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WSL2-Linux-Kernel
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WSL2-Linux-Kernel/drivers/usb/core/devio.c

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59 KiB
C
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/*****************************************************************************/
/*
* devio.c -- User space communication with USB devices.
*
* Copyright (C) 1999-2000 Thomas Sailer (sailer@ife.ee.ethz.ch)
*
* 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; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*
* This file implements the usbfs/x/y files, where
* x is the bus number and y the device number.
*
* It allows user space programs/"drivers" to communicate directly
* with USB devices without intervening kernel driver.
*
* Revision history
* 22.12.1999 0.1 Initial release (split from proc_usb.c)
* 04.01.2000 0.2 Turned into its own filesystem
* 30.09.2005 0.3 Fix user-triggerable oops in async URB delivery
* (CAN-2005-3055)
*/
/*****************************************************************************/
#include <linux/fs.h>
#include <linux/mm.h>
#include <linux/slab.h>
#include <linux/signal.h>
#include <linux/poll.h>
#include <linux/module.h>
#include <linux/string.h>
#include <linux/usb.h>
#include <linux/usbdevice_fs.h>
#include <linux/usb/hcd.h> /* for usbcore internals */
#include <linux/cdev.h>
#include <linux/notifier.h>
#include <linux/security.h>
#include <linux/user_namespace.h>
#include <linux/scatterlist.h>
#include <linux/uaccess.h>
#include <asm/byteorder.h>
#include <linux/moduleparam.h>
#include "usb.h"
#define USB_MAXBUS 64
#define USB_DEVICE_MAX (USB_MAXBUS * 128)
#define USB_SG_SIZE 16384 /* split-size for large txs */
/* Mutual exclusion for removal, open, and release */
DEFINE_MUTEX(usbfs_mutex);
struct usb_dev_state {
struct list_head list; /* state list */
struct usb_device *dev;
struct file *file;
spinlock_t lock; /* protects the async urb lists */
struct list_head async_pending;
struct list_head async_completed;
wait_queue_head_t wait; /* wake up if a request completed */
unsigned int discsignr;
struct pid *disc_pid;
const struct cred *cred;
void __user *disccontext;
unsigned long ifclaimed;
u32 secid;
u32 disabled_bulk_eps;
};
struct async {
struct list_head asynclist;
struct usb_dev_state *ps;
struct pid *pid;
const struct cred *cred;
unsigned int signr;
unsigned int ifnum;
void __user *userbuffer;
void __user *userurb;
struct urb *urb;
unsigned int mem_usage;
int status;
u32 secid;
u8 bulk_addr;
u8 bulk_status;
};
static bool usbfs_snoop;
module_param(usbfs_snoop, bool, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(usbfs_snoop, "true to log all usbfs traffic");
#define snoop(dev, format, arg...) \
do { \
if (usbfs_snoop) \
dev_info(dev , format , ## arg); \
} while (0)
enum snoop_when {
SUBMIT, COMPLETE
};
#define USB_DEVICE_DEV MKDEV(USB_DEVICE_MAJOR, 0)
/* Limit on the total amount of memory we can allocate for transfers */
static unsigned usbfs_memory_mb = 16;
module_param(usbfs_memory_mb, uint, 0644);
MODULE_PARM_DESC(usbfs_memory_mb,
"maximum MB allowed for usbfs buffers (0 = no limit)");
/* Hard limit, necessary to avoid arithmetic overflow */
#define USBFS_XFER_MAX (UINT_MAX / 2 - 1000000)
static atomic_t usbfs_memory_usage; /* Total memory currently allocated */
/* Check whether it's okay to allocate more memory for a transfer */
static int usbfs_increase_memory_usage(unsigned amount)
{
unsigned lim;
/*
* Convert usbfs_memory_mb to bytes, avoiding overflows.
* 0 means use the hard limit (effectively unlimited).
*/
lim = ACCESS_ONCE(usbfs_memory_mb);
if (lim == 0 || lim > (USBFS_XFER_MAX >> 20))
lim = USBFS_XFER_MAX;
else
lim <<= 20;
atomic_add(amount, &usbfs_memory_usage);
if (atomic_read(&usbfs_memory_usage) <= lim)
return 0;
atomic_sub(amount, &usbfs_memory_usage);
return -ENOMEM;
}
/* Memory for a transfer is being deallocated */
static void usbfs_decrease_memory_usage(unsigned amount)
{
atomic_sub(amount, &usbfs_memory_usage);
}
static int connected(struct usb_dev_state *ps)
{
return (!list_empty(&ps->list) &&
ps->dev->state != USB_STATE_NOTATTACHED);
}
static loff_t usbdev_lseek(struct file *file, loff_t offset, int orig)
{
loff_t ret;
mutex_lock(&file_inode(file)->i_mutex);
switch (orig) {
case 0:
file->f_pos = offset;
ret = file->f_pos;
break;
case 1:
file->f_pos += offset;
ret = file->f_pos;
break;
case 2:
default:
ret = -EINVAL;
}
mutex_unlock(&file_inode(file)->i_mutex);
return ret;
}
static ssize_t usbdev_read(struct file *file, char __user *buf, size_t nbytes,
loff_t *ppos)
{
struct usb_dev_state *ps = file->private_data;
struct usb_device *dev = ps->dev;
ssize_t ret = 0;
unsigned len;
loff_t pos;
int i;
pos = *ppos;
usb_lock_device(dev);
if (!connected(ps)) {
ret = -ENODEV;
goto err;
} else if (pos < 0) {
ret = -EINVAL;
goto err;
}
if (pos < sizeof(struct usb_device_descriptor)) {
/* 18 bytes - fits on the stack */
struct usb_device_descriptor temp_desc;
memcpy(&temp_desc, &dev->descriptor, sizeof(dev->descriptor));
le16_to_cpus(&temp_desc.bcdUSB);
le16_to_cpus(&temp_desc.idVendor);
le16_to_cpus(&temp_desc.idProduct);
le16_to_cpus(&temp_desc.bcdDevice);
len = sizeof(struct usb_device_descriptor) - pos;
if (len > nbytes)
len = nbytes;
if (copy_to_user(buf, ((char *)&temp_desc) + pos, len)) {
ret = -EFAULT;
goto err;
}
*ppos += len;
buf += len;
nbytes -= len;
ret += len;
}
pos = sizeof(struct usb_device_descriptor);
for (i = 0; nbytes && i < dev->descriptor.bNumConfigurations; i++) {
struct usb_config_descriptor *config =
(struct usb_config_descriptor *)dev->rawdescriptors[i];
unsigned int length = le16_to_cpu(config->wTotalLength);
if (*ppos < pos + length) {
/* The descriptor may claim to be longer than it
* really is. Here is the actual allocated length. */
unsigned alloclen =
le16_to_cpu(dev->config[i].desc.wTotalLength);
len = length - (*ppos - pos);
if (len > nbytes)
len = nbytes;
/* Simply don't write (skip over) unallocated parts */
if (alloclen > (*ppos - pos)) {
alloclen -= (*ppos - pos);
if (copy_to_user(buf,
dev->rawdescriptors[i] + (*ppos - pos),
min(len, alloclen))) {
ret = -EFAULT;
goto err;
}
}
*ppos += len;
buf += len;
nbytes -= len;
ret += len;
}
pos += length;
}
err:
usb_unlock_device(dev);
return ret;
}
/*
* async list handling
*/
static struct async *alloc_async(unsigned int numisoframes)
{
struct async *as;
as = kzalloc(sizeof(struct async), GFP_KERNEL);
if (!as)
return NULL;
as->urb = usb_alloc_urb(numisoframes, GFP_KERNEL);
if (!as->urb) {
kfree(as);
return NULL;
}
return as;
}
static void free_async(struct async *as)
{
int i;
put_pid(as->pid);
if (as->cred)
put_cred(as->cred);
for (i = 0; i < as->urb->num_sgs; i++) {
if (sg_page(&as->urb->sg[i]))
kfree(sg_virt(&as->urb->sg[i]));
}
kfree(as->urb->sg);
kfree(as->urb->transfer_buffer);
kfree(as->urb->setup_packet);
usb_free_urb(as->urb);
usbfs_decrease_memory_usage(as->mem_usage);
kfree(as);
}
static void async_newpending(struct async *as)
{
struct usb_dev_state *ps = as->ps;
unsigned long flags;
spin_lock_irqsave(&ps->lock, flags);
