.bmAttributes           = USB_ENDPOINT_XFER_BULK,
+	/* .wMaxPacketSize set by autoconfiguration */
+};
+
+static struct usb_endpoint_descriptor sdb_fullspeed_out_desc = {
+	.bLength                = USB_DT_ENDPOINT_SIZE,
+	.bDescriptorType        = USB_DT_ENDPOINT,
+	.bEndpointAddress       = USB_DIR_OUT,
+	.bmAttributes           = USB_ENDPOINT_XFER_BULK,
+	/* .wMaxPacketSize set by autoconfiguration */
+};
+
+static struct usb_descriptor_header *fs_sdb_descs[] = {
+	(struct usb_descriptor_header *) &sdb_interface_desc,
+	(struct usb_descriptor_header *) &sdb_fullspeed_in_desc,
+	(struct usb_descriptor_header *) &sdb_fullspeed_out_desc,
+	NULL,
+};
+
+static struct usb_endpoint_descriptor sdb_highspeed_in_desc = {
+	.bLength                = USB_DT_ENDPOINT_SIZE,
+	.bDescriptorType        = USB_DT_ENDPOINT,
+	/* bEndpointAddress copied from sdb_fullspeed_in_desc
+		during sdb_function_bind() */
+	.bmAttributes           = USB_ENDPOINT_XFER_BULK,
+	.wMaxPacketSize         = __constant_cpu_to_le16(512),
+};
+
+static struct usb_endpoint_descriptor sdb_highspeed_out_desc = {
+	.bLength                = USB_DT_ENDPOINT_SIZE,
+	.bDescriptorType        = USB_DT_ENDPOINT,
+	/* bEndpointAddress copied from sdb_fullspeed_in_desc
+		during sdb_function_bind() */
+	.bmAttributes           = USB_ENDPOINT_XFER_BULK,
+	.wMaxPacketSize         = __constant_cpu_to_le16(512),
+};
+
+static struct usb_descriptor_header *hs_sdb_descs[] = {
+	(struct usb_descriptor_header *) &sdb_interface_desc,
+	(struct usb_descriptor_header *) &sdb_highspeed_in_desc,
+	(struct usb_descriptor_header *) &sdb_highspeed_out_desc,
+	NULL,
+};
+
+/* string descriptors: */
+
+#define F_SDB_IDX	0
+
+/* static strings, in UTF-8 */
+static struct usb_string sdb_string_defs[] = {
+	[F_SDB_IDX].s = "Samsung SDB",
+	{  /* ZEROES END LIST */ },
+};
+
+static struct usb_gadget_strings sdb_string_table = {
+	.language =		0x0409,	/* en-us */
+	.strings =		sdb_string_defs,
+};
+
+static struct usb_gadget_strings *sdb_strings[] = {
+	&sdb_string_table,
+	NULL,
+};
+
+/* temporary variable used between sdb_open() and sdb_gadget_bind() */
+static struct sdb_dev *_sdb_dev;
+
+
+static inline struct f_sdb *func_to_sdb(struct usb_function *f)
+{
+	return container_of(f, struct f_sdb, function);
+}
+
+
+static struct usb_request *sdb_request_new(struct usb_ep *ep, int buffer_size)
+{
+	struct usb_request *req = usb_ep_alloc_request(ep, GFP_KERNEL);
+	if (!req)
+		return NULL;
+
+	/* now allocate buffers for the requests */
+	req->buf = kmalloc(buffer_size, GFP_KERNEL);
+	if (!req->buf) {
+		usb_ep_free_request(ep, req);
+		return NULL;
+	}
+
+	return req;
+}
+
+static void sdb_request_free(struct usb_request *req, struct usb_ep *ep)
+{
+	if (req) {
+		kfree(req->buf);
+		usb_ep_free_request(ep, req);
+	}
+}
+
+static inline int _sdb_lock(atomic_t *excl)
+{
+	if (atomic_inc_return(excl) == 1) {
+		return 0;
+	} else {
+		atomic_dec(excl);
+		return -1;
+	}
+}
+
+static inline void _sdb_unlock(atomic_t *excl)
+{
+	atomic_dec(excl);
+}
+
+/* add a request to the tail of a list */
+static void sdb_req_put(struct sdb_dev *dev, struct list_head *head,
+		struct usb_request *req)
+{
