1 /*****************************************************************************/
4 * devio.c -- User space communication with USB devices.
6 * Copyright (C) 1999-2000 Thomas Sailer (sailer@ife.ee.ethz.ch)
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
22 * $Id: devio.c,v 1.7 2000/02/01 17:28:48 fliegl Exp $
24 * This file implements the usbfs/x/y files, where
25 * x is the bus number and y the device number.
27 * It allows user space programs/"drivers" to communicate directly
28 * with USB devices without intervening kernel driver.
31 * 22.12.1999 0.1 Initial release (split from proc_usb.c)
32 * 04.01.2000 0.2 Turned into its own filesystem
35 /*****************************************************************************/
39 #include <linux/slab.h>
40 #include <linux/smp_lock.h>
41 #include <linux/signal.h>
42 #include <linux/poll.h>
43 #include <linux/module.h>
44 #include <linux/usb.h>
45 #include <linux/usbdevice_fs.h>
46 #include <linux/cdev.h>
47 #include <asm/uaccess.h>
48 #include <asm/byteorder.h>
49 #include <linux/moduleparam.h>
51 #include "hcd.h" /* for usbcore internals */
55 #define USB_DEVICE_MAX USB_MAXBUS * 128
56 static struct class *usb_device_class
;
59 struct list_head asynclist
;
61 struct task_struct
*task
;
64 void __user
*userbuffer
;
69 static int usbfs_snoop
= 0;
70 module_param (usbfs_snoop
, bool, S_IRUGO
| S_IWUSR
);
71 MODULE_PARM_DESC (usbfs_snoop
, "true to log all usbfs traffic");
73 #define snoop(dev, format, arg...) \
76 dev_info( dev , format , ## arg); \
79 #define USB_DEVICE_DEV MKDEV(USB_DEVICE_MAJOR, 0)
82 #define MAX_USBFS_BUFFER_SIZE 16384
84 static inline int connected (struct usb_device
*dev
)
86 return dev
->state
!= USB_STATE_NOTATTACHED
;
89 static loff_t
usbdev_lseek(struct file
*file
, loff_t offset
, int orig
)
101 file
->f_pos
+= offset
;
113 static ssize_t
usbdev_read(struct file
*file
, char __user
*buf
, size_t nbytes
, loff_t
*ppos
)
115 struct dev_state
*ps
= (struct dev_state
*)file
->private_data
;
116 struct usb_device
*dev
= ps
->dev
;
123 usb_lock_device(dev
);
124 if (!connected(dev
)) {
127 } else if (pos
< 0) {
132 if (pos
< sizeof(struct usb_device_descriptor
)) {
133 struct usb_device_descriptor
*desc
= kmalloc(sizeof(*desc
), GFP_KERNEL
);
138 memcpy(desc
, &dev
->descriptor
, sizeof(dev
->descriptor
));
139 le16_to_cpus(&desc
->bcdUSB
);
140 le16_to_cpus(&desc
->idVendor
);
141 le16_to_cpus(&desc
->idProduct
);
142 le16_to_cpus(&desc
->bcdDevice
);
144 len
= sizeof(struct usb_device_descriptor
) - pos
;
147 if (copy_to_user(buf
, ((char *)desc
) + pos
, len
)) {
160 pos
= sizeof(struct usb_device_descriptor
);
161 for (i
= 0; nbytes
&& i
< dev
->descriptor
.bNumConfigurations
; i
++) {
162 struct usb_config_descriptor
*config
=
163 (struct usb_config_descriptor
*)dev
->rawdescriptors
[i
];
164 unsigned int length
= le16_to_cpu(config
->wTotalLength
);
166 if (*ppos
< pos
+ length
) {
168 /* The descriptor may claim to be longer than it
169 * really is. Here is the actual allocated length. */
171 le16_to_cpu(dev
->config
[i
].desc
.wTotalLength
);
173 len
= length
- (*ppos
- pos
);
177 /* Simply don't write (skip over) unallocated parts */
178 if (alloclen
> (*ppos
- pos
)) {
179 alloclen
-= (*ppos
- pos
);
180 if (copy_to_user(buf
,
181 dev
->rawdescriptors
[i
] + (*ppos
- pos
),
182 min(len
, alloclen
))) {
198 usb_unlock_device(dev
);
203 * async list handling
206 static struct async
*alloc_async(unsigned int numisoframes
)
208 unsigned int assize
= sizeof(struct async
) + numisoframes
* sizeof(struct usb_iso_packet_descriptor
);
209 struct async
*as
= kmalloc(assize
, GFP_KERNEL
);
212 memset(as
, 0, assize
);
213 as
->urb
= usb_alloc_urb(numisoframes
, GFP_KERNEL
);
221 static void free_async(struct async
*as
)
223 kfree(as
->urb
->transfer_buffer
);
224 kfree(as
->urb
->setup_packet
);
225 usb_free_urb(as
->urb
);
229 static inline void async_newpending(struct async
*as
)
231 struct dev_state
*ps
= as
->ps
;
234 spin_lock_irqsave(&ps
->lock
, flags
);
235 list_add_tail(&as
->asynclist
, &ps
->async_pending
);
236 spin_unlock_irqrestore(&ps
->lock
, flags
);
239 static inline void async_removepending(struct async
*as
)
241 struct dev_state
*ps
= as
->ps
;
244 spin_lock_irqsave(&ps
->lock
, flags
);
245 list_del_init(&as
->asynclist
);
246 spin_unlock_irqrestore(&ps
->lock
, flags
);
249 static inline struct async
*async_getcompleted(struct dev_state
*ps
)
252 struct async
*as
= NULL
;
254 spin_lock_irqsave(&ps