list_add_tail(&as->asynclist, &ps->async_pending);
spin_unlock_irqrestore(&ps->lock, flags);
}
static void async_removepending(struct async *as)
{
struct usb_dev_state *ps = as->ps;
unsigned long flags;
spin_lock_irqsave(&ps->lock, flags);
list_del_init(&as->asynclist);
spin_unlock_irqrestore(&ps->lock, flags);
}
static struct async *async_getcompleted(struct usb_dev_state *ps)
{
unsigned long flags;
struct async *as = NULL;
spin_lock_irqsave(&ps->lock, flags);
if (!list_empty(&ps->async_completed)) {
as = list_entry(ps->async_completed.next, struct async,
asynclist);
list_del_init(&as->asynclist);
}
spin_unlock_irqrestore(&ps->lock, flags);
return as;
}
static struct async *async_getpending(struct usb_dev_state *ps,
void __user *userurb)
{
struct async *as;
list_for_each_entry(as, &ps->async_pending, asynclist)
if (as->userurb == userurb) {
list_del_init(&as->asynclist);
return as;
}
return NULL;
}
static void snoop_urb(struct usb_device *udev,
void __user *userurb, int pipe, unsigned length,
int timeout_or_status, enum snoop_when when,
unsigned char *data, unsigned data_len)
{
static const char *types[] = {"isoc", "int", "ctrl", "bulk"};
static const char *dirs[] = {"out", "in"};
int ep;
const char *t, *d;
if (!usbfs_snoop)
return;
ep = usb_pipeendpoint(pipe);
t = types[usb_pipetype(pipe)];
d = dirs[!!usb_pipein(pipe)];
if (userurb) { /* Async */
if (when == SUBMIT)
dev_info(&udev->dev, "userurb %p, ep%d %s-%s, "
"length %u\n",
userurb, ep, t, d, length);
else
dev_info(&udev->dev, "userurb %p, ep%d %s-%s, "
"actual_length %u status %d\n",
userurb, ep, t, d, length,
timeout_or_status);
} else {
if (when == SUBMIT)
dev_info(&udev->dev, "ep%d %s-%s, length %u, "
"timeout %d\n",
ep, t, d, length, timeout_or_status);
else
dev_info(&udev->dev, "ep%d %s-%s, actual_length %u, "
"status %d\n",
ep, t, d, length, timeout_or_status);
}
if (data && data_len > 0) {
print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1,
data, data_len, 1);
}
}
static void snoop_urb_data(struct urb *urb, unsigned len)
{
int i, size;
if (!usbfs_snoop)
return;
if (urb->num_sgs == 0) {
print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1,
urb->transfer_buffer, len, 1);
return;
}
for (i = 0; i < urb->num_sgs && len; i++) {
size = (len > USB_SG_SIZE) ? USB_SG_SIZE : len;
print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1,
sg_virt(&urb->sg[i]), size, 1);
len -= size;
}
}
static int copy_urb_data_to_user(u8 __user *userbuffer, struct urb *urb)
{
unsigned i, len, size;
if (urb->number_of_packets > 0) /* Isochronous */
len = urb->transfer_buffer_length;
else /* Non-Isoc */
len = urb->actual_length;
if (urb->num_sgs == 0) {
if (copy_to_user(userbuffer, urb->transfer_buffer, len))
return -EFAULT;
return 0;
}
for (i = 0; i < urb->num_sgs && len; i++) {
size = (len > USB_SG_SIZE) ? USB_SG_SIZE : len;
if (copy_to_user(userbuffer, sg_virt(&urb->sg[i]), size))
return -EFAULT;
userbuffer += size;
len -= size;
}
return 0;
}
#define AS_CONTINUATION 1
#define AS_UNLINK 2
static void cancel_bulk_urbs(struct usb_dev_state *ps, unsigned bulk_addr)
__releases(ps->lock)
__acquires(ps->lock)
{
struct urb *urb;
struct async *as;
/* Mark all the pending URBs that match bulk_addr, up to but not
* including the first one without AS_CONTINUATION. If such an
* URB is encountered then a new transfer has already started so
* the endpoint doesn't need to be disabled; otherwise it does.
*/
list_for_each_entry(as, &ps->async_pending, asynclist) {
if (as->bulk_addr == bulk_addr) {
if (as->bulk_status != AS_CONTINUATION)
goto rescan;
as->bulk_status = AS_UNLINK;
as->bulk_addr = 0;
}
}
ps->disabled_bulk_eps |= (1 << bulk_addr);
/* Now carefully unlink all the marked pending URBs */
rescan:
list_for_each_entry(as, &ps->async_pending, asynclist) {
if (as->bulk_status == AS_UNLINK) {
as->bulk_status = 0; /* Only once */
urb = as->urb;
usb_get_urb(urb);
spin_unlock(&ps->lock); /* Allow completions */
usb_unlink_urb(urb);
usb_put_urb(urb);
spin_lock(&ps->lock);
goto rescan;
}
}
}
static void async_completed(struct urb *urb)
{
struct async *as = urb->context;
struct usb_dev_state *ps = as->ps;
struct siginfo sinfo;
struct pid *pid = NULL;
u32 secid = 0;
const struct cred *cred = NULL;
int signr;
spin_lock(&ps->lock);
list_move_tail(&as->asynclist, &ps->async_completed);
as->status = urb->status;
signr = as->signr;
if (signr) {
sinfo.si_signo = as->signr;
sinfo.si_errno = as->status;
sinfo.si_code = SI_ASYNCIO;
sinfo.si_addr = as->userurb;
pid = get_pid(as->pid);
cred = get_cred(as->cred);
secid = as->secid;
}
snoop(&urb->dev->dev, "urb complete\n");
snoop_urb(urb->dev, as->userurb, urb->pipe, urb->actual_length,
as->status, COMPLETE, NULL, 0);
if ((urb->transfer_flags & URB_DIR_MASK) == USB_DIR_IN)
snoop_urb_data(urb, urb->actual_length);
if (as->status < 0 && as->bulk_addr && as->status != -ECONNRESET &&
as->status != -ENOENT)
cancel_bulk_urbs(ps, as->bulk_addr);
spin_unlock(&ps->lock);
if (signr) {
kill_pid_info_as_cred(sinfo.si_signo, &sinfo, pid, cred, secid);
put_pid(pid);
put_cred(cred);
}
wake_up(&ps->wait);
}
static void destroy_async(struct usb_dev_state *ps, struct list_head *list)
{
struct urb *urb;
struct async *as;
unsigned long flags;
spin_lock_irqsave(&ps->lock, flags);
while (!list_empty(list)) {
as = list_entry(list->next, struct async, asynclist);
list_del_init(&as->asynclist);
urb = as->urb;
usb_get_urb(urb);
/* drop the spinlock so the completion handler can run */
spin_unlock_irqrestore(&ps->lock, flags);
usb_kill_urb(urb);
usb_put_urb(urb);
spin_lock_irqsave(&ps->lock, flags);
}
spin_unlock_irqrestore(&ps->lock, flags);
}
static void destroy_async_on_interface(struct usb_dev_state *ps,
unsigned int ifnum)
{
struct list_head *p, *q, hitlist;
unsigned long flags;
INIT_LIST_HEAD(&hitlist);
spin_lock_irqsave(&ps->lock, flags);
list_for_each_safe(p, q, &ps->async_pending)
if (ifnum == list_entry(p, struct async, asynclist)->ifnum)
list_move_tail(p, &hitlist);
spin_unlock_irqrestore(&ps->lock, flags);
destroy_async(ps, &hitlist);
}
static void destroy_all_async(struct usb_dev_state *ps)
{
destroy_async(ps, &ps->async_pending);
}
/*
* interface claims are made only at the request of user level code,
* which can also release them (explicitly or by closing files).
* they're also undone when devices disconnect.
*/
static int driver_probe(struct usb_interface *intf,
const struct usb_device_id *id)
{
return -ENODEV;
}
static void driver_disconnect(struct usb_interface *intf)
{
struct usb_dev_state *ps = usb_get_intfdata(intf);
unsigned int ifnum = intf->altsetting->desc.bInterfaceNumber;
if (!ps)
return;
/* NOTE: this relies on usbcore having canceled and completed
* all pending I/O requests; 2.6 does that.
*/
if (likely(ifnum < 8*sizeof(ps->ifclaimed)))
clear_bit(ifnum, &ps->ifclaimed);
else
dev_warn(&intf->dev, "interface number %u out of range\n",
ifnum);
usb_set_intfdata(intf, NULL);
/* force async requests to complete */
destroy_async_on_interface(ps, ifnum);
}
/* The following routines are merely placeholders. There is no way
* to inform a user task about suspend or resumes.
