Release 4.14 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/slab.h>
#include <linux/module.h>
#include <linux/kref.h>
#include <linux/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 const 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)
/* MAX_TRANSFER is chosen so that the VM is not stressed by
   allocations > PAGE_SIZE and the number of packets in a page
   is an integer 512 is the largest possible packet on EHCI */

#define WRITES_IN_FLIGHT	8
/* arbitrarily chosen */

/* 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 */
	
struct usb_anchor	submitted;		/* in case we need to retract our submissions */
	
struct urb		*bulk_in_urb;		/* the urb to read data with */
	
unsigned char           *bulk_in_buffer;	/* the buffer to receive data */
	
size_t			bulk_in_size;		/* the size of the receive buffer */
	
size_t			bulk_in_filled;		/* number of bytes in the buffer */
	
size_t			bulk_in_copied;		/* already copied to user space */
	
__u8			bulk_in_endpointAddr;	/* the address of the bulk in endpoint */
	
__u8			bulk_out_endpointAddr;	/* the address of the bulk out endpoint */
	
int			errors;			/* the last request tanked */
	
bool			ongoing_read;		/* a read is going on */
	
spinlock_t		err_lock;		/* lock for errors */
	
struct kref		kref;
	
struct mutex		io_mutex;		/* synchronize I/O with disconnect */
	
wait_queue_head_t	bulk_in_wait;		/* to wait for an ongoing read */
};

#define to_skel_dev(d) container_of(d, struct usb_skel, kref)


static struct usb_driver skel_driver;
static void skel_draw_down(struct usb_skel *dev);



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

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

Contributors
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CommitProp
Greg Kroah-Hartman
33
70.21%
1
33.33%
Linus Torvalds
7
14.89%
1
33.33%
Oliver Neukum
7
14.89%
1
33.33%
Total
47
100.00%
3
100.00%



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) {
		pr_err("%s - error, can't find device for minor %d\n",
			__func__, subminor);
		retval = -ENODEV;
		goto exit;
	}

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

	retval = usb_autopm_get_interface(interface);
	if (retval)
		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;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds
53
40.15%
1
8.33%
Greg Kroah-Hartman
39
29.55%
4
33.33%
Alan Stern
24
18.18%
2
16.67%
Constantine Shulyupin
10
7.58%
1
8.33%
Oliver Neukum
4
3.03%
2
16.67%
Harvey Harrison
1
0.76%
1
8.33%
Al Viro
1
0.76%
1
8.33%
Total
132
100.00%
12
100.00%



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

	dev = 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;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds
35
43.21%
2
50.00%
Alan Stern
30
37.04%
1
25.00%
Greg Kroah-Hartman
16
19.75%
1
25.00%
Total
81
100.00%
4
100.00%



static int skel_flush(struct file *file, fl_owner_t id)
{
	struct usb_skel *dev;
	int res;

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

	/* wait for io to stop */
	mutex_lock(&dev->io_mutex);
	skel_draw_down(dev);

	/* read out errors, leave subsequent opens a clean slate */
	spin_lock_irq(&dev->err_lock);
	res = dev->errors ? (dev->errors == -EPIPE ? -EPIPE : -EIO) : 0;
	dev->errors = 0;
	spin_unlock_irq(&dev->err_lock);

	mutex_unlock(&dev->io_mutex);

	return res;
}

Contributors
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Oliver Neukum
109
100.00%
2
100.00%
Total
109
100.00%
2
100.00%



static void skel_read_bulk_callback(struct urb *urb)
{
	struct usb_skel *dev;

	dev = urb->context;

	spin_lock(&dev->err_lock);
	/* sync/async unlink faults aren't errors */
	if (urb->status) {
		if (!(urb->status == -ENOENT ||
		    urb->status == -ECONNRESET ||
		    urb->status == -ESHUTDOWN))
			dev_err(&dev->interface->dev,
				"%s - nonzero write bulk status received: %d\n",
				__func__, urb->status);

		dev->errors = urb->status;
	} else {
		dev->bulk_in_filled = urb->actual_length;
	}
	dev->ongoing_read = 0;
	spin_unlock(&dev->err_lock);

	wake_up_interruptible(&dev->bulk_in_wait);
}

Contributors
Person
Tokens
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CommitProp
Oliver Neukum
113
91.13%
1
33.33%
Greg Kroah-Hartman
9
7.26%
1
33.33%
Du Xing
2
1.61%
1
33.33%
Total
124
100.00%
3
100.00%



static int skel_do_read_io(struct usb_skel *dev, size_t count)
{
	int rv;

