[net-next-2.6.git] / drivers / usb / usb-skeleton.c

/*
 * USB Skeleton driver - 2.1
 *
 * 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 easier to read and use.
 *
 */

#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>
#include <linux/mutex.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;
	struct mutex		io_mutex;		/* synchronize I/O with disconnect */
};
#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;

	mutex_lock(&dev->io_mutex);
	if (!dev->interface) {		/* disconnect() was called */
		retval = -ENODEV;
		goto exit;
	}

	/* 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;
	}

exit:
	mutex_unlock(&dev->io_mutex);
	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;
	}

	mutex_lock(&dev->io_mutex);
	if (!dev->interface) {		/* disconnect() was called */
		retval = -ENODEV;
		goto error;
	}

	/* 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);

	mutex_unlock(&dev->io_mutex);
	return writesize;

error:
	if (urb) {
		usb_buffer_free(dev->udev, writesize, buf, urb->transfer_dma);
		usb_free_urb(urb);
	}
	mutex_unlock(&dev->io_mutex);
	up(&dev->limit_sem);

exit:
	return retval;
}

static const 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);
	mutex_init(&dev->io_mutex);

	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);

	/* prevent more I/O from starting */
	mutex_lock(&dev->io_mutex);
	dev->interface = NULL;
	mutex_unlock(&dev->io_mutex);