->lock
, flags
);
255 if (!list_empty(&ps
->async_completed
)) {
256 as
= list_entry(ps
->async_completed
.next
, struct async
, asynclist
);
257 list_del_init(&as
->asynclist
);
259 spin_unlock_irqrestore(&ps
->lock
, flags
);
263 static inline struct async
*async_getpending(struct dev_state
*ps
, void __user
*userurb
)
268 spin_lock_irqsave(&ps
->lock
, flags
);
269 list_for_each_entry(as
, &ps
->async_pending
, asynclist
)
270 if (as
->userurb
== userurb
) {
271 list_del_init(&as
->asynclist
);
272 spin_unlock_irqrestore(&ps
->lock
, flags
);
275 spin_unlock_irqrestore(&ps
->lock
, flags
);
279 static void async_completed(struct urb
*urb
, struct pt_regs
*regs
)
281 struct async
*as
= (struct async
*)urb
->context
;
282 struct dev_state
*ps
= as
->ps
;
283 struct siginfo sinfo
;
285 spin_lock(&ps
->lock
);
286 list_move_tail(&as
->asynclist
, &ps
->async_completed
);
287 spin_unlock(&ps
->lock
);
289 sinfo
.si_signo
= as
->signr
;
290 sinfo
.si_errno
= as
->urb
->status
;
291 sinfo
.si_code
= SI_ASYNCIO
;
292 sinfo
.si_addr
= as
->userurb
;
293 send_sig_info(as
->signr
, &sinfo
, as
->task
);
298 static void destroy_async (struct dev_state
*ps
, struct list_head
*list
)
303 spin_lock_irqsave(&ps
->lock
, flags
);
304 while (!list_empty(list
)) {
305 as
= list_entry(list
->next
, struct async
, asynclist
);
306 list_del_init(&as
->asynclist
);
308 /* drop the spinlock so the completion handler can run */
309 spin_unlock_irqrestore(&ps
->lock
, flags
);
310 usb_kill_urb(as
->urb
);
311 spin_lock_irqsave(&ps
->lock
, flags
);
313 spin_unlock_irqrestore(&ps
->lock
, flags
);
314 as
= async_getcompleted(ps
);
317 as
= async_getcompleted(ps
);
321 static void destroy_async_on_interface (struct dev_state
*ps
, unsigned int ifnum
)
323 struct list_head
*p
, *q
, hitlist
;
326 INIT_LIST_HEAD(&hitlist
);
327 spin_lock_irqsave(&ps
->lock
, flags
);
328 list_for_each_safe(p
, q
, &ps
->async_pending
)
329 if (ifnum
== list_entry(p
, struct async
, asynclist
)->ifnum
)
330 list_move_tail(p
, &hitlist
);
331 spin_unlock_irqrestore(&ps
->lock
, flags
);
332 destroy_async(ps
, &hitlist
);
335 static inline void destroy_all_async(struct dev_state
*ps
)
337 destroy_async(ps
, &ps
->async_pending
);
341 * interface claims are made only at the request of user level code,
342 * which can also release them (explicitly or by closing files).
343 * they're also undone when devices disconnect.
346 static int driver_probe (struct usb_interface
*intf
,
347 const struct usb_device_id
*id
)
352 static void driver_disconnect(struct usb_interface
*intf
)
354 struct dev_state
*ps
= usb_get_intfdata (intf
);
355 unsigned int ifnum
= intf
->altsetting
->desc
.bInterfaceNumber
;
360 /* NOTE: this relies on usbcore having canceled and completed
361 * all pending I/O requests; 2.6 does that.
364 if (likely(ifnum
< 8*sizeof(ps
->ifclaimed
)))
365 clear_bit(ifnum
, &ps
->ifclaimed
);
367 warn("interface number %u out of range", ifnum
);
369 usb_set_intfdata (intf
, NULL
);
371 /* force async requests to complete */
372 destroy_async_on_interface(ps
, ifnum
);
375 struct usb_driver usbfs_driver
= {
376 .owner
= THIS_MODULE
,
378 .probe
= driver_probe
,
379 .disconnect
= driver_disconnect
,
382 static int claimintf(struct dev_state
*ps
, unsigned int ifnum
)
384 struct usb_device
*dev
= ps
->dev
;
385 struct usb_interface
*intf
;
388 if (ifnum
>= 8*sizeof(ps
->ifclaimed
))
390 /* already claimed */
391 if (test_bit(ifnum
, &ps
->ifclaimed
))
394 /* lock against other changes to driver bindings */
395 down_write(&usb_bus_type
.subsys
.rwsem
);
396 intf
= usb_ifnum_to_if(dev
, ifnum
);
400 err
= usb_driver_claim_interface(&usbfs_driver
, intf
, ps
);
401 up_write(&usb_bus_type
.subsys
.rwsem
);
403 set_bit(ifnum
, &ps
->ifclaimed
);
407 static int releaseintf(struct dev_state
*ps
, unsigned int ifnum
)
409 struct usb_device
*dev
;
410 struct usb_interface
*intf
;
414 if (ifnum
>= 8*sizeof(ps
->ifclaimed
))
417 /* lock against other changes to driver bindings */
418 down_write(&usb_bus_type
.subsys
.rwsem
);
419 intf
= usb_ifnum_to_if(dev
, ifnum
);
422 else if (test_and_clear_bit(ifnum
, &ps
->ifclaimed
)) {
423 usb_driver_release_interface(&usbfs_driver
, intf
);
426 up_write(&usb_bus_type
.subsys
.rwsem
);
430 static int checkintf(struct dev_state
*ps
, unsigned int ifnum
)
432 if (ps
->dev
->state
!= USB_STATE_CONFIGURED
)
433 return -EHOSTUNREACH
;
434 if (ifnum
>= 8*sizeof(ps
->ifclaimed
))
436 if (test_bit(ifnum
