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Commit 3b7e5b40 authored by Greg Kroah-Hartman's avatar Greg Kroah-Hartman
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USB: replace old usb-skeleton driver with a rewritten and simpler version. 

Signed-off-by: default avatarGreg Kroah-Hartman <greg@kroah.com>
parent f4561705
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Showing with 139 additions and 483 deletions
drivers/usb/usb-skeleton.c
View file @ 3b7e5b40
/*
* USB Skeleton driver - 1.1
* USB Skeleton driver - 2.0
*
* Copyright (C) 2001-2003 Greg Kroah-Hartman (greg@kroah.com)
* 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 to be used as a skeleton driver to be able to create a
* USB driver quickly. The design of it is based on the usb-serial and
* dc2xx drivers.
*
* Thanks to Oliver Neukum, David Brownell, and Alan Stern for their help
* in debugging this driver.
*
*
* History:
*
* 2003-05-06 - 1.1 - changes due to usb core changes with usb_register_dev()
* 2003-02-25 - 1.0 - fix races involving urb->status, unlink_urb(), and
* disconnect. Fix transfer amount in read(). Use
* macros instead of magic numbers in probe(). Change
* size variables to size_t. Show how to eliminate
* DMA bounce buffer.
* 2002_12_12 - 0.9 - compile fixes and got rid of fixed minor array.
* 2002_09_26 - 0.8 - changes due to USB core conversion to struct device
* driver.
* 2002_02_12 - 0.7 - zero out dev in probe function for devices that do
* not have both a bulk in and bulk out endpoint.
* Thanks to Holger Waechtler for the fix.
* 2001_11_05 - 0.6 - fix minor locking problem in skel_disconnect.
* Thanks to Pete Zaitcev for the fix.
* 2001_09_04 - 0.5 - fix devfs bug in skel_disconnect. Thanks to wim delvaux
* 2001_08_21 - 0.4 - more small bug fixes.
* 2001_05_29 - 0.3 - more bug fixes based on review from linux-usb-devel
* 2001_05_24 - 0.2 - bug fixes based on review from linux-usb-devel people
* 2001_05_01 - 0.1 - first version
* 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.
*
*/
......@@ -46,31 +19,10 @@
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/smp_lock.h>
#include <linux/completion.h>
#include <linux/kref.h>
#include <asm/uaccess.h>
#include <linux/usb.h>
#ifdef CONFIG_USB_DEBUG
static int debug = 1;
#else
static int debug;
#endif
/* Use our own dbg macro */
#undef dbg
#define dbg(format, arg...) do { if (debug) printk(KERN_DEBUG __FILE__ ": " format "\n" , ## arg); } while (0)
/* Version Information */
#define DRIVER_VERSION "v1.0"
#define DRIVER_AUTHOR "Greg Kroah-Hartman, greg@kroah.com"
#define DRIVER_DESC "USB Skeleton Driver"
/* Module parameters */
MODULE_PARM(debug, "i");
MODULE_PARM_DESC(debug, "Debug enabled or not");
/* Define these values to match your devices */
#define USB_SKEL_VENDOR_ID 0xfff0
......@@ -79,11 +31,8 @@ MODULE_PARM_DESC(debug, "Debug enabled or not");
/* 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) },
/* "Gadget Zero" firmware runs under Linux */
{ USB_DEVICE(0x0525, 0xa4a0) },
{ } /* Terminating entry */
};
MODULE_DEVICE_TABLE (usb, skel_table);
......@@ -92,413 +41,195 @@ MODULE_DEVICE_TABLE (usb, skel_table);
/* Structure to hold all of our device specific stuff */
struct usb_skel {
struct usb_device * udev; /* save off the usb device pointer */
struct usb_device * udev; /* the usb device for this device */
struct usb_interface * interface; /* the interface for this device */
unsigned char minor; /* the starting minor number for this device */
unsigned char num_ports; /* the number of ports this device has */
char num_interrupt_in; /* number of interrupt in endpoints we have */
char num_bulk_in; /* number of bulk in endpoints we have */
char num_bulk_out; /* number of bulk out endpoints we have */
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 */
unsigned char * bulk_out_buffer; /* the buffer to send data */
size_t bulk_out_size; /* the size of the send buffer */
struct urb * write_urb; /* the urb used to send data */
__u8 bulk_out_endpointAddr; /* the address of the bulk out endpoint */
atomic_t write_busy; /* true iff write urb is busy */
struct completion write_finished; /* wait for the write to finish */
int open; /* if the port is open or not */
int present; /* if the device is not disconnected */
struct semaphore sem; /* locks this structure */
};
/* prevent races between open() and disconnect() */
static DECLARE_MUTEX (disconnect_sem);
/* local function prototypes */
static ssize_t skel_read (struct file *file, char *buffer, size_t count, loff_t *ppos);
static ssize_t skel_write (struct file *file, const char *buffer, size_t count, loff_t *ppos);
static int skel_ioctl (struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg);
static int skel_open (struct inode *inode, struct file *file);
static int skel_release (struct inode *inode, struct file *file);
static int skel_probe (struct usb_interface *interface, const struct usb_device_id *id);
static void skel_disconnect (struct usb_interface *interface);
static void skel_write_bulk_callback (struct urb *urb, struct pt_regs *regs);
/*
* File operations needed when we register this driver.