	/* prepare a read */
	usb_fill_bulk_urb(dev->bulk_in_urb,
			dev->udev,
			usb_rcvbulkpipe(dev->udev,
				dev->bulk_in_endpointAddr),
			dev->bulk_in_buffer,
			min(dev->bulk_in_size, count),
			skel_read_bulk_callback,
			dev);
	/* tell everybody to leave the URB alone */
	spin_lock_irq(&dev->err_lock);
	dev->ongoing_read = 1;
	spin_unlock_irq(&dev->err_lock);

	/* submit bulk in urb, which means no data to deliver */
	dev->bulk_in_filled = 0;
	dev->bulk_in_copied = 0;

	/* do it */
	rv = usb_submit_urb(dev->bulk_in_urb, GFP_KERNEL);
	if (rv < 0) {
		dev_err(&dev->interface->dev,
			"%s - failed submitting read urb, error %d\n",
			__func__, rv);
		rv = (rv == -ENOMEM) ? rv : -EIO;
		spin_lock_irq(&dev->err_lock);
		dev->ongoing_read = 0;
		spin_unlock_irq(&dev->err_lock);
	}

	return rv;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Oliver Neukum
146
86.90%
2
50.00%
Du Xing
13
7.74%
1
25.00%
Greg Kroah-Hartman
9
5.36%
1
25.00%
Total
168
100.00%
4
100.00%



static ssize_t skel_read(struct file *file, char *buffer, size_t count,
			 loff_t *ppos)
{
	struct usb_skel *dev;
	int rv;
	bool ongoing_io;

	dev = file->private_data;

	/* if we cannot read at all, return EOF */
	if (!dev->bulk_in_urb || !count)
		return 0;

	/* no concurrent readers */
	rv = mutex_lock_interruptible(&dev->io_mutex);
	if (rv < 0)
		return rv;

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

	/* if IO is under way, we must not touch things */
retry:
	spin_lock_irq(&dev->err_lock);
	ongoing_io = dev->ongoing_read;
	spin_unlock_irq(&dev->err_lock);

	if (ongoing_io) {
		/* nonblocking IO shall not wait */
		if (file->f_flags & O_NONBLOCK) {
			rv = -EAGAIN;
			goto exit;
		}
		/*
                 * IO may take forever
                 * hence wait in an interruptible state
                 */
		rv = wait_event_interruptible(dev->bulk_in_wait, (!dev->ongoing_read));
		if (rv < 0)
			goto exit;
	}

	/* errors must be reported */
	rv = dev->errors;
	if (rv < 0) {
		/* any error is reported once */
		dev->errors = 0;
		/* to preserve notifications about reset */
		rv = (rv == -EPIPE) ? rv : -EIO;
		/* report it */
		goto exit;
	}

	/*
         * if the buffer is filled we may satisfy the read
         * else we need to start IO
         */

	if (dev->bulk_in_filled) {
		/* we had read data */
		size_t available = dev->bulk_in_filled - dev->bulk_in_copied;
		size_t chunk = min(available, count);

		if (!available) {
			/*
                         * all data has been used
                         * actual IO needs to be done
                         */
			rv = skel_do_read_io(dev, count);
			if (rv < 0)
				goto exit;
			else
				goto retry;
		}
		/*
                 * data is available
                 * chunk tells us how much shall be copied
                 */

		if (copy_to_user(buffer,
				 dev->bulk_in_buffer + dev->bulk_in_copied,
				 chunk))
			rv = -EFAULT;
		else
			rv = chunk;

		dev->bulk_in_copied += chunk;

		/*
                 * if we are asked for more than we have,
                 * we start IO but don't wait
                 */
		if (available < count)
			skel_do_read_io(dev, count - chunk);
	} else {
		/* no data in the buffer */
		rv = skel_do_read_io(dev, count);
		if (rv < 0)
			goto exit;
		else
			goto retry;
	}
exit:
	mutex_unlock(&dev->io_mutex);
	return rv;
}

Contributors
Person
Tokens
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Commits
CommitProp
Oliver Neukum
234
65.36%
2
20.00%
Linus Torvalds
64
17.88%
1
10.00%
Alan Stern
37
10.34%
2
20.00%
Greg Kroah-Hartman
12
3.35%
2
20.00%
Du Xing
9
2.51%
1
10.00%
Al Viro
1
0.28%
1
10.00%
Chen Wang
1
0.28%
1
10.00%
Total
358
100.00%
10
100.00%



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

	dev = urb->context;