, &ps
->ifclaimed
))
438 /* if not yet claimed, claim it for the driver */
439 dev_warn(&ps
->dev
->dev
, "usbfs: process %d (%s) did not claim interface %u before use\n",
440 current
->pid
, current
->comm
, ifnum
);
441 return claimintf(ps
, ifnum
);
444 static int findintfep(struct usb_device
*dev
, unsigned int ep
)
446 unsigned int i
, j
, e
;
447 struct usb_interface
*intf
;
448 struct usb_host_interface
*alts
;
449 struct usb_endpoint_descriptor
*endpt
;
451 if (ep
& ~(USB_DIR_IN
|0xf))
455 for (i
= 0; i
< dev
->actconfig
->desc
.bNumInterfaces
; i
++) {
456 intf
= dev
->actconfig
->interface
[i
];
457 for (j
= 0; j
< intf
->num_altsetting
; j
++) {
458 alts
= &intf
->altsetting
[j
];
459 for (e
= 0; e
< alts
->desc
.bNumEndpoints
; e
++) {
460 endpt
= &alts
->endpoint
[e
].desc
;
461 if (endpt
->bEndpointAddress
== ep
)
462 return alts
->desc
.bInterfaceNumber
;
469 static int check_ctrlrecip(struct dev_state
*ps
, unsigned int requesttype
, unsigned int index
)
473 if (ps
->dev
->state
!= USB_STATE_CONFIGURED
)
474 return -EHOSTUNREACH
;
475 if (USB_TYPE_VENDOR
== (USB_TYPE_MASK
& requesttype
))
479 switch (requesttype
& USB_RECIP_MASK
) {
480 case USB_RECIP_ENDPOINT
:
481 if ((ret
= findintfep(ps
->dev
, index
)) >= 0)
482 ret
= checkintf(ps
, ret
);
485 case USB_RECIP_INTERFACE
:
486 ret
= checkintf(ps
, index
);
495 static int usbdev_open(struct inode
*inode
, struct file
*file
)
497 struct usb_device
*dev
= NULL
;
498 struct dev_state
*ps
;
502 * no locking necessary here, as chrdev_open has the kernel lock
503 * (still acquire the kernel lock for safety)
506 if (!(ps
= kmalloc(sizeof(struct dev_state
), GFP_KERNEL
)))
511 /* check if we are called from a real node or usbfs */
512 if (imajor(inode
) == USB_DEVICE_MAJOR
)
513 dev
= usbdev_lookup_minor(iminor(inode
));
515 dev
= inode
->u
.generic_ip
;
524 spin_lock_init(&ps
->lock
);
525 INIT_LIST_HEAD(&ps
->async_pending
);
526 INIT_LIST_HEAD(&ps
->async_completed
);
527 init_waitqueue_head(&ps
->wait
);
529 ps
->disctask
= current
;
530 ps
->disccontext
= NULL
;
533 list_add_tail(&ps
->list
, &dev
->filelist
);
534 file
->private_data
= ps
;
541 static int usbdev_release(struct inode
*inode
, struct file
*file
)
543 struct dev_state
*ps
= (struct dev_state
*)file
->private_data
;
544 struct usb_device
*dev
= ps
->dev
;
547 usb_lock_device(dev
);
548 list_del_init(&ps
->list
);
549 for (ifnum
= 0; ps
->ifclaimed
&& ifnum
< 8*sizeof(ps
->ifclaimed
);
551 if (test_bit(ifnum
, &ps
->ifclaimed
))
552 releaseintf(ps
, ifnum
);
554 destroy_all_async(ps
);
555 usb_unlock_device(dev
);
562 static int proc_control(struct dev_state
*ps
, void __user
*arg
)
564 struct usb_device
*dev
= ps
->dev
;
565 struct usbdevfs_ctrltransfer ctrl
;
570 if (copy_from_user(&ctrl
, arg
, sizeof(ctrl
)))
572 if ((ret
= check_ctrlrecip(ps
, ctrl
.bRequestType
, ctrl
.wIndex
)))
574 if (ctrl
.wLength
> PAGE_SIZE
)
576 if (!(tbuf
= (unsigned char *)__get_free_page(GFP_KERNEL
)))
579 if (ctrl
.bRequestType
& 0x80) {
580 if (ctrl
.wLength
&& !access_ok(VERIFY_WRITE
, ctrl
.data
, ctrl
.wLength
)) {
581 free_page((unsigned long)tbuf
);
584 snoop(&dev
->dev
, "control read: bRequest=%02x "
585 "bRrequestType=%02x wValue=%04x "
586 "wIndex=%04x wLength=%04x\n",
587 ctrl
.bRequest
, ctrl
.bRequestType
, ctrl
.wValue
,
588 ctrl
.wIndex
, ctrl
.wLength
);
590 usb_unlock_device(dev
);
591 i
= usb_control_msg(dev
, usb_rcvctrlpipe(dev
, 0), ctrl
.bRequest
, ctrl
.bRequestType
,
592 ctrl
.wValue
, ctrl
.wIndex
, tbuf
, ctrl
.wLength
, tmo
);
593 usb_lock_device(dev
);
594 if ((i
> 0) && ctrl
.wLength
) {
596 dev_info(&dev
->dev
, "control read: data ");
597 for (j
= 0; j
< i
; ++j
)
598 printk ("%02x ", (unsigned char)(tbuf
)[j
]);
601 if (copy_to_user(ctrl
.data
, tbuf
, i
)) {
602 free_page((unsigned long)tbuf
);
608 if (copy_from_user(tbuf
, ctrl
.data
, ctrl
.wLength
)) {
609 free_page((unsigned long)tbuf
);
613 snoop(&dev
->dev
, "control write: bRequest=%02x "
614 "bRrequestType=%02x wValue=%04x "
615 "wIndex=%04x wLength=%04x\n",
616 ctrl
.bRequest
, ctrl
.bRequestType
, ctrl
.wValue
,
617 ctrl
.wIndex
, ctrl
.wLength
);
619 dev_info(&dev
->dev
, "control write: data: ");
620 for (j
= 0; j
< ctrl
.wLength
; ++j
)
621 printk ("%02x ", (unsigned char)(tbuf
)[j
]);
624 usb_unlock_device(dev
);
625 i
= usb_control_msg(dev
, usb_sndctrlpipe(dev
, 0), ctrl
.bRequest
, ctrl
.bRequestType
,
626 ctrl
.wValue
, ctrl
.wIndex
, tbuf
, ctrl
.wLength
