[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / usb / usb-skeleton.c

/*
 * USB Skeleton driver - 2.0
 *
 * Copyright (C) 2001-2004 Greg Kroah-Hartman (greg@kroah.com)
 *
 *	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, version 2.
 *
 * This driver is based on the 2.6.3 version of drivers/usb/usb-skeleton.c 
 * but has been rewritten to be easy to read and use, as no locks are now
 * needed anymore.
 *
 */

#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/kref.h>
#include <asm/uaccess.h>
#include <linux/usb.h>


/* Define these values to match your devices */
#define USB_SKEL_VENDOR_ID	0xfff0
#define USB_SKEL_PRODUCT_ID	0xfff0

/* table of devices that work with this driver */
static struct usb_device_id skel_table [] = {
	{ USB_DEVICE(USB_SKEL_VENDOR_ID, USB_SKEL_PRODUCT_ID) },
	{ }					/* Terminating entry */
};
MODULE_DEVICE_TABLE (usb, skel_table);


/* Get a minor range for your devices from the usb maintainer */
#define USB_SKEL_MINOR_BASE	192

/* our private defines. if this grows any larger, use your own .h file */
#define MAX_TRANSFER		( PAGE_SIZE - 512 )
#define WRITES_IN_FLIGHT	8

/* Structure to hold all of our device specific stuff */
struct usb_skel {
	struct usb_device *	udev;			/* the usb device for this device */
	struct usb_interface *	interface;		/* the interface for this device */
	struct semaphore	limit_sem;		/* limiting the number of writes in progress */
	unsigned char *		bulk_in_buffer;		/* the buffer to receive data */
	size_t			bulk_in_size;		/* the size of the receive buffer */
	__u8			bulk_in_endpointAddr;	/* the address of the bulk in endpoint */
	__u8			bulk_out_endpointAddr;	/* the address of the bulk out endpoint */
	struct kref		kref;
};
#define to_skel_dev(d) container_of(d, struct usb_skel, kref)

static struct usb_driver skel_driver;

static void skel_delete(struct kref *kref)
{	
	struct usb_skel *dev = to_skel_dev(kref);

	usb_put_dev(dev->udev);
	kfree (dev->bulk_in_buffer);
	kfree (dev);
}

static int skel_open(struct inode *inode, struct file *file)
{
	struct usb_skel *dev;
	struct usb_interface *interface;
	int subminor;
	int retval = 0;

	subminor = iminor(inode);

	interface = usb_find_interface(&skel_driver, subminor);
	if (!interface) {
		err ("%s - error, can't find device for minor %d",
		     __FUNCTION__, subminor);
		retval = -ENODEV;
		goto exit;
	}

	dev = usb_get_intfdata(interface);
	if (!dev) {
		retval = -ENODEV;
		goto exit;
	}

	/* increment our usage count for the device */
	kref_get(&dev->kref);

	/* save our object in the file's private structure */
	file->private_data = dev;

exit:
	return retval;
}

static int skel_release(struct inode *inode, struct file *file)
{
	struct usb_skel *dev;

	dev = (struct usb_skel *)file->private_data;
	if (dev == NULL)
		return -ENODEV;

	/* decrement the count on our device */
	kref_put(&dev->kref, skel_delete);
	return 0;
}

static ssize_t skel_read(struct file *file, char *buffer, size_t count, loff_t *ppos)
{
	struct usb_skel *dev;
	int retval = 0;
	int bytes_read;

	dev = (struct usb_skel *)file->private_data;
	
	/* do a blocking bulk read to get data from the device */
	retval = usb_bulk_msg(dev->udev,
			      usb_rcvbulkpipe(dev->udev, dev->bulk_in_endpointAddr),
			      dev->bulk_in_buffer,
			      min(dev->bulk_in_size, count),
			      &bytes_read, 10000);

	/* if the read was successful, copy the data to userspace */
	if (!retval) {
		if (copy_to_user(buffer, dev->bulk_in_buffer, bytes_read))
			retval = -EFAULT;
		else
			retval = bytes_read;
	}

	return retval;
}

static void skel_write_bulk_callback(struct urb *urb, struct pt_regs *regs)
{
	struct usb_skel *dev;

	dev = (struct usb_skel *)urb->context;