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

		spin_lock(&dev->err_lock);
		dev->errors = urb->status;
		spin_unlock(&dev->err_lock);
	}

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

Contributors
Person
Tokens
Prop
Commits
CommitProp
Greg Kroah-Hartman
72
56.69%
3
37.50%
Oliver Neukum
36
28.35%
2
25.00%
Linus Torvalds
17
13.39%
1
12.50%
Harvey Harrison
1
0.79%
1
12.50%
Daniel Mack
1
0.79%
1
12.50%
Total
127
100.00%
8
100.00%



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 = 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 (!(file->f_flags & O_NONBLOCK)) {
		if (down_interruptible(&dev->limit_sem)) {
			retval = -ERESTARTSYS;
			goto exit;
		}
	} else {
		if (down_trylock(&dev->limit_sem)) {
			retval = -EAGAIN;
			goto exit;
		}
	}

	spin_lock_irq(&dev->err_lock);
	retval = dev->errors;
	if (retval < 0) {
		/* any error is reported once */
		dev->errors = 0;
		/* to preserve notifications about reset */
		retval = (retval == -EPIPE) ? retval : -EIO;
	}
	spin_unlock_irq(&dev->err_lock);
	if (retval < 0)
		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_alloc_coherent(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;
	}

	/* this lock makes sure we don't submit URBs to gone devices */
	mutex_lock(&dev->io_mutex);
	if (!dev->interface) {		/* disconnect() was called */
		mutex_unlock(&dev->io_mutex);
		retval = -ENODEV;
		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;
	usb_anchor_urb(urb, &dev->submitted);

	/* send the data out the bulk port */
	retval = usb_submit_urb(urb, GFP_KERNEL);
	mutex_unlock(&dev->io_mutex);
	if (retval) {
		dev_err(&dev->interface->dev,
			"%s - failed submitting write urb, error %d\n",
			__func__, retval);
		goto error_unanchor;
	}

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


	return writesize;

error_unanchor:
	usb_unanchor_urb(urb);
error:
	if (urb) {
		usb_free_coherent(dev->udev, writesize, buf, urb->transfer_dma);
		usb_free_urb(urb);
	}
	up(&dev->limit_sem);

exit:
	return retval;
}

Contributors
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CommitProp
Oliver Neukum
181
40.04%
4
23.53%
Greg Kroah-Hartman
171
37.83%
4
23.53%
Linus Torvalds
58
12.83%
1
5.88%
Alan Stern
19
4.20%
2
11.76%
Sam Bishop
16
3.54%
1
5.88%
Daniel Mack
2
0.44%
1
5.88%
Julia Lawall
2
0.44%
1
5.88%
Harvey Harrison
1
0.22%
1
5.88%
Kay Sievers
1
0.22%
1
5.88%
Olav Kongas
1
0.22%
1
5.88%
Total
452
100.00%
17
100.00%


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

/*
 * 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_endpoint_descriptor *bulk_in, *bulk_out;
	int retval;

	/* allocate memory for our device state and initialize it */
	dev = kzalloc(sizeof(*dev), GFP_KERNEL);
	if (!dev)
		return -ENOMEM;

	kref_init(&dev->kref);
	sema_init(&dev->limit_sem, WRITES_IN_FLIGHT);
	mutex_init(&dev->io_mutex);
	spin_lock_init(&dev->err_lock);
	init_usb_anchor(&dev->submitted);
	init_waitqueue_head(&dev->bulk_in_wait);

	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 */
	retval = usb_find_common_endpoints(interface->cur_altsetting,
			&bulk_in, &bulk_out, NULL, NULL);
	if (retval) {
		dev_err(&interface->dev,
			"Could not find both bulk-in and bulk-out endpoints\n");
		goto error;
	}

	dev->bulk_in_size = usb_endpoint_maxp(bulk_in);
	dev->bulk_in_endpointAddr = bulk_in->bEndpointAddress;
	dev->bulk_in_buffer = kmalloc(dev->bulk_in_size, GFP_KERNEL);
	if (!dev->bulk_in_buffer) {
		retval = -ENOMEM;
		goto error;
	}
	dev->bulk_in_urb = usb_alloc_urb(0, GFP_KERNEL);
	if (!dev->bulk_in_urb) {
		retval = -ENOMEM;
		goto error;
	}

	dev->bulk_out_endpointAddr = bulk_out->bEndpointAddress;

	/* 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 */
		dev_err(&interface->dev,
			"Not able to get a minor for this device.\n");
		usb_set_intfdata(interface, NULL);
		goto error;
	}