*/
static int driver_suspend(struct usb_interface *intf, pm_message_t msg)
{
return 0;
}
static int driver_resume(struct usb_interface *intf)
{
return 0;
}
struct usb_driver usbfs_driver = {
.name = "usbfs",
.probe = driver_probe,
.disconnect = driver_disconnect,
.suspend = driver_suspend,
.resume = driver_resume,
};
static int claimintf(struct usb_dev_state *ps, unsigned int ifnum)
{
struct usb_device *dev = ps->dev;
struct usb_interface *intf;
int err;
if (ifnum >= 8*sizeof(ps->ifclaimed))
return -EINVAL;
/* already claimed */
if (test_bit(ifnum, &ps->ifclaimed))
return 0;
intf = usb_ifnum_to_if(dev, ifnum);
if (!intf)
err = -ENOENT;
else
err = usb_driver_claim_interface(&usbfs_driver, intf, ps);
if (err == 0)
set_bit(ifnum, &ps->ifclaimed);
return err;
}
static int releaseintf(struct usb_dev_state *ps, unsigned int ifnum)
{
struct usb_device *dev;
struct usb_interface *intf;
int err;
err = -EINVAL;
if (ifnum >= 8*sizeof(ps->ifclaimed))
return err;
dev = ps->dev;
intf = usb_ifnum_to_if(dev, ifnum);
if (!intf)
err = -ENOENT;
else if (test_and_clear_bit(ifnum, &ps->ifclaimed)) {
usb_driver_release_interface(&usbfs_driver, intf);
err = 0;
}
return err;
}
static int checkintf(struct usb_dev_state *ps, unsigned int ifnum)
{
if (ps->dev->state != USB_STATE_CONFIGURED)
return -EHOSTUNREACH;
if (ifnum >= 8*sizeof(ps->ifclaimed))
return -EINVAL;
if (test_bit(ifnum, &ps->ifclaimed))
return 0;
/* if not yet claimed, claim it for the driver */
dev_warn(&ps->dev->dev, "usbfs: process %d (%s) did not claim "
"interface %u before use\n", task_pid_nr(current),
current->comm, ifnum);
return claimintf(ps, ifnum);
}
static int findintfep(struct usb_device *dev, unsigned int ep)
{
unsigned int i, j, e;
struct usb_interface *intf;
struct usb_host_interface *alts;
struct usb_endpoint_descriptor *endpt;
if (ep & ~(USB_DIR_IN|0xf))
return -EINVAL;
if (!dev->actconfig)
return -ESRCH;
for (i = 0; i < dev->actconfig->desc.bNumInterfaces; i++) {
intf = dev->actconfig->interface[i];
for (j = 0; j < intf->num_altsetting; j++) {
alts = &intf->altsetting[j];
for (e = 0; e < alts->desc.bNumEndpoints; e++) {
endpt = &alts->endpoint[e].desc;
if (endpt->bEndpointAddress == ep)
return alts->desc.bInterfaceNumber;
}
}
}
return -ENOENT;
}
static int check_ctrlrecip(struct usb_dev_state *ps, unsigned int requesttype,
unsigned int request, unsigned int index)
{
int ret = 0;
struct usb_host_interface *alt_setting;
if (ps->dev->state != USB_STATE_UNAUTHENTICATED
&& ps->dev->state != USB_STATE_ADDRESS
&& ps->dev->state != USB_STATE_CONFIGURED)
return -EHOSTUNREACH;
if (USB_TYPE_VENDOR == (USB_TYPE_MASK & requesttype))
return 0;
/*
* check for the special corner case 'get_device_id' in the printer
* class specification, which we always want to allow as it is used
* to query things like ink level, etc.
*/
if (requesttype == 0xa1 && request == 0) {
alt_setting = usb_find_alt_setting(ps->dev->actconfig,
index >> 8, index & 0xff);
if (alt_setting
&& alt_setting->desc.bInterfaceClass == USB_CLASS_PRINTER)
return 0;
}
index &= 0xff;
switch (requesttype & USB_RECIP_MASK) {
case USB_RECIP_ENDPOINT:
if ((index & ~USB_DIR_IN) == 0)
return 0;
ret = findintfep(ps->dev, index);
if (ret < 0) {
/*
* Some not fully compliant Win apps seem to get
* index wrong and have the endpoint number here
* rather than the endpoint address (with the
* correct direction). Win does let this through,
* so we'll not reject it here but leave it to
* the device to not break KVM. But we warn.
*/
ret = findintfep(ps->dev, index ^ 0x80);
if (ret >= 0)
dev_info(&ps->dev->dev,
"%s: process %i (%s) requesting ep %02x but needs %02x\n",
__func__, task_pid_nr(current),
current->comm, index, index ^ 0x80);
}
if (ret >= 0)
ret = checkintf(ps, ret);
break;
case USB_RECIP_INTERFACE:
ret = checkintf(ps, index);
break;
}
return ret;
}
static struct usb_host_endpoint *ep_to_host_endpoint(struct usb_device *dev,
unsigned char ep)
{
if (ep & USB_ENDPOINT_DIR_MASK)
return dev->ep_in[ep & USB_ENDPOINT_NUMBER_MASK];
else
return dev->ep_out[ep & USB_ENDPOINT_NUMBER_MASK];
}
static int parse_usbdevfs_streams(struct usb_dev_state *ps,
struct usbdevfs_streams __user *streams,
unsigned int *num_streams_ret,
unsigned int *num_eps_ret,
struct usb_host_endpoint ***eps_ret,
struct usb_interface **intf_ret)
{
unsigned int i, num_streams, num_eps;
struct usb_host_endpoint **eps;
struct usb_interface *intf = NULL;
unsigned char ep;
int ifnum, ret;
if (get_user(num_streams, &streams->num_streams) ||
get_user(num_eps, &streams->num_eps))
return -EFAULT;
if (num_eps < 1 || num_eps > USB_MAXENDPOINTS)
return -EINVAL;
/* The XHCI controller allows max 2 ^ 16 streams */
if (num_streams_ret && (num_streams < 2 || num_streams > 65536))
return -EINVAL;
eps = kmalloc(num_eps * sizeof(*eps), GFP_KERNEL);
if (!eps)
return -ENOMEM;
for (i = 0; i < num_eps; i++) {
if (get_user(ep, &streams->eps[i])) {
ret = -EFAULT;
goto error;
}
eps[i] = ep_to_host_endpoint(ps->dev, ep);
if (!eps[i]) {
ret = -EINVAL;
goto error;
}
/* usb_alloc/free_streams operate on an usb_interface */
ifnum = findintfep(ps->dev, ep);
if (ifnum < 0) {
ret = ifnum;
goto error;
}
if (i == 0) {
ret = checkintf(ps, ifnum);
if (ret < 0)
goto error;
intf = usb_ifnum_to_if(ps->dev, ifnum);
} else {
/* Verify all eps belong to the same interface */
if (ifnum != intf->altsetting->desc.bInterfaceNumber) {
ret = -EINVAL;
goto error;
}
}
}
if (num_streams_ret)
*num_streams_ret = num_streams;
*num_eps_ret = num_eps;
*eps_ret = eps;
*intf_ret = intf;
return 0;
error:
kfree(eps);
return ret;
}
static int match_devt(struct device *dev, void *data)
{
return dev->devt == (dev_t) (unsigned long) data;
}
static struct usb_device *usbdev_lookup_by_devt(dev_t devt)
{
struct device *dev;
dev = bus_find_device(&usb_bus_type, NULL,
(void *) (unsigned long) devt, match_devt);
if (!dev)
return NULL;
return container_of(dev, struct usb_device, dev);
}
/*
* file operations
*/
static int usbdev_open(struct inode *inode, struct file *file)
{
struct usb_device *dev = NULL;
struct usb_dev_state *ps;
int ret;
ret = -ENOMEM;
ps = kmalloc(sizeof(struct usb_dev_state), GFP_KERNEL);
if (!ps)
goto out_free_ps;
ret = -ENODEV;
/* Protect against simultaneous removal or release */
mutex_lock(&usbfs_mutex);
/* usbdev device-node */
if (imajor(inode) == USB_DEVICE_MAJOR)
dev = usbdev_lookup_by_devt(inode->i_rdev);
mutex_unlock(&usbfs_mutex);
if (!dev)
goto out_free_ps;
usb_lock_device(dev);
if (dev->state == USB_STATE_NOTATTACHED)
goto out_unlock_device;
ret = usb_autoresume_device(dev);
if (ret)
goto out_unlock_device;
ps->dev = dev;
ps->file = file;
spin_lock_init(&ps->lock);
INIT_LIST_HEAD(&ps->list);
INIT_LIST_HEAD(&ps->async_pending);
INIT_LIST_HEAD(&ps->async_completed);
init_waitqueue_head(&ps->wait);
ps->discsignr = 0;
ps->disc_pid = get_pid(task_pid(current));
ps->cred = get_current_cred();
ps->disccontext = NULL;
ps->ifclaimed = 0;
security_task_getsecid(current, &ps->secid);
smp_wmb();
list_add_tail(&ps->list, &dev->filelist);
file->private_data = ps;
usb_unlock_device(dev);
snoop(&dev->dev, "opened by process %d: %s\n", task_pid_nr(current),
current->comm);
return ret;
out_unlock_device:
usb_unlock_device(dev);
usb_put_dev(dev);
out_free_ps:
kfree(ps);
return ret;
}
static int usbdev_release(struct inode *inode, struct file *file)
{
struct usb_dev_state *ps = file->private_data;