+	unsigned long flags;
+
+	if (!dev || !req)
+		return;
+
+	spin_lock_irqsave(&dev->lock, flags);
+	if (head)
+		list_add_tail(&req->list, head);
+	spin_unlock_irqrestore(&dev->lock, flags);
+}
+
+/* remove a request from the head of a list */
+static struct usb_request *sdb_req_get(struct sdb_dev *dev,
+				struct list_head *head)
+{
+	unsigned long flags;
+	struct usb_request *req;
+
+	if (!dev)
+		return NULL;
+
+	spin_lock_irqsave(&dev->lock, flags);
+	if (!head)
+		req = NULL;
+	else {
+		if (list_empty(head)) {
+			req = NULL;
+		} else {
+			req = list_first_entry(head, struct usb_request, list);
+			list_del(&req->list);
+		}
+	}
+	spin_unlock_irqrestore(&dev->lock, flags);
+	return req;
+}
+
+static void sdb_complete_in(struct usb_ep *ep, struct usb_request *req)
+{
+	struct sdb_dev *dev = _sdb_dev;
+	struct f_sdb *sdb_func = ep->driver_data;
+
+	if (req->status != 0)
+		dev->error = 1;
+
+	sdb_req_put(dev, &sdb_func->bulk_in_q, req);
+	wake_up(&dev->write_wq);
+}
+
+static void sdb_complete_out(struct usb_ep *ep, struct usb_request *req)
+{
+	struct sdb_dev *dev = _sdb_dev;
+
+	dev->rx_done = 1;
+	if (req->status != 0)
+		dev->error = 1;
+
+	wake_up(&dev->read_wq);
+}
+
+static int sdb_create_bulk_endpoints(struct f_sdb *sdb_func,
+				struct usb_endpoint_descriptor *in_desc,
+				struct usb_endpoint_descriptor *out_desc)
+{
+	struct usb_composite_dev *cdev = sdb_func->function.config->cdev;
+	struct usb_request *req;
+	struct sdb_dev *dev = _sdb_dev;
+	struct usb_ep *ep;
+	int i;
+
+	DBG(cdev, "sdb_create_bulk_endpoints dev: %p\n", dev);
+
+	ep = usb_ep_autoconfig(cdev->gadget, in_desc);
+	if (!ep) {
+		ERROR(cdev, "usb_ep_autoconfig for ep_in failed\n");
+		return -ENODEV;
+	}
+	DBG(cdev, "usb_ep_autoconfig for ep_in got %s\n", ep->name);
+	ep->driver_data = cdev;		/* claim the endpoint */
+	sdb_func->ep_in = ep;
+
+	ep = usb_ep_autoconfig(cdev->gadget, out_desc);
+	if (!ep) {
+		ERROR(cdev, "usb_ep_autoconfig for ep_out failed\n");
+		return -ENODEV;
+	}
+	DBG(cdev, "usb_ep_autoconfig for sdb ep_out got %s\n", ep->name);
+	ep->driver_data = cdev;		/* claim the endpoint */
+	sdb_func->ep_out = ep;
+
+	/* now allocate requests for our endpoints */
+	req = sdb_request_new(sdb_func->ep_out, SDB_BULK_BUFFER_SIZE);
+	if (!req)
+		return -ENOMEM;
+	req->complete = sdb_complete_out;
+	dev->rx_req = req;
+
+	for (i = 0; i < SDB_TX_REQ_MAX; i++) {
+		req = sdb_request_new(sdb_func->ep_in, SDB_BULK_BUFFER_SIZE);
+		if (!req)
+			goto fail;
+		req->complete = sdb_complete_in;
+		sdb_req_put(dev, &sdb_func->bulk_in_q, req);
+	}
+
+	return 0;
+
+fail:
+	while (!!(req = sdb_req_get(dev, &sdb_func->bulk_in_q)))
+		sdb_request_free(req, sdb_func->ep_in);
+
+	sdb_request_free(dev->rx_req, sdb_func->ep_out);
+	dev->rx_req = NULL;
+
+	if (sdb_func->ep_in)
+		sdb_func->ep_in->driver_data = NULL;
+	if (sdb_func->ep_out)
+		sdb_func->ep_out->driver_data = NULL;
+
+	printk(KERN_ERR "sdb_bind() could not allocate requests\n");
+	return -ENOMEM;
+}
+
+static ssize_t sdb_read(struct file *fp, char __user *buf,
+				size_t count, loff_t *pos)
+{
+	struct sdb_dev *dev = fp->private_data;
+	int r = count, xfer;
+	int ret;
+
+	if (count > SDB_BULK_BUFFER_SIZE)