	/* sync/async unlink faults aren't errors */
	if (urb->status && 
	    !(urb->status == -ENOENT || 
	      urb->status == -ECONNRESET ||
	      urb->status == -ESHUTDOWN)) {
		dbg("%s - nonzero write bulk status received: %d",
		    __FUNCTION__, urb->status);
	}

	/* free up our allocated buffer */
	usb_buffer_free(urb->dev, urb->transfer_buffer_length, 
			urb->transfer_buffer, urb->transfer_dma);
	up(&dev->limit_sem);
}

static ssize_t skel_write(struct file *file, const char *user_buffer, size_t count, loff_t *ppos)
{
	struct usb_skel *dev;
	int retval = 0;
	struct urb *urb = NULL;
	char *buf = NULL;
	size_t writesize = min(count, (size_t)MAX_TRANSFER);

	dev = (struct usb_skel *)file->private_data;

	/* verify that we actually have some data to write */
	if (count == 0)
		goto exit;

	/* limit the number of URBs in flight to stop a user from using up all RAM */
	if (down_interruptible(&dev->limit_sem)) {
		retval = -ERESTARTSYS;
		goto exit;
	}

	/* create a urb, and a buffer for it, and copy the data to the urb */
	urb = usb_alloc_urb(0, GFP_KERNEL);
	if (!urb) {
		retval = -ENOMEM;
		goto error;
	}

	buf = usb_buffer_alloc(dev->udev, writesize, GFP_KERNEL, &urb->transfer_dma);
	if (!buf) {
		retval = -ENOMEM;
		goto error;
	}

	if (copy_from_user(buf, user_buffer, writesize)) {
		retval = -EFAULT;
		goto error;
	}

	/* initialize the urb properly */
	usb_fill_bulk_urb(urb, dev->udev,
			  usb_sndbulkpipe(dev->udev, dev->bulk_out_endpointAddr),
			  buf, writesize, skel_write_bulk_callback, dev);
	urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;

	/* send the data out the bulk port */
	retval = usb_submit_urb(urb, GFP_KERNEL);
	if (retval) {
		err("%s - failed submitting write urb, error %d", __FUNCTION__, retval);
		goto error;
	}

	/* release our reference to this urb, the USB core will eventually free it entirely */
	usb_free_urb(urb);

exit:
	return writesize;

error:
	usb_buffer_free(dev->udev, writesize, buf, urb->transfer_dma);
	usb_free_urb(urb);
	up(&dev->limit_sem);
	return retval;
}

static struct file_operations skel_fops = {
	.owner =	THIS_MODULE,
	.read =		skel_read,
	.write =	skel_write,
	.open =		skel_open,
	.release =	skel_release,
};

/* 
 * usb class driver info in order to get a minor number from the usb core,
 * and to have the device registered with the driver core
 */
static struct usb_class_driver skel_class = {
	.name =		"skel%d",
	.fops =		&skel_fops,
	.minor_base =	USB_SKEL_MINOR_BASE,
};

static int skel_probe(struct usb_interface *interface, const struct usb_device_id *id)
{
	struct usb_skel *dev = NULL;
	struct usb_host_interface *iface_desc;
	struct usb_endpoint_descriptor *endpoint;
	size_t buffer_size;
	int i;
	int retval = -ENOMEM;

	/* allocate memory for our device state and initialize it */
	dev = kzalloc(sizeof(*dev), GFP_KERNEL);
	if (dev == NULL) {
		err("Out of memory");
		goto error;
	}
	kref_init(&dev->kref);
	sema_init(&dev->limit_sem, WRITES_IN_FLIGHT);

	dev->udev = usb_get_dev(interface_to_usbdev(interface));
	dev->interface = interface;

