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

/*
 * USB Skeleton driver - 2.2
 *
 * 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       *dev;			/* 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);

	/* prevent the device from being autosuspended */
	retval = usb_autopm_get_interface(interface);
	if (retval) {
		kref_put(&dev->kref, skel_delete);
		goto exit;
	}

	/* 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;

	/* allow the device to be autosuspended */
	mutex_lock(&dev->io_mutex);
	if (dev->interface)
		usb_autopm_put_interface(dev->interface);
	mutex_unlock(&dev->io_mutex);

	/* 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;
	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 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)) {
		err("%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;
	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) {
		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 &&
		    usb_endpoint_is_bulk_in(endpoint)) {
			/* 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 &&
		    usb_endpoint_is_bulk_out(endpoint)) {
			/* 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	/*
c0704541	2	* USB Skeleton driver - 2.2
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	*
c0704541	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	};
c0704541	35	MODULE_DEVICE_TABLE(usb, skel_table);
1da177e4 LT	36
	37
	38	/* Get a minor range for your devices from the usb maintainer */
	39	#define USB_SKEL_MINOR_BASE 192
	40
ff906518	41	/* our private defines. if this grows any larger, use your own .h file */
c0704541	42	#define MAX_TRANSFER (PAGE_SIZE - 512)
ff906518 ON	43	#define WRITES_IN_FLIGHT 8
ff906518 ON	44
1da177e4 LT	45	/* Structure to hold all of our device specific stuff */
1da177e4 LT	46	struct usb_skel {
c0704541 LFC	47	struct usb_device dev; / the usb device for this device */
c0704541 LFC	48	struct usb_interface interface; / the interface for this device */
ff906518	49	struct semaphore limit_sem; /* limiting the number of writes in progress */
c0704541	50	unsigned char bulk_in_buffer; / the buffer to receive data */
1da177e4 LT	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)
c0704541	62	{
1da177e4 LT	63	struct usb_skel *dev = to_skel_dev(kref);
	64
	65	usb_put_dev(dev->udev);
c0704541 LFC	66	kfree(dev->bulk_in_buffer);
c0704541 LFC	67	kfree(dev);
1da177e4 LT	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
5b064708 ON	93	/* increment our usage count for the device */
	94	kref_get(&dev->kref);
	95
01d883d4 AS	96	/* prevent the device from being autosuspended */
01d883d4 AS	97	retval = usb_autopm_get_interface(interface);
5b064708 ON	98	if (retval) {
5b064708 ON	99	kref_put(&dev->kref, skel_delete);
01d883d4	100	goto exit;
5b064708	101	}
1da177e4 LT	102
	103	/* save our object in the file's private structure */
	104	file->private_data = dev;
	105
	106	exit:
	107	return retval;
	108	}
	109
	110	static int skel_release(struct inode inode, struct file file)
	111	{
	112	struct usb_skel *dev;
	113
	114	dev = (struct usb_skel *)file->private_data;
	115	if (dev == NULL)
	116	return -ENODEV;
	117
01d883d4 AS	118	/* allow the device to be autosuspended */
	119	mutex_lock(&dev->io_mutex);
	120	if (dev->interface)
	121	usb_autopm_put_interface(dev->interface);
	122	mutex_unlock(&dev->io_mutex);
	123
1da177e4 LT	124	/* decrement the count on our device */
	125	kref_put(&dev->kref, skel_delete);
	126	return 0;
	127	}
	128
	129	static ssize_t skel_read(struct file file, char buffer, size_t count, loff_t *ppos)
	130	{
	131	struct usb_skel *dev;
c0704541	132	int retval;
1da177e4 LT	133	int bytes_read;
	134
	135	dev = (struct usb_skel *)file->private_data;
121e287c AS	136
	137	mutex_lock(&dev->io_mutex);
	138	if (!dev->interface) { /* disconnect() was called */
	139	retval = -ENODEV;
	140	goto exit;
	141	}
	142
1da177e4 LT	143	/* do a blocking bulk read to get data from the device */
	144	retval = usb_bulk_msg(dev->udev,
	145	usb_rcvbulkpipe(dev->udev, dev->bulk_in_endpointAddr),
	146	dev->bulk_in_buffer,