+		return -EINVAL;
+
+	if (_sdb_lock(&dev->read_excl))
+		return -EBUSY;
+
+	/* we will block until we're online */
+	while (!(dev->online || dev->error)) {
+		ret = wait_event_interruptible(dev->read_wq,
+				(dev->online || dev->error));
+		if (ret < 0) {
+			_sdb_unlock(&dev->read_excl);
+			return ret;
+		}
+	}
+	if (dev->error) {
+		r = -EIO;
+		goto done;
+	}
+
+requeue_req:
+	/* queue a request */
+	mutex_lock(&sdb_lock);
+	if (!dev->sdb_func || !dev->rx_req)
+		ret = -ENODEV;
+	else {
+		dev->rx_req->length = count;
+		dev->rx_done = 0;
+		ret = usb_ep_queue(dev->sdb_func->ep_out,
+				dev->rx_req, GFP_ATOMIC);
+	}
+	mutex_unlock(&sdb_lock);
+
+	if (ret < 0) {
+		r = -EIO;
+		dev->error = 1;
+		goto done;
+	}
+
+	/* wait for a request to complete */
+	ret = wait_event_interruptible(dev->read_wq, dev->rx_done);
+	if (ret < 0) {
+		dev->error = 1;
+		r = ret;
+		goto done;
+	}
+	if (!dev->error) {
+		/* If we got a 0-len packet, throw it back and try again. */
+		if (dev->rx_req->actual == 0)
+			goto requeue_req;
+
+		mutex_lock(&sdb_lock);
+		if (!dev->sdb_func || !dev->rx_req)
+			r = -ENODEV;
+		else {
+			xfer = (dev->rx_req->actual < count)
+					? dev->rx_req->actual : count;
+			if (copy_to_user(buf, dev->rx_req->buf, xfer))
+				r = -EFAULT;
+		}
+		mutex_unlock(&sdb_lock);
+	} else
+		r = -EIO;
+
+done:
+	_sdb_unlock(&dev->read_excl);
+	return r;
+}
+
+static ssize_t sdb_write(struct file *fp, const char __user *buf,
+				 size_t count, loff_t *pos)
+{
+	struct sdb_dev *dev = fp->private_data;
+	struct usb_request *req = 0;
+	int r = count, xfer;
+	int ret;
+
+	if (_sdb_lock(&dev->write_excl))
+		return -EBUSY;
+
+	while (count > 0) {
+		if (dev->error) {
+			r = -EIO;
+			break;
+		}
+
+		/* get an idle tx request to use */
+		req = 0;
+		ret = wait_event_interruptible(dev->write_wq,
+				(!!(req = sdb_req_get(dev, dev->tx_idle))
+				 || dev->error));
+
+		if (ret < 0) {
+			r = ret;
+			break;
+		}
+
+		if (req != 0) {
+			if (count > SDB_BULK_BUFFER_SIZE)
+				xfer = SDB_BULK_BUFFER_SIZE;
+			else
+				xfer = count;
+
+			mutex_lock(&sdb_lock);
+			if (!dev->sdb_func) {
+				mutex_unlock(&sdb_lock);
+				r = -ENODEV;
+				break;
+			} else if (copy_from_user(req->buf, buf, xfer)) {
+				mutex_unlock(&sdb_lock);
+				r = -EFAULT;
+				break;
+			}
+
+			req->length = xfer;
+			ret = usb_ep_queue(dev->sdb_func->ep_in,
+					req, GFP_ATOMIC);
+			mutex_unlock(&sdb_lock);
+
+			if (ret < 0) {
+				dev->error = 1;
+				r = -EIO;
+				break;
+			}
+
+			buf += xfer;
+			count -= xfer;
+
+			/* zero this so we don't try to free it on error exit */
+			req = 0;
+		}
+	}
+
+	if (req)
+		sdb_req_put(dev, dev->tx_idle, req);
+
+	_sdb_unlock(&dev->write_excl);
+	return r;
+}
+
+static int sdb_open(struct inode *ip, struct file *fp)
+{
+	printk(KERN_INFO "sdb_open\n");
+	if (_sdb_lock(&_sdb_dev->open_excl))
+		return -EBUSY;
+
+	fp->private_data = _sdb_dev;
+
+	/* clear the error latch */
+	_sdb_dev->error = 0;
+
+	return 0;
+}
+
+static int sdb_release(struct inode *ip, struct file *fp)
+{
+	printk(KERN_INFO "sdb_release\n");
+
+	if (_sdb_dev != NULL)
+		_sdb_unlock(&_sdb_dev->open_excl);
+
+	return 0;
+}
+