* This assumes that this driver NEEDS file operations,
* of course, which means that the driver is expected
* to have a node in the /dev directory. If the USB
* device were for a network interface then the driver
* would use "struct net_driver" instead, and a serial
* device would use "struct tty_driver".
*/
static struct file_operations skel_fops = {
/*
* The owner field is part of the module-locking
* mechanism. The idea is that the kernel knows
* which module to increment the use-counter of
* BEFORE it calls the device's open() function.
* This also means that the kernel can decrement
* the use-counter again before calling release()
* or should the open() function fail.
*/
.owner = THIS_MODULE,
.read = skel_read,
.write = skel_write,
.ioctl = skel_ioctl,
.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 devfs and the driver core
*/
static struct usb_class_driver skel_class = {
.name = "usb/skel%d",
.fops = &skel_fops,
.mode = S_IFCHR | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH,
.minor_base = USB_SKEL_MINOR_BASE,
};
/* usb specific object needed to register this driver with the usb subsystem */
static struct usb_driver skel_driver = {
.owner = THIS_MODULE,
.name = "skeleton",
.probe = skel_probe,
.disconnect = skel_disconnect,
.id_table = skel_table,
struct kref kref;
};
#define to_skel_dev(d) container_of(d, struct usb_skel, kref)
static struct usb_driver skel_driver;
/**
* usb_skel_debug_data
*/
static inline void usb_skel_debug_data (const char *function, int size, const unsigned char *data)
{
int i;
static void skel_delete(struct kref *kref)
{
struct usb_skel *dev = to_skel_dev(kref);
if (!debug)
return;
printk (KERN_DEBUG __FILE__": %s - length = %d, data = ",
function, size);
for (i = 0; i < size; ++i) {
printk ("%.2x ", data[i]);
}
printk ("\n");
}
/**
* skel_delete
*/
static inline void skel_delete (struct usb_skel *dev)
{
usb_put_dev(dev->udev);
kfree (dev->bulk_in_buffer);
usb_buffer_free (dev->udev, dev->bulk_out_size,
dev->bulk_out_buffer,
dev->write_urb->transfer_dma);
usb_free_urb (dev->write_urb);
kfree (dev);
}
/**
* skel_open
*/
static int skel_open (struct inode *inode, struct file *file)
static int skel_open(struct inode *inode, struct file *file)
{
struct usb_skel *dev = NULL;
struct usb_skel *dev;
struct usb_interface *interface;
int subminor;
int retval = 0;
dbg("%s", __FUNCTION__);
subminor = iminor(inode);
/* prevent disconnects */
down (&disconnect_sem);
interface = usb_find_interface (&skel_driver, subminor);
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_no_device;
goto exit;
}
dev = usb_get_intfdata(interface);
if (!dev) {
retval = -ENODEV;
goto exit_no_device;
goto exit;
}
/* lock this device */
down (&dev->sem);
/* increment our usage count for the driver */
++dev->open;
/* increment our usage count for the device */
kref_get(&dev->kref);
/* save our object in the file's private structure */
file->private_data = dev;
/* unlock this device */
up (&dev->sem);
exit_no_device:
up (&disconnect_sem);
exit:
return retval;
}
/**
* skel_release
*/
static int skel_release (struct inode *inode, struct file *file)
static int skel_release(struct inode *inode, struct file *file)
{
struct usb_skel *dev;
int retval = 0;
dev = (struct usb_skel *)file->private_data;
if (dev == NULL) {
dbg ("%s - object is NULL", __FUNCTION__);
if (dev == NULL)
return -ENODEV;
}
dbg("%s - minor %d", __FUNCTION__, dev->minor);
/* lock our device */
down (&dev->sem);
if (dev->open <= 0) {
dbg ("%s - device not opened", __FUNCTION__);
retval = -ENODEV;
goto exit_not_opened;
}
/* wait for any bulk writes that might be going on to finish up */