	/* set up the endpoint information */
	/* use only the first bulk-in and bulk-out endpoints */
	iface_desc = interface->cur_altsetting;
	for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
		endpoint = &iface_desc->endpoint[i].desc;

		if (!dev->bulk_in_endpointAddr &&
		    ((endpoint->bEndpointAddress & USB_ENDPOINT_DIR_MASK)
					== USB_DIR_IN) &&
		    ((endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
					== USB_ENDPOINT_XFER_BULK)) {
			/* we found a bulk in endpoint */
			buffer_size = le16_to_cpu(endpoint->wMaxPacketSize);
			dev->bulk_in_size = buffer_size;
			dev->bulk_in_endpointAddr = endpoint->bEndpointAddress;
			dev->bulk_in_buffer = kmalloc(buffer_size, GFP_KERNEL);
			if (!dev->bulk_in_buffer) {
				err("Could not allocate bulk_in_buffer");
				goto error;
			}
		}

		if (!dev->bulk_out_endpointAddr &&
		    ((endpoint->bEndpointAddress & USB_ENDPOINT_DIR_MASK)
					== USB_DIR_OUT) &&
		    ((endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
					== USB_ENDPOINT_XFER_BULK)) {
			/* we found a bulk out endpoint */
			dev->bulk_out_endpointAddr = endpoint->bEndpointAddress;
		}
	}
	if (!(dev->bulk_in_endpointAddr && dev->bulk_out_endpointAddr)) {
		err("Could not find both bulk-in and bulk-out endpoints");
		goto error;
	}

	/* save our data pointer in this interface device */
	usb_set_intfdata(interface, dev);

	/* we can register the device now, as it is ready */
	retval = usb_register_dev(interface, &skel_class);
	if (retval) {
		/* something prevented us from registering this driver */
		err("Not able to get a minor for this device.");
		usb_set_intfdata(interface, NULL);
		goto error;
	}

	/* let the user know what node this device is now attached to */
	info("USB Skeleton device now attached to USBSkel-%d", interface->minor);
	return 0;

error:
	if (dev)
		kref_put(&dev->kref, skel_delete);
	return retval;
}

static void skel_disconnect(struct usb_interface *interface)
{
	struct usb_skel *dev;
	int minor = interface->minor;

	/* prevent skel_open() from racing skel_disconnect() */
	lock_kernel();

	dev = usb_get_intfdata(interface);
	usb_set_intfdata(interface, NULL);

	/* give back our minor */
	usb_deregister_dev(interface, &skel_class);

	unlock_kernel();

	/* decrement our usage count */
	kref_put(&dev->kref, skel_delete);

	info("USB Skeleton #%d now disconnected", minor);
}

static struct usb_driver skel_driver = {
	.name =		"skeleton",
	.probe =	skel_probe,
	.disconnect =	skel_disconnect,
	.id_table =	skel_table,
};

static int __init usb_skel_init(void)
{
	int result;

	/* register this driver with the USB subsystem */
	result = usb_register(&skel_driver);
	if (result)
		err("usb_register failed. Error number %d", result);

	return result;
}

static void __exit usb_skel_exit(void)
{
	/* deregister this driver with the USB subsystem */
	usb_deregister(&skel_driver);
}

module_init (usb_skel_init);
module_exit (usb_skel_exit);