, tmo
);
627 usb_lock_device(dev
);
629 free_page((unsigned long)tbuf
);
630 if (i
<0 && i
!= -EPIPE
) {
631 dev_printk(KERN_DEBUG
, &dev
->dev
, "usbfs: USBDEVFS_CONTROL "
632 "failed cmd %s rqt %u rq %u len %u ret %d\n",
633 current
->comm
, ctrl
.bRequestType
, ctrl
.bRequest
,
639 static int proc_bulk(struct dev_state
*ps
, void __user
*arg
)
641 struct usb_device
*dev
= ps
->dev
;
642 struct usbdevfs_bulktransfer bulk
;
643 unsigned int tmo
, len1
, pipe
;
648 if (copy_from_user(&bulk
, arg
, sizeof(bulk
)))
650 if ((ret
= findintfep(ps
->dev
, bulk
.ep
)) < 0)
652 if ((ret
= checkintf(ps
, ret
)))
654 if (bulk
.ep
& USB_DIR_IN
)
655 pipe
= usb_rcvbulkpipe(dev
, bulk
.ep
& 0x7f);
657 pipe
= usb_sndbulkpipe(dev
, bulk
.ep
& 0x7f);
658 if (!usb_maxpacket(dev
, pipe
, !(bulk
.ep
& USB_DIR_IN
)))
661 if (len1
> MAX_USBFS_BUFFER_SIZE
)
663 if (!(tbuf
= kmalloc(len1
, GFP_KERNEL
)))
666 if (bulk
.ep
& 0x80) {
667 if (len1
&& !access_ok(VERIFY_WRITE
, bulk
.data
, len1
)) {
671 usb_unlock_device(dev
);
672 i
= usb_bulk_msg(dev
, pipe
, tbuf
, len1
, &len2
, tmo
);
673 usb_lock_device(dev
);
675 if (copy_to_user(bulk
.data
, tbuf
, len2
)) {
682 if (copy_from_user(tbuf
, bulk
.data
, len1
)) {
687 usb_unlock_device(dev
);
688 i
= usb_bulk_msg(dev
, pipe
, tbuf
, len1
, &len2
, tmo
);
689 usb_lock_device(dev
);
697 static int proc_resetep(struct dev_state
*ps
, void __user
*arg
)
702 if (get_user(ep
, (unsigned int __user
*)arg
))
704 if ((ret
= findintfep(ps
->dev
, ep
)) < 0)
706 if ((ret
= checkintf(ps
, ret
)))
708 usb_settoggle(ps
->dev
, ep
& 0xf, !(ep
& USB_DIR_IN
), 0);
712 static int proc_clearhalt(struct dev_state
*ps
, void __user
*arg
)
718 if (get_user(ep
, (unsigned int __user
*)arg
))
720 if ((ret
= findintfep(ps
->dev
, ep
)) < 0)
722 if ((ret
= checkintf(ps
, ret
)))
725 pipe
= usb_rcvbulkpipe(ps
->dev
, ep
& 0x7f);
727 pipe
= usb_sndbulkpipe(ps
->dev
, ep
& 0x7f);
729 return usb_clear_halt(ps
->dev
, pipe
);
733 static int proc_getdriver(struct dev_state
*ps
, void __user
*arg
)
735 struct usbdevfs_getdriver gd
;
736 struct usb_interface
*intf
;
739 if (copy_from_user(&gd
, arg
, sizeof(gd
)))
741 down_read(&usb_bus_type
.subsys
.rwsem
);
742 intf
= usb_ifnum_to_if(ps
->dev
, gd
.interface
);
743 if (!intf
|| !intf
->dev
.driver
)
746 strncpy(gd
.driver
, intf
->dev
.driver
->name
,
748 ret
= (copy_to_user(arg
, &gd
, sizeof(gd
)) ? -EFAULT
: 0);
750 up_read(&usb_bus_type
.subsys
.rwsem
);
754 static int proc_connectinfo(struct dev_state
*ps
, void __user
*arg
)
756 struct usbdevfs_connectinfo ci
;
758 ci
.devnum
= ps
->dev
->devnum
;
759 ci
.slow
= ps
->dev
->speed
== USB_SPEED_LOW
;
760 if (copy_to_user(arg
, &ci
, sizeof(ci
)))
765 static int proc_resetdevice(struct dev_state
*ps
)
767 return usb_reset_device(ps
->dev
);
771 static int proc_setintf(struct dev_state
*ps
, void __user
*arg
)
773 struct usbdevfs_setinterface setintf
;
776 if (copy_from_user(&setintf
, arg
, sizeof(setintf
)))
778 if ((ret
= checkintf(ps
, setintf
.interface
)))
780 return usb_set_interface(ps
->dev
, setintf
.interface
,
784 static int proc_setconfig(struct dev_state
*ps
, void __user
*arg
)
788 struct usb_host_config
*actconfig
;
790 if (get_user(u
, (unsigned int __user
*)arg
))
793 actconfig
= ps
->dev
->actconfig
;
795 /* Don't touch the device if any interfaces are claimed.
796 * It could interfere with other drivers' operations, and if
797 * an interface is claimed by usbfs it could easily deadlock.
802 for (i
= 0; i
< actconfig
->desc
.bNumInterfaces
; ++i
) {
803 if (usb_interface_claimed(actconfig
->interface
[i
])) {
804 dev_warn (&ps
->dev
->dev
,
805 "usbfs: interface %d claimed by %s "
806 "while '%s' sets config #%d\n",
807 actconfig
->interface
[i
]
809 ->desc
.bInterfaceNumber
,
810 actconfig
->interface
[i
]
819 /* SET_CONFIGURATION is often abused as a "cheap" driver reset,
820 * so avoid usb_set_configuration()'s kick to sysfs
823 if (actconfig
&& actconfig
->desc
.bConfigurationValue
== u
)
824 status
= usb_reset_configuration(ps
->dev
);
826 status
= usb_set_configuration(ps
->dev
, u
);
833 static int proc_do_submiturb(struct dev_state
*ps
, struct usbdevfs_urb
*uurb
,
834 struct usbdevfs_iso_packet_desc __user
*iso_frame_desc
,
837 struct usbdevfs_iso_packet_desc
*isopkt
= NULL
;
838 struct usb_host_endpoint
*ep
;
840 struct usb_ctrlrequest
*dr
= NULL
;
841 unsigned int u
, totlen
, isofrmlen
;
842 int ret
, interval
= 0, ifnum
= -1;
844 if (uurb
->flags