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

error:
	/* this frees allocated memory */
	kref_put(&dev->kref, skel_delete);

	return retval;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds
100
30.58%
1
4.35%
Oliver Neukum
83
25.38%
5
21.74%
Greg Kroah-Hartman
62
18.96%
9
39.13%
Johan Hovold
55
16.82%
1
4.35%
Alan Stern
16
4.89%
2
8.70%
Matt Kraai
6
1.83%
1
4.35%
Du Xing
2
0.61%
1
4.35%
Luiz Fernando N. Capitulino
1
0.31%
1
4.35%
Kay Sievers
1
0.31%
1
4.35%
Michael Hayes
1
0.31%
1
4.35%
Total
327
100.00%
23
100.00%



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

	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);

	usb_kill_anchored_urbs(&dev->submitted);

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

	dev_info(&interface->dev, "USB Skeleton #%d now disconnected", minor);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Greg Kroah-Hartman
30
30.00%
6
50.00%
Linus Torvalds
29
29.00%
1
8.33%
Alan Stern
26
26.00%
2
16.67%
Oliver Neukum
8
8.00%
1
8.33%
Matt Kraai
6
6.00%
1
8.33%
Kay Sievers
1
1.00%
1
8.33%
Total
100
100.00%
12
100.00%



static void skel_draw_down(struct usb_skel *dev)
{
	int time;

	time = usb_wait_anchor_empty_timeout(&dev->submitted, 1000);
	if (!time)
		usb_kill_anchored_urbs(&dev->submitted);
	usb_kill_urb(dev->bulk_in_urb);
}

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Oliver Neukum
46
100.00%
2
100.00%
Total
46
100.00%
2
100.00%



static int skel_suspend(struct usb_interface *intf, pm_message_t message)
{
	struct usb_skel *dev = usb_get_intfdata(intf);

	if (!dev)
		return 0;
	skel_draw_down(dev);
	return 0;
}

Contributors
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Oliver Neukum
40
100.00%
1
100.00%
Total
40
100.00%
1
100.00%



static int skel_resume(struct usb_interface *intf)
{
	return 0;
}

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Oliver Neukum
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1
100.00%
Total
14
100.00%
1
100.00%



static int skel_pre_reset(struct usb_interface *intf)
{
	struct usb_skel *dev = usb_get_intfdata(intf);

	mutex_lock(&dev->io_mutex);
	skel_draw_down(dev);

	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Oliver Neukum
37
100.00%
1
100.00%
Total
37
100.00%
1
100.00%



static int skel_post_reset(struct usb_interface *intf)
{
	struct usb_skel *dev = usb_get_intfdata(intf);

	/* we are sure no URBs are active - no locking needed */
	dev->errors = -EPIPE;
	mutex_unlock(&dev->io_mutex);

	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Oliver Neukum
40
100.00%
1
100.00%
Total
40
100.00%
1
100.00%


static struct usb_driver skel_driver = {
	.name =		"skeleton",
	.probe =	skel_probe,
	.disconnect =	skel_disconnect,
	.suspend =	skel_suspend,
	.resume =	skel_resume,
	.pre_reset =	skel_pre_reset,
	.post_reset =	skel_post_reset,
	.id_table =	skel_table,
	.supports_autosuspend = 1,
};


module_usb_driver(skel_driver);

MODULE_LICENSE("GPL");
Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
Oliver Neukum
1187
47.16%
11
20.00%
Greg Kroah-Hartman
551
21.89%
18
32.73%
Linus Torvalds
469
18.63%
3
5.45%
Alan Stern
161
6.40%
3
5.45%
Johan Hovold
55
2.19%
1
1.82%
Du Xing
28
1.11%
1
1.82%
Sam Bishop
16
0.64%
1
1.82%
Matt Kraai
12
0.48%
1
1.82%
Constantine Shulyupin
10
0.40%
1
1.82%
Luiz Fernando N. Capitulino
5
0.20%
2
3.64%
Arnd Bergmann
5
0.20%
1
1.82%
Kay Sievers
3
0.12%
2
3.64%
Harvey Harrison
3
0.12%
1
1.82%
Daniel Mack
3
0.12%
1
1.82%
Julia Lawall
2
0.08%
1
1.82%
Al Viro
2
0.08%
2
3.64%
Olav Kongas
1
0.04%
1
1.82%
David Brownell
1
0.04%
1
1.82%
Márton Németh
1
0.04%
1
1.82%
Chen Wang
1
0.04%
1
1.82%
Michael Hayes
1
0.04%
1
1.82%
Total
2517
100.00%
55
100.00%
Directory: drivers/usb

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