	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	1	/*
121e287c	2	* USB Skeleton driver - 2.1
1da177e4 LT	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
121e287c	11	* but has been rewritten to be easier to read and use.
1da177e4 LT	12	*
	13	*/
	14
1da177e4 LT	15	#include <linux/kernel.h>
	16	#include <linux/errno.h>
	17	#include <linux/init.h>
	18	#include <linux/slab.h>
	19	#include <linux/module.h>
	20	#include <linux/kref.h>
	21	#include <asm/uaccess.h>
	22	#include <linux/usb.h>
121e287c	23	#include <linux/mutex.h>
1da177e4 LT	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;
121e287c	55	struct mutex io_mutex; /* synchronize I/O with disconnect */
1da177e4 LT	56	};
	57	#define to_skel_dev(d) container_of(d, struct usb_skel, kref)
	58
	59	static struct usb_driver skel_driver;
	60
	61	static void skel_delete(struct kref *kref)
	62	{
	63	struct usb_skel *dev = to_skel_dev(kref);
	64
	65	usb_put_dev(dev->udev);
	66	kfree (dev->bulk_in_buffer);
	67	kfree (dev);
	68	}
	69
	70	static int skel_open(struct inode inode, struct file file)
	71	{
	72	struct usb_skel *dev;
	73	struct usb_interface *interface;
	74	int subminor;
	75	int retval = 0;
	76
	77	subminor = iminor(inode);
	78
	79	interface = usb_find_interface(&skel_driver, subminor);
	80	if (!interface) {
	81	err ("%s - error, can't find device for minor %d",
	82	__FUNCTION__, subminor);
	83	retval = -ENODEV;
	84	goto exit;
	85	}
	86
	87	dev = usb_get_intfdata(interface);
	88	if (!dev) {
	89	retval = -ENODEV;
	90	goto exit;
	91	}
	92
	93	/* increment our usage count for the device */
	94	kref_get(&dev->kref);
	95
	96	/* save our object in the file's private structure */
	97	file->private_data = dev;
	98
	99	exit:
	100	return retval;
	101	}
	102
	103	static int skel_release(struct inode inode, struct file file)
	104	{
	105	struct usb_skel *dev;
	106
	107	dev = (struct usb_skel *)file->private_data;
	108	if (dev == NULL)
	109	return -ENODEV;
	110
	111	/* decrement the count on our device */
	112	kref_put(&dev->kref, skel_delete);
	113	return 0;
	114	}
	115
	116	static ssize_t skel_read(struct file file, char buffer, size_t count, loff_t *ppos)
	117	{
	118	struct usb_skel *dev;
	119	int retval = 0;
120	int bytes_read;
121
122	dev = (struct usb_skel *)file->private_data;
121e287c AS	123
	124	mutex_lock(&dev->io_mutex);
	125	if (!dev->interface) { /* disconnect() was called */
	126	retval = -ENODEV;
	127	goto exit;
	128	}
	129
1da177e4 LT	130	/* do a blocking bulk read to get data from the device */
	131	retval = usb_bulk_msg(dev->udev,
	132	usb_rcvbulkpipe(dev->udev, dev->bulk_in_endpointAddr),
	133	dev->bulk_in_buffer,
	134	min(dev->bulk_in_size, count),
	135	&bytes_read, 10000);
	136
	137	/* if the read was successful, copy the data to userspace */
	138	if (!retval) {
	139	if (copy_to_user(buffer, dev->bulk_in_buffer, bytes_read))
	140	retval = -EFAULT;
	141	else
	142	retval = bytes_read;
	143	}
	144
121e287c AS	145	exit:
121e287c AS	146	mutex_unlock(&dev->io_mutex);
1da177e4 LT	147	return retval;
	148	}
	149
	150	static void skel_write_bulk_callback(struct urb urb, struct pt_regs regs)
	151	{
	152	struct usb_skel *dev;
	153
	154	dev = (struct usb_skel *)urb->context;
	155
	156	/* sync/async unlink faults aren't errors */
	157	if (urb->status &&
	158	!(urb->status == -ENOENT \|\|
	159	urb->status == -ECONNRESET \|\|
	160	urb->status == -ESHUTDOWN)) {
	161	dbg("%s - nonzero write bulk status received: %d",
	162	__FUNCTION__, urb->status);
	163	}
	164
	165	/* free up our allocated buffer */
	166	usb_buffer_free(urb->dev, urb->transfer_buffer_length,
	167	urb->transfer_buffer, urb->transfer_dma);
ff906518	168	up(&dev->limit_sem);
1da177e4 LT	169	}
	170
	171	static ssize_t skel_write(struct file file, const char user_buffer, size_t count, loff_t *ppos)
	172	{
	173	struct usb_skel *dev;
	174	int retval = 0;
	175	struct urb *urb = NULL;
	176	char *buf = NULL;
c8dd7709	177	size_t writesize = min(count, (size_t)MAX_TRANSFER);
1da177e4 LT	178
	179	dev = (struct usb_skel *)file->private_data;
	180
	181	/* verify that we actually have some data to write */
	182	if (count == 0)
	183	goto exit;
	184
ff906518	185	/* limit the number of URBs in flight to stop a user from using up all RAM */
c8dd7709 SB	186	if (down_interruptible(&dev->limit_sem)) {
	187	retval = -ERESTARTSYS;
	188	goto exit;
	189	}
ff906518	190
121e287c AS	191	mutex_lock(&dev->io_mutex);
	192	if (!dev->interface) { /* disconnect() was called */
	193	retval = -ENODEV;
	194	goto error;
	195	}
	196
1da177e4 LT	197	/* create a urb, and a buffer for it, and copy the data to the urb */
	198	urb = usb_alloc_urb(0, GFP_KERNEL);
	199	if (!urb) {
	200	retval = -ENOMEM;
	201	goto error;
	202	}
	203
ff906518	204	buf = usb_buffer_alloc(dev->udev, writesize, GFP_KERNEL, &urb->transfer_dma);
1da177e4 LT	205	if (!buf) {
	206	retval = -ENOMEM;
	207	goto error;
	208	}
	209
ff906518	210	if (copy_from_user(buf, user_buffer, writesize)) {
1da177e4 LT	211	retval = -EFAULT;
	212	goto error;
	213	}
	214
	215	/* initialize the urb properly */
	216	usb_fill_bulk_urb(urb, dev->udev,
	217	usb_sndbulkpipe(dev->udev, dev->bulk_out_endpointAddr),
ff906518	218	buf, writesize, skel_write_bulk_callback, dev);
1da177e4 LT	219	urb->transfer_flags \|= URB_NO_TRANSFER_DMA_MAP;
	220
	221	/* send the data out the bulk port */
	222	retval = usb_submit_urb(urb, GFP_KERNEL);
	223	if (retval) {
	224	err("%s - failed submitting write urb, error %d", __FUNCTION__, retval);