& ~(USBDEVFS_URB_ISO_ASAP
|USBDEVFS_URB_SHORT_NOT_OK
|
845 URB_NO_FSBR
|URB_ZERO_PACKET
))
849 if (uurb
->signr
!= 0 && (uurb
->signr
< SIGRTMIN
|| uurb
->signr
> SIGRTMAX
))
851 if (!(uurb
->type
== USBDEVFS_URB_TYPE_CONTROL
&& (uurb
->endpoint
& ~USB_ENDPOINT_DIR_MASK
) == 0)) {
852 if ((ifnum
= findintfep(ps
->dev
, uurb
->endpoint
)) < 0)
854 if ((ret
= checkintf(ps
, ifnum
)))
857 if ((uurb
->endpoint
& USB_ENDPOINT_DIR_MASK
) != 0)
858 ep
= ps
->dev
->ep_in
[uurb
->endpoint
& USB_ENDPOINT_NUMBER_MASK
];
860 ep
= ps
->dev
->ep_out
[uurb
->endpoint
& USB_ENDPOINT_NUMBER_MASK
];
864 case USBDEVFS_URB_TYPE_CONTROL
:
865 if ((ep
->desc
.bmAttributes
& USB_ENDPOINT_XFERTYPE_MASK
)
866 != USB_ENDPOINT_XFER_CONTROL
)
868 /* min 8 byte setup packet, max arbitrary */
869 if (uurb
->buffer_length
< 8 || uurb
->buffer_length
> PAGE_SIZE
)
871 if (!(dr
= kmalloc(sizeof(struct usb_ctrlrequest
), GFP_KERNEL
)))
873 if (copy_from_user(dr
, uurb
->buffer
, 8)) {
877 if (uurb
->buffer_length
< (le16_to_cpup(&dr
->wLength
) + 8)) {
881 if ((ret
= check_ctrlrecip(ps
, dr
->bRequestType
, le16_to_cpup(&dr
->wIndex
)))) {
885 uurb
->endpoint
= (uurb
->endpoint
& ~USB_ENDPOINT_DIR_MASK
) | (dr
->bRequestType
& USB_ENDPOINT_DIR_MASK
);
886 uurb
->number_of_packets
= 0;
887 uurb
->buffer_length
= le16_to_cpup(&dr
->wLength
);
889 if (!access_ok((uurb
->endpoint
& USB_DIR_IN
) ? VERIFY_WRITE
: VERIFY_READ
, uurb
->buffer
, uurb
->buffer_length
)) {
895 case USBDEVFS_URB_TYPE_BULK
:
896 switch (ep
->desc
.bmAttributes
& USB_ENDPOINT_XFERTYPE_MASK
) {
897 case USB_ENDPOINT_XFER_CONTROL
:
898 case USB_ENDPOINT_XFER_ISOC
:
900 /* allow single-shot interrupt transfers, at bogus rates */
902 uurb
->number_of_packets
= 0;
903 if (uurb
->buffer_length
> MAX_USBFS_BUFFER_SIZE
)
905 if (!access_ok((uurb
->endpoint
& USB_DIR_IN
) ? VERIFY_WRITE
: VERIFY_READ
, uurb
->buffer
, uurb
->buffer_length
))
909 case USBDEVFS_URB_TYPE_ISO
:
910 /* arbitrary limit */
911 if (uurb
->number_of_packets
< 1 || uurb
->number_of_packets
> 128)
913 if ((ep
->desc
.bmAttributes
& USB_ENDPOINT_XFERTYPE_MASK
)
914 != USB_ENDPOINT_XFER_ISOC
)
916 interval
= 1 << min (15, ep
->desc
.bInterval
- 1);
917 isofrmlen
= sizeof(struct usbdevfs_iso_packet_desc
) * uurb
->number_of_packets
;
918 if (!(isopkt
= kmalloc(isofrmlen
, GFP_KERNEL
)))
920 if (copy_from_user(isopkt
, iso_frame_desc
, isofrmlen
)) {
924 for (totlen
= u
= 0; u
< uurb
->number_of_packets
; u
++) {
925 if (isopkt
[u
].length
> 1023) {
929 totlen
+= isopkt
[u
].length
;
931 if (totlen
> 32768) {
935 uurb
->buffer_length
= totlen
;
938 case USBDEVFS_URB_TYPE_INTERRUPT
:
939 uurb
->number_of_packets
= 0;
940 if ((ep
->desc
.bmAttributes
& USB_ENDPOINT_XFERTYPE_MASK
)
941 != USB_ENDPOINT_XFER_INT
)
943 if (ps
->dev
->speed
== USB_SPEED_HIGH
)
944 interval
= 1 << min (15, ep
->desc
.bInterval
- 1);
946 interval
= ep
->desc
.bInterval
;
947 if (uurb
->buffer_length
> MAX_USBFS_BUFFER_SIZE
)
949 if (!access_ok((uurb
->endpoint
& USB_DIR_IN
) ? VERIFY_WRITE
: VERIFY_READ
, uurb
->buffer
, uurb
->buffer_length
))
956 if (!(as
= alloc_async(uurb
->number_of_packets
))) {
961 if (!(as
->urb
->transfer_buffer
= kmalloc(uurb
->buffer_length
, GFP_KERNEL
))) {
967 as
->urb
->dev
= ps
->dev
;
968 as
->urb
->pipe
= (uurb
->type
<< 30) | __create_pipe(ps
->dev
, uurb
->endpoint
& 0xf) | (uurb
->endpoint
& USB_DIR_IN
);
969 as
->urb
->transfer_flags
= uurb
->flags
;
970 as
->urb
->transfer_buffer_length
= uurb
->buffer_length
;
971 as
->urb
->setup_packet
= (unsigned char*)dr
;
972 as
->urb
->start_frame
= uurb
->start_frame
;
973 as
->urb
->number_of_packets
= uurb
->number_of_packets
;
974 as
->urb
->interval
= interval
;
975 as
->urb
->context
= as
;
976 as
->urb
->complete
= async_completed
;
977 for (totlen
= u
= 0; u
< uurb
->number_of_packets
; u
++) {
978 as
->urb
->iso_frame_desc
[u
].offset
= totlen
;
979 as
->urb
->iso_frame_desc
[u
].length
= isopkt
[u
].length
;
980 totlen
+= isopkt
[u
].length
;
985 if (uurb
->endpoint
& USB_DIR_IN
)
986 as
->userbuffer
= uurb
->buffer
;
988 as
->userbuffer
= NULL
;
989 as
->signr
= uurb
->signr
;
992 if (!(uurb
->endpoint
& USB_DIR_IN
)) {
993 if (copy_from_user(as
->urb
->transfer_buffer
, uurb
->buffer
, as
->urb
->transfer_buffer_length
)) {
998 async_newpending(as
);
999 if ((ret
= usb_submit_urb(as
->urb
, GFP_KERNEL
))) {
1000 dev_printk(KERN_DEBUG
, &ps
->dev
->dev
, "usbfs: usb_submit_urb returned %d\n", ret
);
1001 async_removepending(as