struct usb_device *dev = ps->dev;
unsigned int ifnum;
struct async *as;
usb_lock_device(dev);
usb_hub_release_all_ports(dev, ps);
list_del_init(&ps->list);
for (ifnum = 0; ps->ifclaimed && ifnum < 8*sizeof(ps->ifclaimed);
ifnum++) {
if (test_bit(ifnum, &ps->ifclaimed))
releaseintf(ps, ifnum);
}
destroy_all_async(ps);
usb_autosuspend_device(dev);
usb_unlock_device(dev);
usb_put_dev(dev);
put_pid(ps->disc_pid);
put_cred(ps->cred);
as = async_getcompleted(ps);
while (as) {
free_async(as);
as = async_getcompleted(ps);
}
kfree(ps);
return 0;
}
static int proc_control(struct usb_dev_state *ps, void __user *arg)
{
struct usb_device *dev = ps->dev;
struct usbdevfs_ctrltransfer ctrl;
unsigned int tmo;
unsigned char *tbuf;
unsigned wLength;
int i, pipe, ret;
if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
return -EFAULT;
ret = check_ctrlrecip(ps, ctrl.bRequestType, ctrl.bRequest,
ctrl.wIndex);
if (ret)
return ret;
wLength = ctrl.wLength; /* To suppress 64k PAGE_SIZE warning */
if (wLength > PAGE_SIZE)
return -EINVAL;
ret = usbfs_increase_memory_usage(PAGE_SIZE + sizeof(struct urb) +
sizeof(struct usb_ctrlrequest));
if (ret)
return ret;
tbuf = (unsigned char *)__get_free_page(GFP_KERNEL);
if (!tbuf) {
ret = -ENOMEM;
goto done;
}
tmo = ctrl.timeout;
snoop(&dev->dev, "control urb: bRequestType=%02x "
"bRequest=%02x wValue=%04x "
"wIndex=%04x wLength=%04x\n",
ctrl.bRequestType, ctrl.bRequest, ctrl.wValue,
ctrl.wIndex, ctrl.wLength);
if (ctrl.bRequestType & 0x80) {
if (ctrl.wLength && !access_ok(VERIFY_WRITE, ctrl.data,
ctrl.wLength)) {
ret = -EINVAL;
goto done;
}
pipe = usb_rcvctrlpipe(dev, 0);
snoop_urb(dev, NULL, pipe, ctrl.wLength, tmo, SUBMIT, NULL, 0);
usb_unlock_device(dev);
i = usb_control_msg(dev, pipe, ctrl.bRequest,
ctrl.bRequestType, ctrl.wValue, ctrl.wIndex,
tbuf, ctrl.wLength, tmo);
usb_lock_device(dev);
snoop_urb(dev, NULL, pipe, max(i, 0), min(i, 0), COMPLETE,
tbuf, max(i, 0));
if ((i > 0) && ctrl.wLength) {
if (copy_to_user(ctrl.data, tbuf, i)) {
ret = -EFAULT;
goto done;
}
}
} else {
if (ctrl.wLength) {
if (copy_from_user(tbuf, ctrl.data, ctrl.wLength)) {
ret = -EFAULT;
goto done;
}
}
pipe = usb_sndctrlpipe(dev, 0);
snoop_urb(dev, NULL, pipe, ctrl.wLength, tmo, SUBMIT,
tbuf, ctrl.wLength);
usb_unlock_device(dev);
i = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), ctrl.bRequest,
ctrl.bRequestType, ctrl.wValue, ctrl.wIndex,
tbuf, ctrl.wLength, tmo);
usb_lock_device(dev);
snoop_urb(dev, NULL, pipe, max(i, 0), min(i, 0), COMPLETE, NULL, 0);
}
if (i < 0 && i != -EPIPE) {
dev_printk(KERN_DEBUG, &dev->dev, "usbfs: USBDEVFS_CONTROL "
"failed cmd %s rqt %u rq %u len %u ret %d\n",
current->comm, ctrl.bRequestType, ctrl.bRequest,
ctrl.wLength, i);
}
ret = i;
done:
free_page((unsigned long) tbuf);
usbfs_decrease_memory_usage(PAGE_SIZE + sizeof(struct urb) +
sizeof(struct usb_ctrlrequest));
return ret;
}
static int proc_bulk(struct usb_dev_state *ps, void __user *arg)
{
struct usb_device *dev = ps->dev;
struct usbdevfs_bulktransfer bulk;
unsigned int tmo, len1, pipe;
int len2;
unsigned char *tbuf;
int i, ret;
if (copy_from_user(&bulk, arg, sizeof(bulk)))
return -EFAULT;
ret = findintfep(ps->dev, bulk.ep);
if (ret < 0)
return ret;
ret = checkintf(ps, ret);
if (ret)
return ret;
if (bulk.ep & USB_DIR_IN)
pipe = usb_rcvbulkpipe(dev, bulk.ep & 0x7f);
else
pipe = usb_sndbulkpipe(dev, bulk.ep & 0x7f);
if (!usb_maxpacket(dev, pipe, !(bulk.ep & USB_DIR_IN)))
return -EINVAL;
len1 = bulk.len;
if (len1 >= USBFS_XFER_MAX)
return -EINVAL;
ret = usbfs_increase_memory_usage(len1 + sizeof(struct urb));
if (ret)
return ret;
if (!(tbuf = kmalloc(len1, GFP_KERNEL))) {
ret = -ENOMEM;
goto done;
}
tmo = bulk.timeout;
if (bulk.ep & 0x80) {
if (len1 && !access_ok(VERIFY_WRITE, bulk.data, len1)) {
ret = -EINVAL;
goto done;
}
snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT, NULL, 0);
usb_unlock_device(dev);
i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
usb_lock_device(dev);
snoop_urb(dev, NULL, pipe, len2, i, COMPLETE, tbuf, len2);
if (!i && len2) {
if (copy_to_user(bulk.data, tbuf, len2)) {
ret = -EFAULT;
goto done;
}
}
} else {
if (len1) {
if (copy_from_user(tbuf, bulk.data, len1)) {
ret = -EFAULT;
goto done;
}
}
snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT, tbuf, len1);
usb_unlock_device(dev);
i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
usb_lock_device(dev);
snoop_urb(dev, NULL, pipe, len2, i, COMPLETE, NULL, 0);
}
ret = (i < 0 ? i : len2);
done:
kfree(tbuf);
usbfs_decrease_memory_usage(len1 + sizeof(struct urb));
return ret;
}
static void check_reset_of_active_ep(struct usb_device *udev,
unsigned int epnum, char *ioctl_name)
{
struct usb_host_endpoint **eps;
struct usb_host_endpoint *ep;
eps = (epnum & USB_DIR_IN) ? udev->ep_in : udev->ep_out;
ep = eps[epnum & 0x0f];
if (ep && !list_empty(&ep->urb_list))
dev_warn(&udev->dev, "Process %d (%s) called USBDEVFS_%s for active endpoint 0x%02x\n",
task_pid_nr(current), current->comm,
ioctl_name, epnum);
}
static int proc_resetep(struct usb_dev_state *ps, void __user *arg)
{
unsigned int ep;
int ret;
if (get_user(ep, (unsigned int __user *)arg))
return -EFAULT;
ret = findintfep(ps->dev, ep);
if (ret < 0)
return ret;
ret = checkintf(ps, ret);
if (ret)
return ret;
check_reset_of_active_ep(ps->dev, ep, "RESETEP");
usb_reset_endpoint(ps->dev, ep);
return 0;
}
static int proc_clearhalt(struct usb_dev_state *ps, void __user *arg)
{
unsigned int ep;
int pipe;
int ret;
if (get_user(ep, (unsigned int __user *)arg))
return -EFAULT;
ret = findintfep(ps->dev, ep);
if (ret < 0)
return ret;
ret = checkintf(ps, ret);
if (ret)
return ret;
check_reset_of_active_ep(ps->dev, ep, "CLEAR_HALT");
if (ep & USB_DIR_IN)
pipe = usb_rcvbulkpipe(ps->dev, ep & 0x7f);
else
pipe = usb_sndbulkpipe(ps->dev, ep & 0x7f);
return usb_clear_halt(ps->dev, pipe);
}
static int proc_getdriver(struct usb_dev_state *ps, void __user *arg)
{
struct usbdevfs_getdriver gd;
struct usb_interface *intf;
int ret;
if (copy_from_user(&gd, arg, sizeof(gd)))
return -EFAULT;
intf = usb_ifnum_to_if(ps->dev, gd.interface);
if (!intf || !intf->dev.driver)
ret = -ENODATA;
else {
strlcpy(gd.driver, intf->dev.driver->name,
sizeof(gd.driver));
ret = (copy_to_user(arg, &gd, sizeof(gd)) ? -EFAULT : 0);
}
return ret;
}
static int proc_connectinfo(struct usb_dev_state *ps, void __user *arg)
{
struct usbdevfs_connectinfo ci = {
.devnum = ps->dev->devnum,
.slow = ps->dev->speed == USB_SPEED_LOW
};
if (copy_to_user(arg, &ci, sizeof(ci)))
return -EFAULT;
return 0;
}
static int proc_resetdevice(struct usb_dev_state *ps)
{
return usb_reset_device(ps->dev);
}
static int proc_setintf(struct usb_dev_state *ps, void __user *arg)
{
struct usbdevfs_setinterface setintf;
int ret;
if (copy_from_user(&setintf, arg, sizeof(setintf)))
return -EFAULT;
if ((ret = checkintf(ps, setintf.interface)))
return ret;
destroy_async_on_interface(ps, setintf.interface);
return usb_set_interface(ps->dev, setintf.interface,
setintf.altsetting);
}
static int proc_setconfig(struct usb_dev_state *ps, void __user *arg)
{
int u;
int status = 0;
struct usb_host_config *actconfig;
if (get_user(u, (int __user *)arg))
return -EFAULT;
actconfig = ps->dev->actconfig;
/* Don't touch the device if any interfaces are claimed.
* It could interfere with other drivers' operations, and if
* an interface is claimed by usbfs it could easily deadlock.