	147	min(dev->bulk_in_size, count),
	148	&bytes_read, 10000);
	149
	150	/* if the read was successful, copy the data to userspace */
	151	if (!retval) {
	152	if (copy_to_user(buffer, dev->bulk_in_buffer, bytes_read))
	153	retval = -EFAULT;
	154	else
	155	retval = bytes_read;
	156	}
	157
121e287c AS	158	exit:
121e287c AS	159	mutex_unlock(&dev->io_mutex);
1da177e4 LT	160	return retval;
	161	}
	162
7d12e780	163	static void skel_write_bulk_callback(struct urb *urb)
1da177e4 LT	164	{
	165	struct usb_skel *dev;
	166
	167	dev = (struct usb_skel *)urb->context;
	168
	169	/* sync/async unlink faults aren't errors */
c0704541 LFC	170	if (urb->status &&
c0704541 LFC	171	!(urb->status == -ENOENT \|\|
1da177e4 LT	172	urb->status == -ECONNRESET \|\|
1da177e4 LT	173	urb->status == -ESHUTDOWN)) {
c0704541	174	err("%s - nonzero write bulk status received: %d",
1da177e4 LT	175	__FUNCTION__, urb->status);
	176	}
	177
	178	/* free up our allocated buffer */
c0704541	179	usb_buffer_free(urb->dev, urb->transfer_buffer_length,
1da177e4	180	urb->transfer_buffer, urb->transfer_dma);
ff906518	181	up(&dev->limit_sem);
1da177e4 LT	182	}
	183
	184	static ssize_t skel_write(struct file file, const char user_buffer, size_t count, loff_t *ppos)
	185	{
	186	struct usb_skel *dev;
	187	int retval = 0;
	188	struct urb *urb = NULL;
	189	char *buf = NULL;
c8dd7709	190	size_t writesize = min(count, (size_t)MAX_TRANSFER);
1da177e4 LT	191
	192	dev = (struct usb_skel *)file->private_data;
	193
	194	/* verify that we actually have some data to write */
	195	if (count == 0)
	196	goto exit;
	197
ff906518	198	/* limit the number of URBs in flight to stop a user from using up all RAM */
c8dd7709 SB	199	if (down_interruptible(&dev->limit_sem)) {
	200	retval = -ERESTARTSYS;
	201	goto exit;
	202	}
ff906518	203
121e287c AS	204	mutex_lock(&dev->io_mutex);
	205	if (!dev->interface) { /* disconnect() was called */
	206	retval = -ENODEV;
	207	goto error;
	208	}
	209
1da177e4 LT	210	/* create a urb, and a buffer for it, and copy the data to the urb */
	211	urb = usb_alloc_urb(0, GFP_KERNEL);
	212	if (!urb) {
	213	retval = -ENOMEM;
	214	goto error;
	215	}
	216
ff906518	217	buf = usb_buffer_alloc(dev->udev, writesize, GFP_KERNEL, &urb->transfer_dma);
1da177e4 LT	218	if (!buf) {
	219	retval = -ENOMEM;
	220	goto error;
	221	}
	222
ff906518	223	if (copy_from_user(buf, user_buffer, writesize)) {
1da177e4 LT	224	retval = -EFAULT;
	225	goto error;
	226	}
	227
	228	/* initialize the urb properly */
	229	usb_fill_bulk_urb(urb, dev->udev,
	230	usb_sndbulkpipe(dev->udev, dev->bulk_out_endpointAddr),
ff906518	231	buf, writesize, skel_write_bulk_callback, dev);
1da177e4 LT	232	urb->transfer_flags \|= URB_NO_TRANSFER_DMA_MAP;
	233
	234	/* send the data out the bulk port */
	235	retval = usb_submit_urb(urb, GFP_KERNEL);
	236	if (retval) {
	237	err("%s - failed submitting write urb, error %d", __FUNCTION__, retval);
	238	goto error;
	239	}
	240
	241	/* release our reference to this urb, the USB core will eventually free it entirely */
	242	usb_free_urb(urb);
	243
121e287c	244	mutex_unlock(&dev->io_mutex);
ff906518	245	return writesize;
1da177e4 LT	246
1da177e4 LT	247	error:
121e287c AS	248	if (urb) {
	249	usb_buffer_free(dev->udev, writesize, buf, urb->transfer_dma);
	250	usb_free_urb(urb);
	251	}
	252	mutex_unlock(&dev->io_mutex);
ff906518	253	up(&dev->limit_sem);
121e287c AS	254
121e287c AS	255	exit:
1da177e4 LT	256	return retval;
	257	}
	258
066202dd	259	static const struct file_operations skel_fops = {
1da177e4 LT	260	.owner = THIS_MODULE,
	261	.read = skel_read,
	262	.write = skel_write,
	263	.open = skel_open,
	264	.release = skel_release,
	265	};
	266
c0704541	267	/*
1da177e4	268	* usb class driver info in order to get a minor number from the usb core,
595b14cb	269	* and to have the device registered with the driver core
1da177e4 LT	270	*/
1da177e4 LT	271	static struct usb_class_driver skel_class = {
d6e5bcf4	272	.name = "skel%d",
1da177e4	273	.fops = &skel_fops,
1da177e4 LT	274	.minor_base = USB_SKEL_MINOR_BASE,
	275	};
	276