if (atomic_read (&dev->write_busy))
wait_for_completion (&dev->write_finished);
--dev->open;
if (!dev->present && !dev->open) {
/* the device was unplugged before the file was released */
up (&dev->sem);
skel_delete (dev);
return 0;
}
exit_not_opened:
up (&dev->sem);
return retval;
/* decrement the count on our device */
kref_put(&dev->kref, skel_delete);
return 0;
}
/**
* skel_read
*/
static ssize_t skel_read (struct file *file, char *buffer, size_t count, loff_t *ppos)
static ssize_t skel_read(struct file *file, char *buffer, size_t count, loff_t *ppos)
{
struct usb_skel *dev;
int retval = 0;
dev = (struct usb_skel *)file->private_data;
dbg("%s - minor %d, count = %d", __FUNCTION__, dev->minor, count);
/* lock this object */
down (&dev->sem);
/* verify that the device wasn't unplugged */
if (!dev->present) {
up (&dev->sem);
return -ENODEV;
}
/* 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),
&count, HZ*10);
retval = usb_bulk_msg(dev->udev,
usb_rcvbulkpipe(dev->udev, dev->bulk_in_endpointAddr),
dev->bulk_in_buffer,
min(dev->bulk_in_size, count),
&count, HZ*10);
/* if the read was successful, copy the data to userspace */
if (!retval) {
if (copy_to_user (buffer, dev->bulk_in_buffer, count))
if (copy_to_user(buffer, dev->bulk_in_buffer, count))
retval = -EFAULT;
else
retval = count;
}
/* unlock the device */
up (&dev->sem);
return retval;
}
/**
* skel_write
*
* A device driver has to decide how to report I/O errors back to the
* user. The safest course is to wait for the transfer to finish before
* returning so that any errors will be reported reliably. skel_read()
* works like this. But waiting for I/O is slow, so many drivers only
* check for errors during I/O initiation and do not report problems
* that occur during the actual transfer. That's what we will do here.
*
* A driver concerned with maximum I/O throughput would use double-
* buffering: Two urbs would be devoted to write transfers, so that
* one urb could always be active while the other was waiting for the
* user to send more data.
*/
static ssize_t skel_write (struct file *file, const char *buffer, size_t count, loff_t *ppos)
static void skel_write_bulk_callback(struct urb *urb, struct pt_regs *regs)
{
struct usb_skel *dev;
ssize_t bytes_written = 0;
int retval = 0;
dev = (struct usb_skel *)file->private_data;
dev = (struct usb_skel *)urb->context;
dbg("%s - minor %d, count = %d", __FUNCTION__, dev->minor, count);
/* 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);
}
/* lock this object */
down (&dev->sem);
/* free up our allocated buffer */
usb_buffer_free(urb->dev, urb->transfer_buffer_length,
urb->transfer_buffer, urb->transfer_dma);
}
/* verify that the device wasn't unplugged */
if (!dev->present) {
retval = -ENODEV;
goto exit;
}
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;
dev = (struct usb_skel *)file->private_data;
/* verify that we actually have some data to write */
if (count == 0) {
dbg("%s - write request of 0 bytes", __FUNCTION__);
if (count == 0)
goto exit;
}
/* wait for a previous write to finish up; we don't use a timeout
* and so a nonresponsive device can delay us indefinitely.
*/
if (atomic_read (&dev->write_busy))
wait_for_completion (&dev->write_finished);
/* 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;
}
/* we can only write as much as our buffer will hold */
bytes_written = min (dev->bulk_out_size, count);
buf = usb_buffer_alloc(dev->udev, count, GFP_KERNEL, &urb->transfer_dma);
if (!buf) {
retval = -ENOMEM;
goto error;
}
/* copy the data from userspace into our transfer buffer;
* this is the only copy required.