*/
if (actconfig) {
int i;
for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) {
if (usb_interface_claimed(actconfig->interface[i])) {
dev_warn(&ps->dev->dev,
"usbfs: interface %d claimed by %s "
"while '%s' sets config #%d\n",
actconfig->interface[i]
->cur_altsetting
->desc.bInterfaceNumber,
actconfig->interface[i]
->dev.driver->name,
current->comm, u);
status = -EBUSY;
break;
}
}
}
/* SET_CONFIGURATION is often abused as a "cheap" driver reset,
* so avoid usb_set_configuration()'s kick to sysfs
*/
if (status == 0) {
if (actconfig && actconfig->desc.bConfigurationValue == u)
status = usb_reset_configuration(ps->dev);
else
status = usb_set_configuration(ps->dev, u);
}
return status;
}
static int proc_do_submiturb(struct usb_dev_state *ps, struct usbdevfs_urb *uurb,
struct usbdevfs_iso_packet_desc __user *iso_frame_desc,
void __user *arg)
{
struct usbdevfs_iso_packet_desc *isopkt = NULL;
struct usb_host_endpoint *ep;
struct async *as = NULL;
struct usb_ctrlrequest *dr = NULL;
unsigned int u, totlen, isofrmlen;
int i, ret, is_in, num_sgs = 0, ifnum = -1;
int number_of_packets = 0;
unsigned int stream_id = 0;
void *buf;
if (uurb->flags & ~(USBDEVFS_URB_ISO_ASAP |
USBDEVFS_URB_SHORT_NOT_OK |
USBDEVFS_URB_BULK_CONTINUATION |
USBDEVFS_URB_NO_FSBR |
USBDEVFS_URB_ZERO_PACKET |
USBDEVFS_URB_NO_INTERRUPT))
return -EINVAL;
if (uurb->buffer_length > 0 && !uurb->buffer)
return -EINVAL;
if (!(uurb->type == USBDEVFS_URB_TYPE_CONTROL &&
(uurb->endpoint & ~USB_ENDPOINT_DIR_MASK) == 0)) {
ifnum = findintfep(ps->dev, uurb->endpoint);
if (ifnum < 0)
return ifnum;
ret = checkintf(ps, ifnum);
if (ret)
return ret;
}
ep = ep_to_host_endpoint(ps->dev, uurb->endpoint);
if (!ep)
return -ENOENT;
is_in = (uurb->endpoint & USB_ENDPOINT_DIR_MASK) != 0;
u = 0;
switch(uurb->type) {
case USBDEVFS_URB_TYPE_CONTROL:
if (!usb_endpoint_xfer_control(&ep->desc))
return -EINVAL;
/* min 8 byte setup packet */
if (uurb->buffer_length < 8)
return -EINVAL;
dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL);
if (!dr)
return -ENOMEM;
if (copy_from_user(dr, uurb->buffer, 8)) {
ret = -EFAULT;
goto error;
}
if (uurb->buffer_length < (le16_to_cpup(&dr->wLength) + 8)) {
ret = -EINVAL;
goto error;
}
ret = check_ctrlrecip(ps, dr->bRequestType, dr->bRequest,
le16_to_cpup(&dr->wIndex));
if (ret)
goto error;
uurb->buffer_length = le16_to_cpup(&dr->wLength);
uurb->buffer += 8;
if ((dr->bRequestType & USB_DIR_IN) && uurb->buffer_length) {
is_in = 1;
uurb->endpoint |= USB_DIR_IN;
} else {
is_in = 0;
uurb->endpoint &= ~USB_DIR_IN;
}
snoop(&ps->dev->dev, "control urb: bRequestType=%02x "
"bRequest=%02x wValue=%04x "
"wIndex=%04x wLength=%04x\n",
dr->bRequestType, dr->bRequest,
__le16_to_cpup(&dr->wValue),
__le16_to_cpup(&dr->wIndex),
__le16_to_cpup(&dr->wLength));
u = sizeof(struct usb_ctrlrequest);
break;
case USBDEVFS_URB_TYPE_BULK:
switch (usb_endpoint_type(&ep->desc)) {
case USB_ENDPOINT_XFER_CONTROL:
case USB_ENDPOINT_XFER_ISOC:
return -EINVAL;
case USB_ENDPOINT_XFER_INT:
/* allow single-shot interrupt transfers */
uurb->type = USBDEVFS_URB_TYPE_INTERRUPT;
goto interrupt_urb;
}
num_sgs = DIV_ROUND_UP(uurb->buffer_length, USB_SG_SIZE);
if (num_sgs == 1 || num_sgs > ps->dev->bus->sg_tablesize)
num_sgs = 0;
if (ep->streams)
stream_id = uurb->stream_id;
break;
case USBDEVFS_URB_TYPE_INTERRUPT:
if (!usb_endpoint_xfer_int(&ep->desc))
return -EINVAL;
interrupt_urb:
break;
case USBDEVFS_URB_TYPE_ISO:
/* arbitrary limit */
if (uurb->number_of_packets < 1 ||
uurb->number_of_packets > 128)
return -EINVAL;
if (!usb_endpoint_xfer_isoc(&ep->desc))
return -EINVAL;
number_of_packets = uurb->number_of_packets;
isofrmlen = sizeof(struct usbdevfs_iso_packet_desc) *
number_of_packets;
if (!(isopkt = kmalloc(isofrmlen, GFP_KERNEL)))
return -ENOMEM;
if (copy_from_user(isopkt, iso_frame_desc, isofrmlen)) {
ret = -EFAULT;
goto error;
}
for (totlen = u = 0; u < number_of_packets; u++) {
/*
* arbitrary limit need for USB 3.0
* bMaxBurst (0~15 allowed, 1~16 packets)
* bmAttributes (bit 1:0, mult 0~2, 1~3 packets)
* sizemax: 1024 * 16 * 3 = 49152
*/
if (isopkt[u].length > 49152) {
ret = -EINVAL;
goto error;
}
totlen += isopkt[u].length;
}
u *= sizeof(struct usb_iso_packet_descriptor);
uurb->buffer_length = totlen;
break;
default:
return -EINVAL;
}
if (uurb->buffer_length >= USBFS_XFER_MAX) {
ret = -EINVAL;
goto error;
}
if (uurb->buffer_length > 0 &&
!access_ok(is_in ? VERIFY_WRITE : VERIFY_READ,
uurb->buffer, uurb->buffer_length)) {
ret = -EFAULT;
goto error;
}
as = alloc_async(number_of_packets);
if (!as) {
ret = -ENOMEM;
goto error;
}
u += sizeof(struct async) + sizeof(struct urb) + uurb->buffer_length +
num_sgs * sizeof(struct scatterlist);
ret = usbfs_increase_memory_usage(u);
if (ret)
goto error;
as->mem_usage = u;
if (num_sgs) {
as->urb->sg = kmalloc(num_sgs * sizeof(struct scatterlist),
GFP_KERNEL);
if (!as->urb->sg) {
ret = -ENOMEM;
goto error;
}
as->urb->num_sgs = num_sgs;
sg_init_table(as->urb->sg, as->urb->num_sgs);
totlen = uurb->buffer_length;
for (i = 0; i < as->urb->num_sgs; i++) {
u = (totlen > USB_SG_SIZE) ? USB_SG_SIZE : totlen;
buf = kmalloc(u, GFP_KERNEL);
if (!buf) {
ret = -ENOMEM;
goto error;
}
sg_set_buf(&as->urb->sg[i], buf, u);
if (!is_in) {
if (copy_from_user(buf, uurb->buffer, u)) {
ret = -EFAULT;
goto error;
}
uurb->buffer += u;
}
totlen -= u;
}
} else if (uurb->buffer_length > 0) {
as->urb->transfer_buffer = kmalloc(uurb->buffer_length,
GFP_KERNEL);
if (!as->urb->transfer_buffer) {
ret = -ENOMEM;
goto error;
}
if (!is_in) {
if (copy_from_user(as->urb->transfer_buffer,
uurb->buffer,
uurb->buffer_length)) {
ret = -EFAULT;
goto error;
}
} else if (uurb->type == USBDEVFS_URB_TYPE_ISO) {
/*
* Isochronous input data may end up being
* discontiguous if some of the packets are short.
* Clear the buffer so that the gaps don't leak
* kernel data to userspace.
*/
memset(as->urb->transfer_buffer, 0,
uurb->buffer_length);
}
}
as->urb->dev = ps->dev;
as->urb->pipe = (uurb->type << 30) |
__create_pipe(ps->dev, uurb->endpoint & 0xf) |
(uurb->endpoint & USB_DIR_IN);
/* This tedious sequence is necessary because the URB_* flags
* are internal to the kernel and subject to change, whereas
* the USBDEVFS_URB_* flags are a user API and must not be changed.