);
1008 static int proc_submiturb(struct dev_state
*ps
, void __user
*arg
)
1010 struct usbdevfs_urb uurb
;
1012 if (copy_from_user(&uurb
, arg
, sizeof(uurb
)))
1015 return proc_do_submiturb(ps
, &uurb
, (((struct usbdevfs_urb __user
*)arg
)->iso_frame_desc
), arg
);
1018 static int proc_unlinkurb(struct dev_state
*ps
, void __user
*arg
)
1022 as
= async_getpending(ps
, arg
);
1025 usb_kill_urb(as
->urb
);
1029 static int processcompl(struct async
*as
, void __user
* __user
*arg
)
1031 struct urb
*urb
= as
->urb
;
1032 struct usbdevfs_urb __user
*userurb
= as
->userurb
;
1033 void __user
*addr
= as
->userurb
;
1037 if (copy_to_user(as
->userbuffer
, urb
->transfer_buffer
, urb
->transfer_buffer_length
))
1039 if (put_user(urb
->status
, &userurb
->status
))
1041 if (put_user(urb
->actual_length
, &userurb
->actual_length
))
1043 if (put_user(urb
->error_count
, &userurb
->error_count
))
1046 if (usb_pipeisoc(urb
->pipe
)) {
1047 for (i
= 0; i
< urb
->number_of_packets
; i
++) {
1048 if (put_user(urb
->iso_frame_desc
[i
].actual_length
,
1049 &userurb
->iso_frame_desc
[i
].actual_length
))
1051 if (put_user(urb
->iso_frame_desc
[i
].status
,
1052 &userurb
->iso_frame_desc
[i
].status
))
1059 if (put_user(addr
, (void __user
* __user
*)arg
))
1064 static struct async
* reap_as(struct dev_state
*ps
)
1066 DECLARE_WAITQUEUE(wait
, current
);
1067 struct async
*as
= NULL
;
1068 struct usb_device
*dev
= ps
->dev
;
1070 add_wait_queue(&ps
->wait
, &wait
);
1072 __set_current_state(TASK_INTERRUPTIBLE
);
1073 if ((as
= async_getcompleted(ps
)))
1075 if (signal_pending(current
))
1077 usb_unlock_device(dev
);
1079 usb_lock_device(dev
);
1081 remove_wait_queue(&ps
->wait
, &wait
);
1082 set_current_state(TASK_RUNNING
);
1086 static int proc_reapurb(struct dev_state
*ps
, void __user
*arg
)
1088 struct async
*as
= reap_as(ps
);
1090 return processcompl(as
, (void __user
* __user
*)arg
);
1091 if (signal_pending(current
))
1096 static int proc_reapurbnonblock(struct dev_state
*ps
, void __user
*arg
)
1100 if (!(as
= async_getcompleted(ps
)))
1102 return processcompl(as
, (void __user
* __user
*)arg
);
1105 #ifdef CONFIG_COMPAT
1107 static int get_urb32(struct usbdevfs_urb
*kurb
,
1108 struct usbdevfs_urb32 __user
*uurb
)
1111 if (get_user(kurb
->type
, &uurb
->type
) ||
1112 __get_user(kurb
->endpoint
, &uurb
->endpoint
) ||
1113 __get_user(kurb
->status
, &uurb
->status
) ||
1114 __get_user(kurb
->flags
, &uurb
->flags
) ||
1115 __get_user(kurb
->buffer_length
, &uurb
->buffer_length
) ||
1116 __get_user(kurb
->actual_length
, &uurb
->actual_length
) ||
1117 __get_user(kurb
->start_frame
, &uurb
->start_frame
) ||
1118 __get_user(kurb
->number_of_packets
, &uurb
->number_of_packets
) ||
1119 __get_user(kurb
->error_count
, &uurb
->error_count
) ||
1120 __get_user(kurb
->signr
, &uurb
->signr
))
1123 if (__get_user(uptr
, &uurb
->buffer
))
1125 kurb
->buffer
= compat_ptr(uptr
);
1126 if (__get_user(uptr
, &uurb
->buffer
))
1128 kurb
->usercontext
= compat_ptr(uptr
);
1133 static int proc_submiturb_compat(struct dev_state
*ps
, void __user
*arg
)
1135 struct usbdevfs_urb uurb
;
1137 if (get_urb32(&uurb
,(struct usbdevfs_urb32
*)arg
))
1140 return proc_do_submiturb(ps
, &uurb
, ((struct usbdevfs_urb32 __user
*)arg
)->iso_frame_desc
, arg
);
1143 static int processcompl_compat(struct async
*as
, void __user
* __user
*arg
)
1145 struct urb
*urb
= as
->urb
;
1146 struct usbdevfs_urb32 __user
*userurb
= as
->userurb
;
1147 void __user
*addr
= as
->userurb
;
1151 if (copy_to_user(as
->userbuffer
, urb
->transfer_buffer
, urb
->transfer_buffer_length
))
1153 if (put_user(urb
->status
, &userurb
->status
))
1155 if (put_user(urb
->actual_length
, &userurb
->actual_length
))
1157 if (put_user(urb
->error_count
, &userurb
->error_count
))
1160 if (usb_pipeisoc(urb
->pipe
)) {
1161 for (i
= 0; i
< urb
->number_of_packets
; i
++) {
1162 if (put_user(urb
->iso_frame_desc
[i
].actual_length
,
1163 &userurb
->iso_frame_desc
[i
].actual_length
))
1165 if (put_user(urb
->iso_frame_desc
[i
].status
,
1166 &userurb
->iso_frame_desc
[i
].status
))
1172 if (put_user((u32
)(u64
)addr
, (u32 __user
*)arg
))
1177 static int proc_reapurb_compat(struct dev_state
*ps
, void __user
*arg
)
1179 struct async
*as
= reap_as(ps
);
1181 return processcompl_compat(as
, (void __user
* __user
*)arg
);
1182 if (signal_pending(current
))
1187 static int proc_reapurbnonblock_compat(struct dev_state
*ps
, void __user
*arg
)