+/* file operations for SDB device /dev/samsung_sdb */
+static const struct file_operations sdb_fops = {
+	.owner = THIS_MODULE,
+	.read = sdb_read,
+	.write = sdb_write,
+	.open = sdb_open,
+	.release = sdb_release,
+};
+
+static struct miscdevice sdb_device = {
+	.minor = MISC_DYNAMIC_MINOR,
+	.name = sdb_shortname,
+	.fops = &sdb_fops,
+};
+
+static int
+sdb_function_bind(struct usb_configuration *c, struct usb_function *f)
+{
+	struct usb_composite_dev *cdev = c->cdev;
+	struct f_sdb *sdb_func = func_to_sdb(f);
+	int			id;
+	int			ret;
+
+	DBG(cdev, "sdb_function_bind sdb_func: %p\n", sdb_func);
+
+	/* allocate interface ID(s) */
+	id = usb_interface_id(c, f);
+	if (id < 0)
+		return id;
+
+	sdb_func->inf_id = id;
+	sdb_interface_desc.bInterfaceNumber = id;
+
+	/* allocate endpoints */
+	ret = sdb_create_bulk_endpoints(sdb_func, &sdb_fullspeed_in_desc,
+			&sdb_fullspeed_out_desc);
+	if (ret)
+		return ret;
+
+	f->descriptors = usb_copy_descriptors(fs_sdb_descs);
+	if (!f->descriptors)
+		goto desc_alloc_fail;
+
+	sdb_func->fs.in = usb_find_endpoint(fs_sdb_descs, f->descriptors,
+					&sdb_fullspeed_in_desc);
+	sdb_func->fs.out = usb_find_endpoint(fs_sdb_descs, f->descriptors,
+					&sdb_fullspeed_out_desc);
+
+	/* support high speed hardware */
+	if (gadget_is_dualspeed(cdev->gadget)) {
+		sdb_highspeed_in_desc.bEndpointAddress =
+			sdb_fullspeed_in_desc.bEndpointAddress;
+		sdb_highspeed_out_desc.bEndpointAddress =
+			sdb_fullspeed_out_desc.bEndpointAddress;
+
+		f->hs_descriptors = usb_copy_descriptors(hs_sdb_descs);
+		if (!f->hs_descriptors)
+			goto desc_alloc_fail;
+
+		sdb_func->hs.in = usb_find_endpoint(hs_sdb_descs,
+				f->hs_descriptors, &sdb_highspeed_in_desc);
+		sdb_func->hs.out = usb_find_endpoint(hs_sdb_descs,
+				f->hs_descriptors, &sdb_highspeed_out_desc);
+	}
+
+	return 0;
+
+desc_alloc_fail:
+	if (f->descriptors)
+		usb_free_descriptors(f->descriptors);
+
+	return -ENOMEM;
+}
+
+static void
+sdb_function_unbind(struct usb_configuration *c, struct usb_function *f)
+{
+	struct sdb_dev *dev = _sdb_dev;
+	struct f_sdb *sdb_func = func_to_sdb(f);
+	struct usb_request *req;
+
+	dev->online = 0;
+	dev->error = 1;
+
+	if (gadget_is_dualspeed(c->cdev->gadget))
+		usb_free_descriptors(f->hs_descriptors);
+	usb_free_descriptors(f->descriptors);
+
+	mutex_lock(&sdb_lock);
+
+	while (!!(req = sdb_req_get(dev, &sdb_func->bulk_in_q)))
+		sdb_request_free(req, sdb_func->ep_in);
+
+	sdb_request_free(dev->rx_req, sdb_func->ep_out);
+
+	kfree(sdb_func);
+	dev->sdb_func = NULL;
+	dev->rx_req = NULL;
+
+	mutex_unlock(&sdb_lock);
+
+	wake_up(&dev->read_wq);
+	wake_up(&dev->write_wq);
+}
+
+static int sdb_function_set_alt(struct usb_function *f,
+		unsigned intf, unsigned alt)
+{
+	struct f_sdb *sdb_func = func_to_sdb(f);
+	struct usb_composite_dev *cdev = f->config->cdev;
+	struct sdb_dev *dev = _sdb_dev;
+	int ret;
+
+	if (sdb_func->inf_id != intf) {
+		printk(KERN_ERR "sdb_function_set_alt error wrong intf:%d alt:%d\n",
+						intf, alt);
+		return -EINVAL;
+	}
+
+	if (sdb_func->ep_in->driver_data)
+		usb_ep_disable(sdb_func->ep_in);
+	ret = usb_ep_enable(sdb_func->ep_in,
+			ep_choose(cdev->gadget,
+				sdb_func->hs.in, sdb_func->fs.in));