*/
u = (is_in ? URB_DIR_IN : URB_DIR_OUT);
if (uurb->flags & USBDEVFS_URB_ISO_ASAP)
u |= URB_ISO_ASAP;
if (uurb->flags & USBDEVFS_URB_SHORT_NOT_OK && is_in)
u |= URB_SHORT_NOT_OK;
if (uurb->flags & USBDEVFS_URB_NO_FSBR)
u |= URB_NO_FSBR;
if (uurb->flags & USBDEVFS_URB_ZERO_PACKET)
u |= URB_ZERO_PACKET;
if (uurb->flags & USBDEVFS_URB_NO_INTERRUPT)
u |= URB_NO_INTERRUPT;
as->urb->transfer_flags = u;
as->urb->transfer_buffer_length = uurb->buffer_length;
as->urb->setup_packet = (unsigned char *)dr;
dr = NULL;
as->urb->start_frame = uurb->start_frame;
as->urb->number_of_packets = number_of_packets;
as->urb->stream_id = stream_id;
if (uurb->type == USBDEVFS_URB_TYPE_ISO ||
ps->dev->speed == USB_SPEED_HIGH)
as->urb->interval = 1 << min(15, ep->desc.bInterval - 1);
else
as->urb->interval = ep->desc.bInterval;
as->urb->context = as;
as->urb->complete = async_completed;
for (totlen = u = 0; u < number_of_packets; u++) {
as->urb->iso_frame_desc[u].offset = totlen;
as->urb->iso_frame_desc[u].length = isopkt[u].length;
totlen += isopkt[u].length;
}
kfree(isopkt);
isopkt = NULL;
as->ps = ps;
as->userurb = arg;
if (is_in && uurb->buffer_length > 0)
as->userbuffer = uurb->buffer;
else
as->userbuffer = NULL;
as->signr = uurb->signr;
as->ifnum = ifnum;
as->pid = get_pid(task_pid(current));
as->cred = get_current_cred();
security_task_getsecid(current, &as->secid);
snoop_urb(ps->dev, as->userurb, as->urb->pipe,
as->urb->transfer_buffer_length, 0, SUBMIT,
NULL, 0);
if (!is_in)
snoop_urb_data(as->urb, as->urb->transfer_buffer_length);
async_newpending(as);
if (usb_endpoint_xfer_bulk(&ep->desc)) {
spin_lock_irq(&ps->lock);
/* Not exactly the endpoint address; the direction bit is
* shifted to the 0x10 position so that the value will be
* between 0 and 31.
*/
as->bulk_addr = usb_endpoint_num(&ep->desc) |
((ep->desc.bEndpointAddress & USB_ENDPOINT_DIR_MASK)
>> 3);
/* If this bulk URB is the start of a new transfer, re-enable
* the endpoint. Otherwise mark it as a continuation URB.
*/
if (uurb->flags & USBDEVFS_URB_BULK_CONTINUATION)
as->bulk_status = AS_CONTINUATION;
else
ps->disabled_bulk_eps &= ~(1 << as->bulk_addr);
/* Don't accept continuation URBs if the endpoint is
* disabled because of an earlier error.
*/
if (ps->disabled_bulk_eps & (1 << as->bulk_addr))
ret = -EREMOTEIO;
else
ret = usb_submit_urb(as->urb, GFP_ATOMIC);
spin_unlock_irq(&ps->lock);
} else {
ret = usb_submit_urb(as->urb, GFP_KERNEL);
}
if (ret) {
dev_printk(KERN_DEBUG, &ps->dev->dev,
"usbfs: usb_submit_urb returned %d\n", ret);
snoop_urb(ps->dev, as->userurb, as->urb->pipe,
0, ret, COMPLETE, NULL, 0);
async_removepending(as);
goto error;
}
return 0;
error:
kfree(isopkt);
kfree(dr);
if (as)
free_async(as);
return ret;
}
static int proc_submiturb(struct usb_dev_state *ps, void __user *arg)
{
struct usbdevfs_urb uurb;
if (copy_from_user(&uurb, arg, sizeof(uurb)))
return -EFAULT;
return proc_do_submiturb(ps, &uurb,
(((struct usbdevfs_urb __user *)arg)->iso_frame_desc),
arg);
}
static int proc_unlinkurb(struct usb_dev_state *ps, void __user *arg)
{
struct urb *urb;
struct async *as;
unsigned long flags;
spin_lock_irqsave(&ps->lock, flags);
as = async_getpending(ps, arg);
if (!as) {
spin_unlock_irqrestore(&ps->lock, flags);
return -EINVAL;
}
urb = as->urb;
usb_get_urb(urb);
spin_unlock_irqrestore(&ps->lock, flags);
usb_kill_urb(urb);
usb_put_urb(urb);
return 0;
}
static int processcompl(struct async *as, void __user * __user *arg)
{
struct urb *urb = as->urb;
struct usbdevfs_urb __user *userurb = as->userurb;
void __user *addr = as->userurb;
unsigned int i;
if (as->userbuffer && urb->actual_length) {
if (copy_urb_data_to_user(as->userbuffer, urb))
goto err_out;
}
if (put_user(as->status, &userurb->status))
goto err_out;
if (put_user(urb->actual_length, &userurb->actual_length))
goto err_out;
if (put_user(urb->error_count, &userurb->error_count))
goto err_out;
if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
for (i = 0; i < urb->number_of_packets; i++) {
if (put_user(urb->iso_frame_desc[i].actual_length,
&userurb->iso_frame_desc[i].actual_length))
goto err_out;
if (put_user(urb->iso_frame_desc[i].status,
&userurb->iso_frame_desc[i].status))
goto err_out;
}
}
if (put_user(addr, (void __user * __user *)arg))
return -EFAULT;
return 0;
err_out:
return -EFAULT;
}
static struct async *reap_as(struct usb_dev_state *ps)
{
DECLARE_WAITQUEUE(wait, current);
struct async *as = NULL;
struct usb_device *dev = ps->dev;
add_wait_queue(&ps->wait, &wait);
for (;;) {
__set_current_state(TASK_INTERRUPTIBLE);
as = async_getcompleted(ps);
if (as)
break;
if (signal_pending(current))
break;
usb_unlock_device(dev);
schedule();
usb_lock_device(dev);
}
remove_wait_queue(&ps->wait, &wait);
set_current_state(TASK_RUNNING);
return as;
}
static int proc_reapurb(struct usb_dev_state *ps, void __user *arg)
{
struct async *as = reap_as(ps);
if (as) {
int retval = processcompl(as, (void __user * __user *)arg);
free_async(as);
return retval;
}
if (signal_pending(current))
return -EINTR;
return -EIO;
}
static int proc_reapurbnonblock(struct usb_dev_state *ps, void __user *arg)
{
int retval;
struct async *as;
as = async_getcompleted(ps);
retval = -EAGAIN;
if (as) {
retval = processcompl(as, (void __user * __user *)arg);
free_async(as);
}
return retval;
}
#ifdef CONFIG_COMPAT
static int proc_control_compat(struct usb_dev_state *ps,
struct usbdevfs_ctrltransfer32 __user *p32)
{
struct usbdevfs_ctrltransfer __user *p;
__u32 udata;
p = compat_alloc_user_space(sizeof(*p));
if (copy_in_user(p, p32, (sizeof(*p32) - sizeof(compat_caddr_t))) ||
get_user(udata, &p32->data) ||
put_user(compat_ptr(udata), &p->data))
return -EFAULT;
return proc_control(ps, p);
}
static int proc_bulk_compat(struct usb_dev_state *ps,
struct usbdevfs_bulktransfer32 __user *p32)
{
struct usbdevfs_bulktransfer __user *p;
compat_uint_t n;
compat_caddr_t addr;
p = compat_alloc_user_space(sizeof(*p));
if (get_user(n, &p32->ep) || put_user(n, &p->ep) ||
get_user(n, &p32->len) || put_user(n, &p->len) ||
get_user(n, &p32->timeout) || put_user(n, &p->timeout) ||
get_user(addr, &p32->data) || put_user(compat_ptr(addr), &p->data))
return -EFAULT;
return proc_bulk(ps, p);
}
static int proc_disconnectsignal_compat(struct usb_dev_state *ps, void __user *arg)
{
struct usbdevfs_disconnectsignal32 ds;
if (copy_from_user(&ds, arg, sizeof(ds)))
return -EFAULT;
ps->discsignr = ds.signr;
ps->disccontext = compat_ptr(ds.context);
return 0;
}
static int get_urb32(struct usbdevfs_urb *kurb,
struct usbdevfs_urb32 __user *uurb)
{
__u32 uptr;
if (!access_ok(VERIFY_READ, uurb, sizeof(*uurb)) ||
__get_user(kurb->type, &uurb->type) ||
__get_user(kurb->endpoint, &uurb->endpoint) ||
__get_user(kurb->status, &uurb->status) ||
__get_user(kurb->flags, &uurb->flags) ||
__get_user(kurb->buffer_length, &uurb->buffer_length) ||
__get_user(kurb->actual_length, &uurb->actual_length) ||
__get_user(kurb->start_frame, &uurb->start_frame) ||
__get_user(kurb->number_of_packets, &uurb->number_of_packets) ||
__get_user(kurb->error_count, &uurb->error_count) ||
__get_user(kurb->signr, &uurb->signr))
return -EFAULT;
if (__get_user(uptr, &uurb->buffer))
return -EFAULT;
kurb->buffer = compat_ptr(uptr);
if (__get_user(uptr, &uurb->usercontext))
return -EFAULT;
kurb->usercontext = compat_ptr(uptr);
return 0;
}
static int proc_submiturb_compat(struct usb_dev_state *ps, void __user *arg)
{
struct usbdevfs_urb uurb;