1191 if (!(as
= async_getcompleted(ps
)))
1193 return processcompl_compat(as
, (void __user
* __user
*)arg
);
1198 static int proc_disconnectsignal(struct dev_state
*ps
, void __user
*arg
)
1200 struct usbdevfs_disconnectsignal ds
;
1202 if (copy_from_user(&ds
, arg
, sizeof(ds
)))
1204 if (ds
.signr
!= 0 && (ds
.signr
< SIGRTMIN
|| ds
.signr
> SIGRTMAX
))
1206 ps
->discsignr
= ds
.signr
;
1207 ps
->disccontext
= ds
.context
;
1211 static int proc_claiminterface(struct dev_state
*ps
, void __user
*arg
)
1215 if (get_user(ifnum
, (unsigned int __user
*)arg
))
1217 return claimintf(ps
, ifnum
);
1220 static int proc_releaseinterface(struct dev_state
*ps
, void __user
*arg
)
1225 if (get_user(ifnum
, (unsigned int __user
*)arg
))
1227 if ((ret
= releaseintf(ps
, ifnum
)) < 0)
1229 destroy_async_on_interface (ps
, ifnum
);
1233 static int proc_ioctl (struct dev_state
*ps
, void __user
*arg
)
1235 struct usbdevfs_ioctl ctrl
;
1239 struct usb_interface
*intf
= NULL
;
1240 struct usb_driver
*driver
= NULL
;
1243 /* get input parameters and alloc buffer */
1244 if (copy_from_user(&ctrl
, arg
, sizeof (ctrl
)))
1246 if ((size
= _IOC_SIZE (ctrl
.ioctl_code
)) > 0) {
1247 if ((buf
= kmalloc (size
, GFP_KERNEL
)) == NULL
)
1249 if ((_IOC_DIR(ctrl
.ioctl_code
) & _IOC_WRITE
)) {
1250 if (copy_from_user (buf
, ctrl
.data
, size
)) {
1255 memset (buf
, 0, size
);
1259 if (!connected(ps
->dev
)) {
1264 if (ps
->dev
->state
!= USB_STATE_CONFIGURED
)
1265 retval
= -EHOSTUNREACH
;
1266 else if (!(intf
= usb_ifnum_to_if (ps
->dev
, ctrl
.ifno
)))
1268 else switch (ctrl
.ioctl_code
) {
1270 /* disconnect kernel driver from interface */
1271 case USBDEVFS_DISCONNECT
:
1273 /* don't allow the user to unbind the hub driver from
1274 * a hub with children to manage */
1275 for (i
= 0; i
< ps
->dev
->maxchild
; ++i
) {
1276 if (ps
->dev
->children
[i
])
1282 down_write(&usb_bus_type
.subsys
.rwsem
);
1283 if (intf
->dev
.driver
) {
1284 driver
= to_usb_driver(intf
->dev
.driver
);
1285 dev_dbg (&intf
->dev
, "disconnect by usbfs\n");
1286 usb_driver_release_interface(driver
, intf
);
1289 up_write(&usb_bus_type
.subsys
.rwsem
);
1292 /* let kernel drivers try to (re)bind to the interface */
1293 case USBDEVFS_CONNECT
:
1294 usb_unlock_device(ps
->dev
);
1295 usb_lock_all_devices();
1296 bus_rescan_devices(intf
->dev
.bus
);
1297 usb_unlock_all_devices();
1298 usb_lock_device(ps
->dev
);
1301 /* talk directly to the interface's driver */
1303 down_read(&usb_bus_type
.subsys
.rwsem
);
1304 if (intf
->dev
.driver
)
1305 driver
= to_usb_driver(intf
->dev
.driver
);
1306 if (driver
== NULL
|| driver
->ioctl
== NULL
) {
1309 retval
= driver
->ioctl (intf
, ctrl
.ioctl_code
, buf
);
1310 if (retval
== -ENOIOCTLCMD
)
1313 up_read(&usb_bus_type
.subsys
.rwsem
);
1316 /* cleanup and return */
1318 && (_IOC_DIR (ctrl
.ioctl_code
) & _IOC_READ
) != 0
1320 && copy_to_user (ctrl
.data
, buf
, size
) != 0)
1328 * NOTE: All requests here that have interface numbers as parameters
1329 * are assuming that somehow the configuration has been prevented from
1330 * changing. But there's no mechanism to ensure that...
1332 static int usbdev_ioctl(struct inode
*inode
, struct file
*file
, unsigned int cmd
, unsigned long arg
)
1334 struct dev_state
*ps
= (struct dev_state
*)file
->private_data
;
1335 struct usb_device
*dev
= ps
->dev
;
1336 void __user
*p
= (void __user
*)arg
;
1339 if (!(file
->f_mode
& FMODE_WRITE
))
1341 usb_lock_device(dev
);
1342 if (!connected(dev
)) {
1343 usb_unlock_device(dev
);
1348 case USBDEVFS_CONTROL
:
1349 snoop(&dev
->dev
, "%s: CONTROL\n", __FUNCTION__
);
1350 ret
= proc_control(ps
, p
);
1352 inode
->i_mtime
= CURRENT_TIME
;
1356 snoop(&dev
->dev
, "%s: BULK\n", __FUNCTION__
);
1357 ret
= proc_bulk(ps
, p
);
1359 inode
->i_mtime
= CURRENT_TIME
;
1362 case USBDEVFS_RESETEP
:
1363 snoop(&dev
->dev
, "%s: RESETEP\n", __FUNCTION__
);
1364 ret
= proc_resetep(ps
, p
);
1366 inode
->i_mtime
= CURRENT_TIME
;
1369 case USBDEVFS_RESET
:
1370 snoop(&dev
->dev
, "%s: RESET\n", __FUNCTION__
);
1371 ret
= proc_resetdevice(ps
);
1374 case USBDEVFS_CLEAR_HALT
:
1375 snoop(&dev
->dev
, "%s: CLEAR_HALT\n", __FUNCTION__
);
1376 ret
= proc_clearhalt(ps
, p
);
1378 inode
->i_mtime
= CURRENT_TIME
;
1381 case USBDEVFS_GETDRIVER
:
1382 snoop(&dev
->dev
, "%s: GETDRIVER\n", __FUNCTION__
);
1383 ret
= proc_getdriver(ps
, p
);
1386 case USBDEVFS_CONNECTINFO
:
1387 snoop(&dev
->dev
, "%s: CONNECTINFO\n", __FUNCTION__
);
1388 ret