+	if (ret) {
+		printk(KERN_ERR "error, usb_ep_enable for sdb ep_in\n");
+		return ret;
+	}
+	sdb_func->ep_in->driver_data = sdb_func;
+
+	if (sdb_func->ep_out->driver_data)
+		usb_ep_disable(sdb_func->ep_out);
+	ret = usb_ep_enable(sdb_func->ep_out,
+			ep_choose(cdev->gadget,
+				sdb_func->hs.out, sdb_func->fs.out));
+	if (ret) {
+		usb_ep_disable(sdb_func->ep_in);
+		sdb_func->ep_in->driver_data = NULL;
+		printk(KERN_ERR "error, usb_ep_enable for sdb ep_out\n");
+		return ret;
+	}
+	sdb_func->ep_out->driver_data = sdb_func;
+
+	dev->tx_idle = &sdb_func->bulk_in_q;
+	dev->sdb_func = sdb_func;
+	dev->online = 1;
+
+	/* readers may be blocked waiting for us to go online */
+	wake_up(&dev->read_wq);
+	return 0;
+}
+
+static void sdb_function_disable(struct usb_function *f)
+{
+	struct sdb_dev *dev = _sdb_dev;
+	struct f_sdb *sdb_func = func_to_sdb(f);
+
+	dev->online = 0;
+	dev->error = 1;
+
+	spin_lock(&dev->lock);
+	dev->tx_idle = NULL;
+	spin_unlock(&dev->lock);
+
+	usb_ep_disable(sdb_func->ep_in);
+	sdb_func->ep_in->driver_data = NULL;
+
+	usb_ep_disable(sdb_func->ep_out);
+	sdb_func->ep_out->driver_data = NULL;
+
+	/* readers may be blocked waiting for us to go online */
+	wake_up(&dev->read_wq);
+	wake_up(&dev->write_wq);
+}
+
+static int sdb_setup(struct usb_composite_dev *cdev)
+{
+	struct sdb_dev *dev;
+	int ret;
+
+	printk(KERN_INFO "sdb_bind_config\n");
+
+	dev = kzalloc(sizeof(*dev), GFP_KERNEL);
+	if (!dev)
+		return -ENOMEM;
+
+	if (sdb_string_defs[F_SDB_IDX].id == 0) {
+		ret = usb_string_id(cdev);
+		if (ret < 0) {
+			kfree(dev);
+			return ret;
+		}
+		sdb_string_defs[F_SDB_IDX].id = ret;
+		sdb_interface_desc.iInterface = ret;
+	}
+
+	spin_lock_init(&dev->lock);
+
+	init_waitqueue_head(&dev->read_wq);
+	init_waitqueue_head(&dev->write_wq);
+
+	atomic_set(&dev->open_excl, 0);
+	atomic_set(&dev->read_excl, 0);
+	atomic_set(&dev->write_excl, 0);
+
+
+	/* _sdb_dev must be set before calling usb_gadget_register_driver */
+	_sdb_dev = dev;
+
+	ret = misc_register(&sdb_device);
+	if (ret)
+		goto err1;
+
+	return 0;
+
+err1:
+	kfree(dev);
+	_sdb_dev = NULL;
+	printk(KERN_ERR "sdb gadget driver failed to initialize\n");
+	return ret;
+}
+
+static int sdb_bind_config(struct usb_configuration *c)
+{
+	int ret;
+	struct f_sdb *sdb_func;
+
+	if (!_sdb_dev) {
+		printk(KERN_ERR "Error There is no _sdb_dev!!\n");
+		return -ENODEV;
+	}
+
+	sdb_func = kzalloc(sizeof(*sdb_func), GFP_KERNEL);
+	if (!sdb_func) {
+		printk(KERN_ERR "sdb_func memory alloc failed !!!\n");
+		return -ENOMEM;
+	}
+
+	INIT_LIST_HEAD(&sdb_func->bulk_in_q);
+
+	sdb_func->function.name = "sdb";
+	sdb_func->function.strings = sdb_strings;
+	sdb_func->function.bind = sdb_function_bind;
+	sdb_func->function.unbind = sdb_function_unbind;
+	sdb_func->function.set_alt = sdb_function_set_alt;
+	sdb_func->function.disable = sdb_function_disable;
+
+	ret = usb_add_function(c, &sdb_func->function);
+	if (ret)
+		printk(KERN_ERR "Error in usb_add_function failed for sdb\n");
+
+	return ret;
+}
+
+static void sdb_cleanup(void)
+{
+	struct sdb_dev	*dev = _sdb_dev;
+
+	misc_deregister(&sdb_device);
+
+	if (!dev)
+		return;
+	_sdb_dev = NULL;
+	kfree(dev);
+}