if (get_urb32(&uurb, (struct usbdevfs_urb32 __user *)arg))
return -EFAULT;
return proc_do_submiturb(ps, &uurb,
((struct usbdevfs_urb32 __user *)arg)->iso_frame_desc,
arg);
}
static int processcompl_compat(struct async *as, void __user * __user *arg)
{
struct urb *urb = as->urb;
struct usbdevfs_urb32 __user *userurb = as->userurb;
void __user *addr = as->userurb;
unsigned int i;
if (as->userbuffer && urb->actual_length) {
if (copy_urb_data_to_user(as->userbuffer, urb))
return -EFAULT;
}
if (put_user(as->status, &userurb->status))
return -EFAULT;
if (put_user(urb->actual_length, &userurb->actual_length))
return -EFAULT;
if (put_user(urb->error_count, &userurb->error_count))
return -EFAULT;
if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
for (i = 0; i < urb->number_of_packets; i++) {
if (put_user(urb->iso_frame_desc[i].actual_length,
&userurb->iso_frame_desc[i].actual_length))
return -EFAULT;
if (put_user(urb->iso_frame_desc[i].status,
&userurb->iso_frame_desc[i].status))
return -EFAULT;
}
}
if (put_user(ptr_to_compat(addr), (u32 __user *)arg))
return -EFAULT;
return 0;
}
static int proc_reapurb_compat(struct usb_dev_state *ps, void __user *arg)
{
struct async *as = reap_as(ps);
if (as) {
int retval = processcompl_compat(as, (void __user * __user *)arg);
free_async(as);
return retval;
}
if (signal_pending(current))
return -EINTR;
return -EIO;
}
static int proc_reapurbnonblock_compat(struct usb_dev_state *ps, void __user *arg)
{
int retval;
struct async *as;
retval = -EAGAIN;
as = async_getcompleted(ps);
if (as) {
retval = processcompl_compat(as, (void __user * __user *)arg);
free_async(as);
}
return retval;
}
#endif
static int proc_disconnectsignal(struct usb_dev_state *ps, void __user *arg)
{
struct usbdevfs_disconnectsignal ds;
if (copy_from_user(&ds, arg, sizeof(ds)))
return -EFAULT;
ps->discsignr = ds.signr;
ps->disccontext = ds.context;
return 0;
}
static int proc_claiminterface(struct usb_dev_state *ps, void __user *arg)
{
unsigned int ifnum;
if (get_user(ifnum, (unsigned int __user *)arg))
return -EFAULT;
return claimintf(ps, ifnum);
}
static int proc_releaseinterface(struct usb_dev_state *ps, void __user *arg)
{
unsigned int ifnum;
int ret;
if (get_user(ifnum, (unsigned int __user *)arg))
return -EFAULT;
if ((ret = releaseintf(ps, ifnum)) < 0)
return ret;
destroy_async_on_interface (ps, ifnum);
return 0;
}
static int proc_ioctl(struct usb_dev_state *ps, struct usbdevfs_ioctl *ctl)
{
int size;
void *buf = NULL;
int retval = 0;
struct usb_interface *intf = NULL;
struct usb_driver *driver = NULL;
/* alloc buffer */
if ((size = _IOC_SIZE(ctl->ioctl_code)) > 0) {
buf = kmalloc(size, GFP_KERNEL);
if (buf == NULL)
return -ENOMEM;
if ((_IOC_DIR(ctl->ioctl_code) & _IOC_WRITE)) {
if (copy_from_user(buf, ctl->data, size)) {
kfree(buf);
return -EFAULT;
}
} else {
memset(buf, 0, size);
}
}
if (!connected(ps)) {
kfree(buf);
return -ENODEV;
}
if (ps->dev->state != USB_STATE_CONFIGURED)
retval = -EHOSTUNREACH;
else if (!(intf = usb_ifnum_to_if(ps->dev, ctl->ifno)))
retval = -EINVAL;
else switch (ctl->ioctl_code) {
/* disconnect kernel driver from interface */
case USBDEVFS_DISCONNECT:
if (intf->dev.driver) {
driver = to_usb_driver(intf->dev.driver);
dev_dbg(&intf->dev, "disconnect by usbfs\n");
usb_driver_release_interface(driver, intf);
} else
retval = -ENODATA;
break;
/* let kernel drivers try to (re)bind to the interface */
case USBDEVFS_CONNECT:
if (!intf->dev.driver)
retval = device_attach(&intf->dev);
else
retval = -EBUSY;
break;
/* talk directly to the interface's driver */
default:
if (intf->dev.driver)
driver = to_usb_driver(intf->dev.driver);
if (driver == NULL || driver->unlocked_ioctl == NULL) {
retval = -ENOTTY;
} else {
retval = driver->unlocked_ioctl(intf, ctl->ioctl_code, buf);
if (retval == -ENOIOCTLCMD)
retval = -ENOTTY;
}
}
/* cleanup and return */
if (retval >= 0
&& (_IOC_DIR(ctl->ioctl_code) & _IOC_READ) != 0
&& size > 0
&& copy_to_user(ctl->data, buf, size) != 0)
retval = -EFAULT;
kfree(buf);
return retval;
}
static int proc_ioctl_default(struct usb_dev_state *ps, void __user *arg)
{
struct usbdevfs_ioctl ctrl;
if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
return -EFAULT;
return proc_ioctl(ps, &ctrl);
}
#ifdef CONFIG_COMPAT
static int proc_ioctl_compat(struct usb_dev_state *ps, compat_uptr_t arg)
{
struct usbdevfs_ioctl32 __user *uioc;
struct usbdevfs_ioctl ctrl;
u32 udata;
uioc = compat_ptr((long)arg);
if (!access_ok(VERIFY_READ, uioc, sizeof(*uioc)) ||
__get_user(ctrl.ifno, &uioc->ifno) ||
__get_user(ctrl.ioctl_code, &uioc->ioctl_code) ||
__get_user(udata, &uioc->data))
return -EFAULT;
ctrl.data = compat_ptr(udata);
return proc_ioctl(ps, &ctrl);
}
#endif
static int proc_claim_port(struct usb_dev_state *ps, void __user *arg)
{
unsigned portnum;
int rc;
if (get_user(portnum, (unsigned __user *) arg))
return -EFAULT;
rc = usb_hub_claim_port(ps->dev, portnum, ps);
if (rc == 0)
snoop(&ps->dev->dev, "port %d claimed by process %d: %s\n",
portnum, task_pid_nr(current), current->comm);
return rc;
}
static int proc_release_port(struct usb_dev_state *ps, void __user *arg)
{
unsigned portnum;
if (get_user(portnum, (unsigned __user *) arg))
return -EFAULT;
return usb_hub_release_port(ps->dev, portnum, ps);
}
static int proc_get_capabilities(struct usb_dev_state *ps, void __user *arg)
{
__u32 caps;
caps = USBDEVFS_CAP_ZERO_PACKET | USBDEVFS_CAP_NO_PACKET_SIZE_LIM;
if (!ps->dev->bus->no_stop_on_short)
caps |= USBDEVFS_CAP_BULK_CONTINUATION;
if (ps->dev->bus->sg_tablesize)
caps |= USBDEVFS_CAP_BULK_SCATTER_GATHER;
if (put_user(caps, (__u32 __user *)arg))
return -EFAULT;
return 0;
}
static int proc_disconnect_claim(struct usb_dev_state *ps, void __user *arg)
{
struct usbdevfs_disconnect_claim dc;
struct usb_interface *intf;
if (copy_from_user(&dc, arg, sizeof(dc)))
return -EFAULT;
intf = usb_ifnum_to_if(ps->dev, dc.interface);
if (!intf)
return -EINVAL;
if (intf->dev.driver) {
struct usb_driver *driver = to_usb_driver(intf->dev.driver);
if ((dc.flags & USBDEVFS_DISCONNECT_CLAIM_IF_DRIVER) &&
strncmp(dc.driver, intf->dev.driver->name,
sizeof(dc.driver)) != 0)
return -EBUSY;
if ((dc.flags & USBDEVFS_DISCONNECT_CLAIM_EXCEPT_DRIVER) &&
strncmp(dc.driver, intf->dev.driver->name,
sizeof(dc.driver)) == 0)
return -EBUSY;
dev_dbg(&intf->dev, "disconnect by usbfs\n");
usb_driver_release_interface(driver, intf);
}
return claimintf(ps, dc.interface);
}
static int proc_alloc_streams(struct usb_dev_state *ps, void __user *arg)
{
unsigned num_streams, num_eps;
struct usb_host_endpoint **eps;
struct usb_interface *intf;
int r;
r = parse_usbdevfs_streams(ps, arg, &num_streams, &num_eps,
&eps, &intf);
if (r)
return r;
destroy_async_on_interface(ps,
intf->altsetting[0].desc.bInterfaceNumber);
r = usb_alloc_streams(intf, eps, num_eps, num_streams, GFP_KERNEL);
kfree(eps);
return r;
}
static int proc_free_streams(struct usb_dev_state *ps, void __user *arg)
{
unsigned num_eps;
struct usb_host_endpoint **eps;
struct usb_interface *intf;
int r;
r = parse_usbdevfs_streams(ps, arg, NULL, &num_eps, &eps, &intf);
if (r)
return r;
destroy_async_on_interface(ps,
intf->altsetting[0].desc.bInterfaceNumber);
r = usb_free_streams(intf, eps, num_eps, GFP_KERNEL);
kfree(eps);
return r;
}
/*
* NOTE: All requests here that have interface numbers as parameters
* are assuming that somehow the configuration has been prevented from
* changing. But there's no mechanism to ensure that...