*/
if (copy_from_user(dev->write_urb->transfer_buffer, buffer,
bytes_written)) {
if (copy_from_user(buf, user_buffer, count)) {
retval = -EFAULT;
goto exit;
goto error;
}
usb_skel_debug_data (__FUNCTION__, bytes_written,
dev->write_urb->transfer_buffer);
/* this urb was already set up, except for this write size */
dev->write_urb->transfer_buffer_length = bytes_written;
/* initialize the urb properly */
usb_fill_bulk_urb(urb, dev->udev,
usb_sndbulkpipe(dev->udev, dev->bulk_out_endpointAddr),
buf, count, skel_write_bulk_callback, dev);
urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
/* send the data out the bulk port */
/* a character device write uses GFP_KERNEL,
unless a spinlock is held */
init_completion (&dev->write_finished);
atomic_set (&dev->write_busy, 1);
retval = usb_submit_urb(dev->write_urb, GFP_KERNEL);
retval = usb_submit_urb(urb, GFP_KERNEL);
if (retval) {
atomic_set (&dev->write_busy, 0);
err("%s - failed submitting write urb, error %d",
__FUNCTION__, retval);
} else {
retval = bytes_written;
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:
/* unlock the device */
up (&dev->sem);
return count;
error:
usb_buffer_free(dev->udev, count, buf, urb->transfer_dma);
usb_free_urb(urb);
return retval;
}
static struct file_operations skel_fops = {
.owner = THIS_MODULE,
.read = skel_read,
.write = skel_write,
.open = skel_open,
.release = skel_release,
};
/**
* skel_ioctl
*/
static int skel_ioctl (struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
{
struct usb_skel *dev;
dev = (struct usb_skel *)file->private_data;
/* lock this object */
down (&dev->sem);
/* verify that the device wasn't unplugged */
if (!dev->present) {
up (&dev->sem);
return -ENODEV;
}
dbg("%s - minor %d, cmd 0x%.4x, arg %ld", __FUNCTION__,
dev->minor, cmd, arg);
/* fill in your device specific stuff here */
/* unlock the device */
up (&dev->sem);
/* return that we did not understand this ioctl call */
return -ENOTTY;
}
/**
* skel_write_bulk_callback
/*
* usb class driver info in order to get a minor number from the usb core,
* and to have the device registered with devfs and the driver core
*/
static void skel_write_bulk_callback (struct urb *urb, struct pt_regs *regs)
{
struct usb_skel *dev = (struct usb_skel *)urb->context;
dbg("%s - minor %d", __FUNCTION__, dev->minor);
/* sync/async unlink faults aren't errors */
if (urb->status && !(urb->status == -ENOENT ||
urb->status == -ECONNRESET)) {
dbg("%s - nonzero write bulk status received: %d",
__FUNCTION__, urb->status);
}
/* notify anyone waiting that the write has finished */
atomic_set (&dev->write_busy, 0);
complete (&dev->write_finished);
}
static struct usb_class_driver skel_class = {
.name = "usb/skel%d",
.fops = &skel_fops,
.mode = S_IFCHR | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH,
.minor_base = USB_SKEL_MINOR_BASE,
};
/**
* skel_probe
*
* Called by the usb core when a new device is connected that it thinks
* this driver might be interested in.
*/
static int skel_probe(struct usb_interface *interface, const struct usb_device_id *id)
{
struct usb_device *udev = interface_to_usbdev(interface);
struct usb_skel *dev = NULL;
struct usb_host_interface *iface_desc;
struct usb_endpoint_descriptor *endpoint;
......@@ -506,28 +237,21 @@ static int skel_probe(struct usb_interface *interface, const struct usb_device_i
int i;
int retval = -ENOMEM;
/* See if the device offered us matches what we can accept */
if ((udev->descriptor.idVendor != USB_SKEL_VENDOR_ID) ||
(udev->descriptor.idProduct != USB_SKEL_PRODUCT_ID)) {
return -ENODEV;
}
/* allocate memory for our device state and initialize it */
dev = kmalloc (sizeof(struct usb_skel), GFP_KERNEL);
dev = kmalloc(sizeof(*dev), GFP_KERNEL);
if (dev == NULL) {
err ("Out of memory");
return -ENOMEM;
err("Out of memory");
goto error;
}
memset (dev, 0x00, sizeof (*dev));
memset(dev, 0x00, sizeof(*dev));
kref_init(&dev->kref);
init_MUTEX (&dev->sem);
dev->udev = udev;
dev->udev = usb_get_dev(interface_to_usbdev(interface));
dev->interface = interface;
/* set up the endpoint information */
/* check out the endpoints */
/* use only the first bulk-in and bulk-out endpoints */
iface_desc = &interface->altsetting[0];
iface_desc = interface->cur_altsetting;
for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
endpoint = &iface_desc->endpoint[i].desc;
......@@ -539,9 +263,9 @@ static int skel_probe(struct usb_interface *interface, const struct usb_device_i
buffer_size = endpoint->wMaxPacketSize;
dev->bulk_in_size = buffer_size;
dev->bulk_in_endpointAddr = endpoint->bEndpointAddress;
dev->bulk_in_buffer = kmalloc (buffer_size, GFP_KERNEL);
dev->bulk_in_buffer = kmalloc(buffer_size, GFP_KERNEL);
if (!dev->bulk_in_buffer) {
err("Couldn't allocate bulk_in_buffer");
err("Could not allocate bulk_in_buffer");
goto error;
}
}
......@@ -551,153 +275,85 @@ static int skel_probe(struct usb_interface *interface, const struct usb_device_i
((endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
== USB_ENDPOINT_XFER_BULK)) {
/* we found a bulk out endpoint */
/* a probe() may sleep and has no restrictions on memory allocations */
dev->write_urb = usb_alloc_urb(0, GFP_KERNEL);
if (!dev->write_urb) {
err("No free urbs available");
goto error;
}
dev->bulk_out_endpointAddr = endpoint->bEndpointAddress;
/* on some platforms using this kind of buffer alloc
* call eliminates a dma "bounce buffer".