	277	static int skel_probe(struct usb_interface interface, const struct usb_device_id id)
	278	{
c0704541	279	struct usb_skel *dev;
1da177e4 LT	280	struct usb_host_interface *iface_desc;
	281	struct usb_endpoint_descriptor *endpoint;
	282	size_t buffer_size;
	283	int i;
	284	int retval = -ENOMEM;
	285
	286	/* allocate memory for our device state and initialize it */
ff906518	287	dev = kzalloc(sizeof(*dev), GFP_KERNEL);
c0704541	288	if (!dev) {
1da177e4 LT	289	err("Out of memory");
	290	goto error;
	291	}
1da177e4	292	kref_init(&dev->kref);
ff906518	293	sema_init(&dev->limit_sem, WRITES_IN_FLIGHT);
121e287c	294	mutex_init(&dev->io_mutex);
1da177e4 LT	295
	296	dev->udev = usb_get_dev(interface_to_usbdev(interface));
	297	dev->interface = interface;
	298
	299	/* set up the endpoint information */
	300	/* use only the first bulk-in and bulk-out endpoints */
	301	iface_desc = interface->cur_altsetting;
	302	for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
	303	endpoint = &iface_desc->endpoint[i].desc;
	304
	305	if (!dev->bulk_in_endpointAddr &&
c0704541	306	usb_endpoint_is_bulk_in(endpoint)) {
1da177e4 LT	307	/* we found a bulk in endpoint */
	308	buffer_size = le16_to_cpu(endpoint->wMaxPacketSize);
	309	dev->bulk_in_size = buffer_size;
	310	dev->bulk_in_endpointAddr = endpoint->bEndpointAddress;
	311	dev->bulk_in_buffer = kmalloc(buffer_size, GFP_KERNEL);
	312	if (!dev->bulk_in_buffer) {
	313	err("Could not allocate bulk_in_buffer");
	314	goto error;
	315	}
	316	}
	317
	318	if (!dev->bulk_out_endpointAddr &&
c0704541	319	usb_endpoint_is_bulk_out(endpoint)) {
1da177e4 LT	320	/* we found a bulk out endpoint */
	321	dev->bulk_out_endpointAddr = endpoint->bEndpointAddress;
	322	}
	323	}
	324	if (!(dev->bulk_in_endpointAddr && dev->bulk_out_endpointAddr)) {
	325	err("Could not find both bulk-in and bulk-out endpoints");
	326	goto error;
	327	}
	328
	329	/* save our data pointer in this interface device */
	330	usb_set_intfdata(interface, dev);
	331
	332	/* we can register the device now, as it is ready */
	333	retval = usb_register_dev(interface, &skel_class);
	334	if (retval) {
	335	/* something prevented us from registering this driver */
	336	err("Not able to get a minor for this device.");
	337	usb_set_intfdata(interface, NULL);
	338	goto error;
	339	}
	340
	341	/* let the user know what node this device is now attached to */
	342	info("USB Skeleton device now attached to USBSkel-%d", interface->minor);
	343	return 0;
	344
	345	error:
	346	if (dev)
	347	kref_put(&dev->kref, skel_delete);
	348	return retval;
	349	}
	350
	351	static void skel_disconnect(struct usb_interface *interface)
	352	{
	353	struct usb_skel *dev;
	354	int minor = interface->minor;
	355
	356	/* prevent skel_open() from racing skel_disconnect() */
	357	lock_kernel();
	358
	359	dev = usb_get_intfdata(interface);
	360	usb_set_intfdata(interface, NULL);
	361
	362	/* give back our minor */
	363	usb_deregister_dev(interface, &skel_class);
	364
121e287c AS	365	/* prevent more I/O from starting */
	366	mutex_lock(&dev->io_mutex);
	367	dev->interface = NULL;
	368	mutex_unlock(&dev->io_mutex);
	369
1da177e4 LT	370	unlock_kernel();
	371
	372	/* decrement our usage count */
	373	kref_put(&dev->kref, skel_delete);
	374
	375	info("USB Skeleton #%d now disconnected", minor);
	376	}
	377
	378	static struct usb_driver skel_driver = {
1da177e4 LT	379	.name = "skeleton",
	380	.probe = skel_probe,
	381	.disconnect = skel_disconnect,
	382	.id_table = skel_table,
	383	};
	384
	385	static int __init usb_skel_init(void)
	386	{
	387	int result;
	388
	389	/* register this driver with the USB subsystem */
	390	result = usb_register(&skel_driver);
	391	if (result)
	392	err("usb_register failed. Error number %d", result);
	393
	394	return result;
	395	}
	396
	397	static void __exit usb_skel_exit(void)
	398	{
	399	/* deregister this driver with the USB subsystem */
	400	usb_deregister(&skel_driver);
	401	}
	402
c0704541 LFC	403	module_init(usb_skel_init);
c0704541 LFC	404	module_exit(usb_skel_exit);
1da177e4 LT	405
1da177e4 LT	406	MODULE_LICENSE("GPL");