*/
static long usbdev_do_ioctl(struct file *file, unsigned int cmd,
void __user *p)
{
struct usb_dev_state *ps = file->private_data;
struct inode *inode = file_inode(file);
struct usb_device *dev = ps->dev;
int ret = -ENOTTY;
if (!(file->f_mode & FMODE_WRITE))
return -EPERM;
usb_lock_device(dev);
if (!connected(ps)) {
usb_unlock_device(dev);
return -ENODEV;
}
switch (cmd) {
case USBDEVFS_CONTROL:
snoop(&dev->dev, "%s: CONTROL\n", __func__);
ret = proc_control(ps, p);
if (ret >= 0)
inode->i_mtime = CURRENT_TIME;
break;
case USBDEVFS_BULK:
snoop(&dev->dev, "%s: BULK\n", __func__);
ret = proc_bulk(ps, p);
if (ret >= 0)
inode->i_mtime = CURRENT_TIME;
break;
case USBDEVFS_RESETEP:
snoop(&dev->dev, "%s: RESETEP\n", __func__);
ret = proc_resetep(ps, p);
if (ret >= 0)
inode->i_mtime = CURRENT_TIME;
break;
case USBDEVFS_RESET:
snoop(&dev->dev, "%s: RESET\n", __func__);
ret = proc_resetdevice(ps);
break;
case USBDEVFS_CLEAR_HALT:
snoop(&dev->dev, "%s: CLEAR_HALT\n", __func__);
ret = proc_clearhalt(ps, p);
if (ret >= 0)
inode->i_mtime = CURRENT_TIME;
break;
case USBDEVFS_GETDRIVER:
snoop(&dev->dev, "%s: GETDRIVER\n", __func__);
ret = proc_getdriver(ps, p);
break;
case USBDEVFS_CONNECTINFO:
snoop(&dev->dev, "%s: CONNECTINFO\n", __func__);
ret = proc_connectinfo(ps, p);
break;
case USBDEVFS_SETINTERFACE:
snoop(&dev->dev, "%s: SETINTERFACE\n", __func__);
ret = proc_setintf(ps, p);
break;
case USBDEVFS_SETCONFIGURATION:
snoop(&dev->dev, "%s: SETCONFIGURATION\n", __func__);
ret = proc_setconfig(ps, p);
break;
case USBDEVFS_SUBMITURB:
snoop(&dev->dev, "%s: SUBMITURB\n", __func__);
ret = proc_submiturb(ps, p);
if (ret >= 0)
inode->i_mtime = CURRENT_TIME;
break;
#ifdef CONFIG_COMPAT
case USBDEVFS_CONTROL32:
snoop(&dev->dev, "%s: CONTROL32\n", __func__);
ret = proc_control_compat(ps, p);
if (ret >= 0)
inode->i_mtime = CURRENT_TIME;
break;
case USBDEVFS_BULK32:
snoop(&dev->dev, "%s: BULK32\n", __func__);
ret = proc_bulk_compat(ps, p);
if (ret >= 0)
inode->i_mtime = CURRENT_TIME;
break;
case USBDEVFS_DISCSIGNAL32:
snoop(&dev->dev, "%s: DISCSIGNAL32\n", __func__);
ret = proc_disconnectsignal_compat(ps, p);
break;
case USBDEVFS_SUBMITURB32:
snoop(&dev->dev, "%s: SUBMITURB32\n", __func__);
ret = proc_submiturb_compat(ps, p);
if (ret >= 0)
inode->i_mtime = CURRENT_TIME;
break;
case USBDEVFS_REAPURB32:
snoop(&dev->dev, "%s: REAPURB32\n", __func__);
ret = proc_reapurb_compat(ps, p);
break;
case USBDEVFS_REAPURBNDELAY32:
snoop(&dev->dev, "%s: REAPURBNDELAY32\n", __func__);
ret = proc_reapurbnonblock_compat(ps, p);
break;
case USBDEVFS_IOCTL32:
snoop(&dev->dev, "%s: IOCTL32\n", __func__);
ret = proc_ioctl_compat(ps, ptr_to_compat(p));
break;
#endif
case USBDEVFS_DISCARDURB:
snoop(&dev->dev, "%s: DISCARDURB\n", __func__);
ret = proc_unlinkurb(ps, p);
break;
case USBDEVFS_REAPURB:
snoop(&dev->dev, "%s: REAPURB\n", __func__);
ret = proc_reapurb(ps, p);
break;
case USBDEVFS_REAPURBNDELAY:
snoop(&dev->dev, "%s: REAPURBNDELAY\n", __func__);
ret = proc_reapurbnonblock(ps, p);
break;
case USBDEVFS_DISCSIGNAL:
snoop(&dev->dev, "%s: DISCSIGNAL\n", __func__);
ret = proc_disconnectsignal(ps, p);
break;
case USBDEVFS_CLAIMINTERFACE:
snoop(&dev->dev, "%s: CLAIMINTERFACE\n", __func__);
ret = proc_claiminterface(ps, p);
break;
case USBDEVFS_RELEASEINTERFACE:
snoop(&dev->dev, "%s: RELEASEINTERFACE\n", __func__);
ret = proc_releaseinterface(ps, p);
break;
case USBDEVFS_IOCTL:
snoop(&dev->dev, "%s: IOCTL\n", __func__);
ret = proc_ioctl_default(ps, p);
break;
case USBDEVFS_CLAIM_PORT:
snoop(&dev->dev, "%s: CLAIM_PORT\n", __func__);
ret = proc_claim_port(ps, p);
break;
case USBDEVFS_RELEASE_PORT:
snoop(&dev->dev, "%s: RELEASE_PORT\n", __func__);
ret = proc_release_port(ps, p);
break;
case USBDEVFS_GET_CAPABILITIES:
ret = proc_get_capabilities(ps, p);
break;
case USBDEVFS_DISCONNECT_CLAIM:
ret = proc_disconnect_claim(ps, p);
break;
case USBDEVFS_ALLOC_STREAMS:
ret = proc_alloc_streams(ps, p);
break;
case USBDEVFS_FREE_STREAMS:
ret = proc_free_streams(ps, p);
break;
}
usb_unlock_device(dev);
if (ret >= 0)
inode->i_atime = CURRENT_TIME;
return ret;
}
static long usbdev_ioctl(struct file *file, unsigned int cmd,
unsigned long arg)
{
int ret;
ret = usbdev_do_ioctl(file, cmd, (void __user *)arg);
return ret;
}
#ifdef CONFIG_COMPAT
static long usbdev_compat_ioctl(struct file *file, unsigned int cmd,
unsigned long arg)
{
int ret;
ret = usbdev_do_ioctl(file, cmd, compat_ptr(arg));
return ret;
}
#endif
/* No kernel lock - fine */
static unsigned int usbdev_poll(struct file *file,
struct poll_table_struct *wait)
{
struct usb_dev_state *ps = file->private_data;
unsigned int mask = 0;
poll_wait(file, &ps->wait, wait);
if (file->f_mode & FMODE_WRITE && !list_empty(&ps->async_completed))
mask |= POLLOUT | POLLWRNORM;
if (!connected(ps))
mask |= POLLERR | POLLHUP;
return mask;
}
const struct file_operations usbdev_file_operations = {
.owner = THIS_MODULE,
.llseek = usbdev_lseek,
.read = usbdev_read,
.poll = usbdev_poll,
.unlocked_ioctl = usbdev_ioctl,
#ifdef CONFIG_COMPAT
.compat_ioctl = usbdev_compat_ioctl,
#endif
.open = usbdev_open,
.release = usbdev_release,
};
static void usbdev_remove(struct usb_device *udev)
{
struct usb_dev_state *ps;
struct siginfo sinfo;
while (!list_empty(&udev->filelist)) {
ps = list_entry(udev->filelist.next, struct usb_dev_state, list);
destroy_all_async(ps);
wake_up_all(&ps->wait);
list_del_init(&ps->list);
if (ps->discsignr) {
sinfo.si_signo = ps->discsignr;
sinfo.si_errno = EPIPE;
sinfo.si_code = SI_ASYNCIO;
sinfo.si_addr = ps->disccontext;
kill_pid_info_as_cred(ps->discsignr, &sinfo,
ps->disc_pid, ps->cred, ps->secid);
}
}
}
static int usbdev_notify(struct notifier_block *self,
unsigned long action, void *dev)
{
switch (action) {
case USB_DEVICE_ADD:
break;
case USB_DEVICE_REMOVE:
usbdev_remove(dev);
break;
}
return NOTIFY_OK;
}
static struct notifier_block usbdev_nb = {
.notifier_call = usbdev_notify,
};
static struct cdev usb_device_cdev;
int __init usb_devio_init(void)
{
int retval;
retval = register_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX,
"usb_device");
if (retval) {
printk(KERN_ERR "Unable to register minors for usb_device\n");
goto out;
}
cdev_init(&usb_device_cdev, &usbdev_file_operations);
retval = cdev_add(&usb_device_cdev, USB_DEVICE_DEV, USB_DEVICE_MAX);
if (retval) {
printk(KERN_ERR "Unable to get usb_device major %d\n",
USB_DEVICE_MAJOR);
goto error_cdev;
}
usb_register_notify(&usbdev_nb);
out:
return retval;
error_cdev:
unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
goto out;
}
void usb_devio_cleanup(void)
{
usb_unregister_notify(&usbdev_nb);
cdev_del(&usb_device_cdev);
unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
}
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