MODULE_LICENSE("GPL");
Commit	Line	Data
1da177e4 LT	1	/*
	2	* USB Skeleton driver - 2.0
	3	*
	4	* Copyright (C) 2001-2004 Greg Kroah-Hartman (greg@kroah.com)
	5	*
	6	* This program is free software; you can redistribute it and/or
	7	* modify it under the terms of the GNU General Public License as
	8	* published by the Free Software Foundation, version 2.
	9	*
	10	* This driver is based on the 2.6.3 version of drivers/usb/usb-skeleton.c
	11	* but has been rewritten to be easy to read and use, as no locks are now
	12	* needed anymore.
	13	*
	14	*/
	15
1da177e4 LT	16	#include <linux/kernel.h>
	17	#include <linux/errno.h>
	18	#include <linux/init.h>
	19	#include <linux/slab.h>
	20	#include <linux/module.h>
	21	#include <linux/kref.h>
	22	#include <asm/uaccess.h>
	23	#include <linux/usb.h>
	24
	25
	26	/* Define these values to match your devices */
	27	#define USB_SKEL_VENDOR_ID 0xfff0
	28	#define USB_SKEL_PRODUCT_ID 0xfff0
	29
	30	/* table of devices that work with this driver */
	31	static struct usb_device_id skel_table [] = {
	32	{ USB_DEVICE(USB_SKEL_VENDOR_ID, USB_SKEL_PRODUCT_ID) },
	33	{ } /* Terminating entry */
	34	};
	35	MODULE_DEVICE_TABLE (usb, skel_table);
	36
	37
	38	/* Get a minor range for your devices from the usb maintainer */
	39	#define USB_SKEL_MINOR_BASE 192
	40
ff906518 ON	41	/* our private defines. if this grows any larger, use your own .h file */
	42	#define MAX_TRANSFER ( PAGE_SIZE - 512 )
	43	#define WRITES_IN_FLIGHT 8
	44
1da177e4 LT	45	/* Structure to hold all of our device specific stuff */
	46	struct usb_skel {
	47	struct usb_device * udev; /* the usb device for this device */
	48	struct usb_interface * interface; /* the interface for this device */
ff906518	49	struct semaphore limit_sem; /* limiting the number of writes in progress */
1da177e4 LT	50	unsigned char * bulk_in_buffer; /* the buffer to receive data */
	51	size_t bulk_in_size; /* the size of the receive buffer */
	52	__u8 bulk_in_endpointAddr; /* the address of the bulk in endpoint */
	53	__u8 bulk_out_endpointAddr; /* the address of the bulk out endpoint */
	54	struct kref kref;
	55	};
	56	#define to_skel_dev(d) container_of(d, struct usb_skel, kref)
	57
	58	static struct usb_driver skel_driver;
	59
	60	static void skel_delete(struct kref *kref)
	61	{
	62	struct usb_skel *dev = to_skel_dev(kref);
	63
	64	usb_put_dev(dev->udev);
	65	kfree (dev->bulk_in_buffer);
	66	kfree (dev);
	67	}
	68
	69	static int skel_open(struct inode inode, struct file file)
	70	{
	71	struct usb_skel *dev;
	72	struct usb_interface *interface;
	73	int subminor;
	74	int retval = 0;
	75
	76	subminor = iminor(inode);
	77
	78	interface = usb_find_interface(&skel_driver, subminor);
	79	if (!interface) {
	80	err ("%s - error, can't find device for minor %d",
	81	__FUNCTION__, subminor);
	82	retval = -ENODEV;
	83	goto exit;
	84	}
	85
	86	dev = usb_get_intfdata(interface);
	87	if (!dev) {
	88	retval = -ENODEV;
	89	goto exit;
	90	}
	91
	92	/* increment our usage count for the device */
	93	kref_get(&dev->kref);
	94
	95	/* save our object in the file's private structure */
	96	file->private_data = dev;
	97
	98	exit:
	99	return retval;
	100	}
	101
	102	static int skel_release(struct inode inode, struct file file)
	103	{
	104	struct usb_skel *dev;
	105
	106	dev = (struct usb_skel *)file->private_data;
	107	if (dev == NULL)
	108	return -ENODEV;
	109
	110	/* decrement the count on our device */
	111	kref_put(&dev->kref, skel_delete);
	112	return 0;
	113	}
114
115	static ssize_t skel_read(struct file file, char buffer, size_t count, loff_t *ppos)
116	{
117	struct usb_skel *dev;
118	int retval = 0;
119	int bytes_read;
120
121	dev = (struct usb_skel *)file->private_data;
122
123	/* do a blocking bulk read to get data from the device */
124	retval = usb_bulk_msg(dev->udev,
125	usb_rcvbulkpipe(dev->udev, dev->bulk_in_endpointAddr),