*
* NOTE: you'd normally want i/o buffers that hold
* more than one packet, so that i/o delays between
* packets don't hurt throughput.
*/
buffer_size = endpoint->wMaxPacketSize;
dev->bulk_out_size = buffer_size;
dev->write_urb->transfer_flags = (URB_NO_TRANSFER_DMA_MAP |
URB_ASYNC_UNLINK);
dev->bulk_out_buffer = usb_buffer_alloc (udev,
buffer_size, GFP_KERNEL,
&dev->write_urb->transfer_dma);
if (!dev->bulk_out_buffer) {
err("Couldn't allocate bulk_out_buffer");
goto error;
}
usb_fill_bulk_urb(dev->write_urb, udev,
usb_sndbulkpipe(udev,
endpoint->bEndpointAddress),
dev->bulk_out_buffer, buffer_size,
skel_write_bulk_callback, dev);
}
}
if (!(dev->bulk_in_endpointAddr && dev->bulk_out_endpointAddr)) {
err("Couldn't find both bulk-in and bulk-out endpoints");
err("Could not find both bulk-in and bulk-out endpoints");
goto error;
}
/* allow device read, write and ioctl */
dev->present = 1;
/* save our data pointer in this interface device */
usb_set_intfdata(interface, dev);
/* we can register the device now, as it is ready */
usb_set_intfdata (interface, dev);
retval = usb_register_dev (interface, &skel_class);
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);
err("Not able to get a minor for this device.");
usb_set_intfdata(interface, NULL);
goto error;
}
dev->minor = interface->minor;
/* let the user know what node this device is now attached to */
info ("USB Skeleton device now attached to USBSkel-%d", dev->minor);
info("USB Skeleton device now attached to USBSkel-%d", interface->minor);
return 0;
error:
skel_delete (dev);
if (dev)
kref_put(&dev->kref, skel_delete);
return retval;
}
/**
* skel_disconnect
*
* Called by the usb core when the device is removed from the system.
*
* This routine guarantees that the driver will not submit any more urbs
* by clearing dev->udev. It is also supposed to terminate any currently
* active urbs. Unfortunately, usb_bulk_msg(), used in skel_read(), does
* not provide any way to do this. But at least we can cancel an active
* write.
*/
static void skel_disconnect(struct usb_interface *interface)
{
struct usb_skel *dev;
int minor;
int minor = interface->minor;
/* prevent races with open() */
down (&disconnect_sem);
/* prevent skel_open() from racing skel_disconnect() */
lock_kernel();
dev = usb_get_intfdata (interface);
usb_set_intfdata (interface, NULL);
down (&dev->sem);
minor = dev->minor;
dev = usb_get_intfdata(interface);
usb_set_intfdata(interface, NULL);
/* give back our minor */
usb_deregister_dev (interface, &skel_class);
usb_deregister_dev(interface, &skel_class);
/* terminate an ongoing write */
if (atomic_read (&dev->write_busy)) {
usb_unlink_urb (dev->write_urb);
wait_for_completion (&dev->write_finished);
}
/* prevent device read, write and ioctl */
dev->present = 0;
up (&dev->sem);
unlock_kernel();
/* if the device is opened, skel_release will clean this up */
if (!dev->open)
skel_delete (dev);
up (&disconnect_sem);
/* decrement our usage count */
kref_put(&dev->kref, skel_delete);
info("USB Skeleton #%d now disconnected", minor);
}
static struct usb_driver skel_driver = {
.owner = THIS_MODULE,
.name = "skeleton",
.probe = skel_probe,
.disconnect = skel_disconnect,
.id_table = skel_table,
};
/**
* usb_skel_init
*/
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;
}
if (result)
err("usb_register failed. Error number %d", result);
info(DRIVER_DESC " " DRIVER_VERSION);
return 0;
return result;
}
/**
* usb_skel_exit
*/
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_AUTHOR(DRIVER_AUTHOR);
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("GPL");
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