	225	goto error;
	226	}
	227
	228	/* release our reference to this urb, the USB core will eventually free it entirely */
	229	usb_free_urb(urb);
	230
121e287c	231	mutex_unlock(&dev->io_mutex);
ff906518	232	return writesize;
1da177e4 LT	233
1da177e4 LT	234	error:
121e287c AS	235	if (urb) {
	236	usb_buffer_free(dev->udev, writesize, buf, urb->transfer_dma);
	237	usb_free_urb(urb);
	238	}
	239	mutex_unlock(&dev->io_mutex);
ff906518	240	up(&dev->limit_sem);
121e287c AS	241
121e287c AS	242	exit:
1da177e4 LT	243	return retval;
	244	}
	245
066202dd	246	static const struct file_operations skel_fops = {
1da177e4 LT	247	.owner = THIS_MODULE,
	248	.read = skel_read,
	249	.write = skel_write,
	250	.open = skel_open,
	251	.release = skel_release,
	252	};
	253
	254	/*
	255	* usb class driver info in order to get a minor number from the usb core,
595b14cb	256	* and to have the device registered with the driver core
1da177e4 LT	257	*/
1da177e4 LT	258	static struct usb_class_driver skel_class = {
d6e5bcf4	259	.name = "skel%d",
1da177e4	260	.fops = &skel_fops,
1da177e4 LT	261	.minor_base = USB_SKEL_MINOR_BASE,
	262	};
	263
	264	static int skel_probe(struct usb_interface interface, const struct usb_device_id id)
	265	{
	266	struct usb_skel *dev = NULL;
	267	struct usb_host_interface *iface_desc;
	268	struct usb_endpoint_descriptor *endpoint;
	269	size_t buffer_size;
	270	int i;
	271	int retval = -ENOMEM;
	272
	273	/* allocate memory for our device state and initialize it */
ff906518	274	dev = kzalloc(sizeof(*dev), GFP_KERNEL);
1da177e4 LT	275	if (dev == NULL) {
	276	err("Out of memory");
	277	goto error;
	278	}
1da177e4	279	kref_init(&dev->kref);
ff906518	280	sema_init(&dev->limit_sem, WRITES_IN_FLIGHT);
121e287c	281	mutex_init(&dev->io_mutex);
1da177e4 LT	282
	283	dev->udev = usb_get_dev(interface_to_usbdev(interface));
	284	dev->interface = interface;
	285
	286	/* set up the endpoint information */
	287	/* use only the first bulk-in and bulk-out endpoints */
	288	iface_desc = interface->cur_altsetting;
	289	for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
	290	endpoint = &iface_desc->endpoint[i].desc;
	291
	292	if (!dev->bulk_in_endpointAddr &&
6b216df8 CC	293	((endpoint->bEndpointAddress & USB_ENDPOINT_DIR_MASK)
6b216df8 CC	294	== USB_DIR_IN) &&
1da177e4 LT	295	((endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
	296	== USB_ENDPOINT_XFER_BULK)) {
	297	/* we found a bulk in endpoint */
	298	buffer_size = le16_to_cpu(endpoint->wMaxPacketSize);
	299	dev->bulk_in_size = buffer_size;
	300	dev->bulk_in_endpointAddr = endpoint->bEndpointAddress;
	301	dev->bulk_in_buffer = kmalloc(buffer_size, GFP_KERNEL);
	302	if (!dev->bulk_in_buffer) {
	303	err("Could not allocate bulk_in_buffer");
	304	goto error;
	305	}
	306	}
	307
	308	if (!dev->bulk_out_endpointAddr &&
6b216df8 CC	309	((endpoint->bEndpointAddress & USB_ENDPOINT_DIR_MASK)
6b216df8 CC	310	== USB_DIR_OUT) &&
1da177e4 LT	311	((endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
	312	== USB_ENDPOINT_XFER_BULK)) {
	313	/* we found a bulk out endpoint */
	314	dev->bulk_out_endpointAddr = endpoint->bEndpointAddress;
	315	}
	316	}
	317	if (!(dev->bulk_in_endpointAddr && dev->bulk_out_endpointAddr)) {
	318	err("Could not find both bulk-in and bulk-out endpoints");
	319	goto error;
	320	}
	321
	322	/* save our data pointer in this interface device */
	323	usb_set_intfdata(interface, dev);
	324
	325	/* we can register the device now, as it is ready */
	326	retval = usb_register_dev(interface, &skel_class);
	327	if (retval) {
	328	/* something prevented us from registering this driver */
	329	err("Not able to get a minor for this device.");
	330	usb_set_intfdata(interface, NULL);
	331	goto error;
	332	}
	333
	334	/* let the user know what node this device is now attached to */
	335	info("USB Skeleton device now attached to USBSkel-%d", interface->minor);
	336	return 0;
	337
	338	error:
	339	if (dev)
	340	kref_put(&dev->kref, skel_delete);
	341	return retval;
	342	}
	343
	344	static void skel_disconnect(struct usb_interface *interface)
	345	{
	346	struct usb_skel *dev;
	347	int minor = interface->minor;
	348
	349	/* prevent skel_open() from racing skel_disconnect() */
	350	lock_kernel();
	351
	352	dev = usb_get_intfdata(interface);
	353	usb_set_intfdata(interface, NULL);
	354
	355	/* give back our minor */
	356	usb_deregister_dev(interface, &skel_class);
	357
121e287c AS	358	/* prevent more I/O from starting */
	359	mutex_lock(&dev->io_mutex);
	360	dev->interface = NULL;
	361	mutex_unlock(&dev->io_mutex);
	362
1da177e4 LT	363	unlock_kernel();
	364
	365	/* decrement our usage count */
	366	kref_put(&dev->kref, skel_delete);
	367
	368	info("USB Skeleton #%d now disconnected", minor);
	369	}
	370
	371	static struct usb_driver skel_driver = {
1da177e4 LT	372	.name = "skeleton",
	373	.probe = skel_probe,
	374	.disconnect = skel_disconnect,
	375	.id_table = skel_table,
	376	};
	377
	378	static int __init usb_skel_init(void)
	379	{
	380	int result;
	381
	382	/* register this driver with the USB subsystem */
	383	result = usb_register(&skel_driver);
	384	if (result)
	385	err("usb_register failed. Error number %d", result);
	386
	387	return result;
	388	}
	389
	390	static void __exit usb_skel_exit(void)
	391	{
	392	/* deregister this driver with the USB subsystem */
	393	usb_deregister(&skel_driver);
	394	}
	395
	396	module_init (usb_skel_init);
	397	module_exit (usb_skel_exit);
	398
	399	MODULE_LICENSE("GPL");