126	dev->bulk_in_buffer,
127	min(dev->bulk_in_size, count),
128	&bytes_read, 10000);
129
130	/* if the read was successful, copy the data to userspace */
131	if (!retval) {
132	if (copy_to_user(buffer, dev->bulk_in_buffer, bytes_read))
133	retval = -EFAULT;
134	else
135	retval = bytes_read;
136	}
137
138	return retval;
139	}
140
141	static void skel_write_bulk_callback(struct urb urb, struct pt_regs regs)
142	{
143	struct usb_skel *dev;
144
145	dev = (struct usb_skel *)urb->context;
146
147	/* sync/async unlink faults aren't errors */
148	if (urb->status &&
149	!(urb->status == -ENOENT \|\|
150	urb->status == -ECONNRESET \|\|
151	urb->status == -ESHUTDOWN)) {
152	dbg("%s - nonzero write bulk status received: %d",
153	__FUNCTION__, urb->status);
154	}
155
156	/* free up our allocated buffer */
157	usb_buffer_free(urb->dev, urb->transfer_buffer_length,
158	urb->transfer_buffer, urb->transfer_dma);
ff906518	159	up(&dev->limit_sem);
1da177e4 LT	160	}
	161
	162	static ssize_t skel_write(struct file file, const char user_buffer, size_t count, loff_t *ppos)
	163	{
	164	struct usb_skel *dev;
	165	int retval = 0;
	166	struct urb *urb = NULL;
	167	char *buf = NULL;
c8dd7709	168	size_t writesize = min(count, (size_t)MAX_TRANSFER);
1da177e4 LT	169
	170	dev = (struct usb_skel *)file->private_data;
	171
	172	/* verify that we actually have some data to write */
	173	if (count == 0)
	174	goto exit;
	175
ff906518	176	/* limit the number of URBs in flight to stop a user from using up all RAM */
c8dd7709 SB	177	if (down_interruptible(&dev->limit_sem)) {
	178	retval = -ERESTARTSYS;
	179	goto exit;
	180	}
ff906518	181
1da177e4 LT	182	/* create a urb, and a buffer for it, and copy the data to the urb */
	183	urb = usb_alloc_urb(0, GFP_KERNEL);
	184	if (!urb) {
	185	retval = -ENOMEM;
	186	goto error;
	187	}
	188
ff906518	189	buf = usb_buffer_alloc(dev->udev, writesize, GFP_KERNEL, &urb->transfer_dma);
1da177e4 LT	190	if (!buf) {
	191	retval = -ENOMEM;
	192	goto error;
	193	}
	194
ff906518	195	if (copy_from_user(buf, user_buffer, writesize)) {
1da177e4 LT	196	retval = -EFAULT;
	197	goto error;
	198	}
	199
	200	/* initialize the urb properly */
	201	usb_fill_bulk_urb(urb, dev->udev,
	202	usb_sndbulkpipe(dev->udev, dev->bulk_out_endpointAddr),
ff906518	203	buf, writesize, skel_write_bulk_callback, dev);
1da177e4 LT	204	urb->transfer_flags \|= URB_NO_TRANSFER_DMA_MAP;
	205
	206	/* send the data out the bulk port */
	207	retval = usb_submit_urb(urb, GFP_KERNEL);
	208	if (retval) {
	209	err("%s - failed submitting write urb, error %d", __FUNCTION__, retval);
	210	goto error;
	211	}
	212
	213	/* release our reference to this urb, the USB core will eventually free it entirely */
	214	usb_free_urb(urb);
	215
	216	exit:
ff906518	217	return writesize;
1da177e4 LT	218
1da177e4 LT	219	error:
ff906518	220	usb_buffer_free(dev->udev, writesize, buf, urb->transfer_dma);
1da177e4	221	usb_free_urb(urb);
ff906518	222	up(&dev->limit_sem);
1da177e4 LT	223	return retval;
	224	}
	225
	226	static struct file_operations skel_fops = {
	227	.owner = THIS_MODULE,
	228	.read = skel_read,
	229	.write = skel_write,
	230	.open = skel_open,
	231	.release = skel_release,
	232	};
	233
	234	/*
	235	* usb class driver info in order to get a minor number from the usb core,
595b14cb	236	* and to have the device registered with the driver core
1da177e4 LT	237	*/
1da177e4 LT	238	static struct usb_class_driver skel_class = {
d6e5bcf4	239	.name = "skel%d",
1da177e4	240	.fops = &skel_fops,
1da177e4 LT	241	.minor_base = USB_SKEL_MINOR_BASE,
	242	};
	243
	244	static int skel_probe(struct usb_interface interface, const struct usb_device_id id)
	245	{
	246	struct usb_skel *dev = NULL;
	247	struct usb_host_interface *iface_desc;
	248	struct usb_endpoint_descriptor *endpoint;
	249	size_t buffer_size;
	250	int i;
	251	int retval = -ENOMEM;