= proc_connectinfo(ps
, p
);
1391 case USBDEVFS_SETINTERFACE
:
1392 snoop(&dev
->dev
, "%s: SETINTERFACE\n", __FUNCTION__
);
1393 ret
= proc_setintf(ps
, p
);
1396 case USBDEVFS_SETCONFIGURATION
:
1397 snoop(&dev
->dev
, "%s: SETCONFIGURATION\n", __FUNCTION__
);
1398 ret
= proc_setconfig(ps
, p
);
1401 case USBDEVFS_SUBMITURB
:
1402 snoop(&dev
->dev
, "%s: SUBMITURB\n", __FUNCTION__
);
1403 ret
= proc_submiturb(ps
, p
);
1405 inode
->i_mtime
= CURRENT_TIME
;
1408 #ifdef CONFIG_COMPAT
1410 case USBDEVFS_SUBMITURB32
:
1411 snoop(&dev
->dev
, "%s: SUBMITURB32\n", __FUNCTION__
);
1412 ret
= proc_submiturb_compat(ps
, p
);
1414 inode
->i_mtime
= CURRENT_TIME
;
1417 case USBDEVFS_REAPURB32
:
1418 snoop(&dev
->dev
, "%s: REAPURB32\n", __FUNCTION__
);
1419 ret
= proc_reapurb_compat(ps
, p
);
1422 case USBDEVFS_REAPURBNDELAY32
:
1423 snoop(&dev
->dev
, "%s: REAPURBDELAY32\n", __FUNCTION__
);
1424 ret
= proc_reapurbnonblock_compat(ps
, p
);
1429 case USBDEVFS_DISCARDURB
:
1430 snoop(&dev
->dev
, "%s: DISCARDURB\n", __FUNCTION__
);
1431 ret
= proc_unlinkurb(ps
, p
);
1434 case USBDEVFS_REAPURB
:
1435 snoop(&dev
->dev
, "%s: REAPURB\n", __FUNCTION__
);
1436 ret
= proc_reapurb(ps
, p
);
1439 case USBDEVFS_REAPURBNDELAY
:
1440 snoop(&dev
->dev
, "%s: REAPURBDELAY\n", __FUNCTION__
);
1441 ret
= proc_reapurbnonblock(ps
, p
);
1444 case USBDEVFS_DISCSIGNAL
:
1445 snoop(&dev
->dev
, "%s: DISCSIGNAL\n", __FUNCTION__
);
1446 ret
= proc_disconnectsignal(ps
, p
);
1449 case USBDEVFS_CLAIMINTERFACE
:
1450 snoop(&dev
->dev
, "%s: CLAIMINTERFACE\n", __FUNCTION__
);
1451 ret
= proc_claiminterface(ps
, p
);
1454 case USBDEVFS_RELEASEINTERFACE
:
1455 snoop(&dev
->dev
, "%s: RELEASEINTERFACE\n", __FUNCTION__
);
1456 ret
= proc_releaseinterface(ps
, p
);
1459 case USBDEVFS_IOCTL
:
1460 snoop(&dev
->dev
, "%s: IOCTL\n", __FUNCTION__
);
1461 ret
= proc_ioctl(ps
, p
);
1464 usb_unlock_device(dev
);
1466 inode
->i_atime
= CURRENT_TIME
;
1470 /* No kernel lock - fine */
1471 static unsigned int usbdev_poll(struct file
*file
, struct poll_table_struct
*wait
)
1473 struct dev_state
*ps
= (struct dev_state
*)file
->private_data
;
1474 unsigned int mask
= 0;
1476 poll_wait(file
, &ps
->wait
, wait
);
1477 if (file
->f_mode
& FMODE_WRITE
&& !list_empty(&ps
->async_completed
))
1478 mask
|= POLLOUT
| POLLWRNORM
;
1479 if (!connected(ps
->dev
))
1480 mask
|= POLLERR
| POLLHUP
;
1484 struct file_operations usbfs_device_file_operations
= {
1485 .llseek
= usbdev_lseek
,
1486 .read
= usbdev_read
,
1487 .poll
= usbdev_poll
,
1488 .ioctl
= usbdev_ioctl
,
1489 .open
= usbdev_open
,
1490 .release
= usbdev_release
,
1493 struct usb_device
*usbdev_lookup_minor(int minor
)
1495 struct class_device
*class_dev
;
1496 struct usb_device
*dev
= NULL
;
1498 down(&usb_device_class
->sem
);
1499 list_for_each_entry(class_dev
, &usb_device_class
->children
, node
) {
1500 if (class_dev
->devt
== MKDEV(USB_DEVICE_MAJOR
, minor
)) {
1501 dev
= class_dev
->class_data
;
1505 up(&usb_device_class
->sem
);
1510 void usbdev_add(struct usb_device
*dev
)
1512 int minor
= ((dev
->bus
->busnum
-1) * 128) + (dev
->devnum
-1);
1514 dev
->class_dev
= class_device_create(usb_device_class
,
1515 MKDEV(USB_DEVICE_MAJOR
, minor
), &dev
->dev
,
1516 "usbdev%d.%d", dev
->bus
->busnum
, dev
->devnum
);
1518 dev
->class_dev
->class_data
= dev
;
1521 void usbdev_remove(struct usb_device
*dev
)
1523 class_device_unregister(dev
->class_dev
);
1526 static struct cdev usb_device_cdev
= {
1527 .kobj
= {.name
= "usb_device", },
1528 .owner
= THIS_MODULE
,
1531 int __init
usbdev_init(void)
1535 retval
= register_chrdev_region(USB_DEVICE_DEV
, USB_DEVICE_MAX
,
1538 err("unable to register minors for usb_device");
1541 cdev_init(&usb_device_cdev
, &usbfs_device_file_operations
);
1542 retval
= cdev_add(&usb_device_cdev
, USB_DEVICE_DEV
, USB_DEVICE_MAX
);
1544 err("unable to get usb_device major %d", USB_DEVICE_MAJOR
);
1545 unregister_chrdev_region(USB_DEVICE_DEV
, USB_DEVICE_MAX
);
1548 usb_device_class
= class_create(THIS_MODULE
, "usb_device");
1549 if (IS_ERR(usb_device_class
)) {
1550 err("unable to register usb_device class");
1551 retval
= PTR_ERR(usb_device_class
);
1552 usb_device_class
= NULL
;
1553 cdev_del(&usb_device_cdev
);
1554 unregister_chrdev_region(USB_DEVICE_DEV
, USB_DEVICE_MAX
);
1561 void usbdev_cleanup(void)
1563 class_destroy(usb_device_class
);
1564 cdev_del(&usb_device_cdev
);
1565 unregister_chrdev_region(USB_DEVICE_DEV
, USB_DEVICE_MAX
);