	252
	253	/* allocate memory for our device state and initialize it */
ff906518	254	dev = kzalloc(sizeof(*dev), GFP_KERNEL);
1da177e4 LT	255	if (dev == NULL) {
	256	err("Out of memory");
	257	goto error;
	258	}
1da177e4	259	kref_init(&dev->kref);
ff906518	260	sema_init(&dev->limit_sem, WRITES_IN_FLIGHT);
1da177e4 LT	261
	262	dev->udev = usb_get_dev(interface_to_usbdev(interface));
	263	dev->interface = interface;
	264
	265	/* set up the endpoint information */
	266	/* use only the first bulk-in and bulk-out endpoints */
	267	iface_desc = interface->cur_altsetting;
	268	for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
	269	endpoint = &iface_desc->endpoint[i].desc;
	270
	271	if (!dev->bulk_in_endpointAddr &&
6b216df8 CC	272	((endpoint->bEndpointAddress & USB_ENDPOINT_DIR_MASK)
6b216df8 CC	273	== USB_DIR_IN) &&
1da177e4 LT	274	((endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
	275	== USB_ENDPOINT_XFER_BULK)) {
	276	/* we found a bulk in endpoint */
	277	buffer_size = le16_to_cpu(endpoint->wMaxPacketSize);
	278	dev->bulk_in_size = buffer_size;
	279	dev->bulk_in_endpointAddr = endpoint->bEndpointAddress;
	280	dev->bulk_in_buffer = kmalloc(buffer_size, GFP_KERNEL);
	281	if (!dev->bulk_in_buffer) {
	282	err("Could not allocate bulk_in_buffer");
	283	goto error;
	284	}
	285	}
	286
	287	if (!dev->bulk_out_endpointAddr &&
6b216df8 CC	288	((endpoint->bEndpointAddress & USB_ENDPOINT_DIR_MASK)
6b216df8 CC	289	== USB_DIR_OUT) &&
1da177e4 LT	290	((endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
	291	== USB_ENDPOINT_XFER_BULK)) {
	292	/* we found a bulk out endpoint */
	293	dev->bulk_out_endpointAddr = endpoint->bEndpointAddress;
	294	}
	295	}
	296	if (!(dev->bulk_in_endpointAddr && dev->bulk_out_endpointAddr)) {
	297	err("Could not find both bulk-in and bulk-out endpoints");
	298	goto error;
	299	}
	300
	301	/* save our data pointer in this interface device */
	302	usb_set_intfdata(interface, dev);
	303
	304	/* we can register the device now, as it is ready */
	305	retval = usb_register_dev(interface, &skel_class);
	306	if (retval) {
	307	/* something prevented us from registering this driver */
	308	err("Not able to get a minor for this device.");
	309	usb_set_intfdata(interface, NULL);
	310	goto error;
	311	}
	312
	313	/* let the user know what node this device is now attached to */
	314	info("USB Skeleton device now attached to USBSkel-%d", interface->minor);
	315	return 0;
	316
	317	error:
	318	if (dev)
	319	kref_put(&dev->kref, skel_delete);
	320	return retval;
	321	}
	322
	323	static void skel_disconnect(struct usb_interface *interface)
	324	{
	325	struct usb_skel *dev;
	326	int minor = interface->minor;
	327
	328	/* prevent skel_open() from racing skel_disconnect() */
	329	lock_kernel();
	330
	331	dev = usb_get_intfdata(interface);
	332	usb_set_intfdata(interface, NULL);
	333
	334	/* give back our minor */
	335	usb_deregister_dev(interface, &skel_class);
	336
	337	unlock_kernel();
	338
	339	/* decrement our usage count */
	340	kref_put(&dev->kref, skel_delete);
	341
	342	info("USB Skeleton #%d now disconnected", minor);
	343	}
	344
	345	static struct usb_driver skel_driver = {
1da177e4 LT	346	.name = "skeleton",
	347	.probe = skel_probe,
	348	.disconnect = skel_disconnect,
	349	.id_table = skel_table,
	350	};
	351
	352	static int __init usb_skel_init(void)
	353	{
	354	int result;
	355
	356	/* register this driver with the USB subsystem */
	357	result = usb_register(&skel_driver);
	358	if (result)
	359	err("usb_register failed. Error number %d", result);
	360
	361	return result;
	362	}
	363
	364	static void __exit usb_skel_exit(void)
	365	{
	366	/* deregister this driver with the USB subsystem */
	367	usb_deregister(&skel_driver);
	368	}
	369
	370	module_init (usb_skel_init);
	371	module_exit (usb_skel_exit);
	372
	373	MODULE_LICENSE("GPL");