[PATCH] USB: optimise devio.c::usbdev_read
[linux-2.6.git] / drivers / usb / core / devio.c
1 /*****************************************************************************/
2
3 /*
4  *      devio.c  --  User space communication with USB devices.
5  *
6  *      Copyright (C) 1999-2000  Thomas Sailer (sailer@ife.ee.ethz.ch)
7  *
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.
12  *
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.
17  *
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.
21  *
22  *  $Id: devio.c,v 1.7 2000/02/01 17:28:48 fliegl Exp $
23  *
24  *  This file implements the usbfs/x/y files, where
25  *  x is the bus number and y the device number.
26  *
27  *  It allows user space programs/"drivers" to communicate directly
28  *  with USB devices without intervening kernel driver.
29  *
30  *  Revision history
31  *    22.12.1999   0.1   Initial release (split from proc_usb.c)
32  *    04.01.2000   0.2   Turned into its own filesystem
33  *    30.09.2005   0.3   Fix user-triggerable oops in async URB delivery
34  *                       (CAN-2005-3055)
35  */
36
37 /*****************************************************************************/
38
39 #include <linux/fs.h>
40 #include <linux/mm.h>
41 #include <linux/slab.h>
42 #include <linux/smp_lock.h>
43 #include <linux/signal.h>
44 #include <linux/poll.h>
45 #include <linux/module.h>
46 #include <linux/usb.h>
47 #include <linux/usbdevice_fs.h>
48 #include <linux/cdev.h>
49 #include <linux/notifier.h>
50 #include <asm/uaccess.h>
51 #include <asm/byteorder.h>
52 #include <linux/moduleparam.h>
53
54 #include "hcd.h"        /* for usbcore internals */
55 #include "usb.h"
56
57 #define USB_MAXBUS                      64
58 #define USB_DEVICE_MAX                  USB_MAXBUS * 128
59 static struct class *usb_device_class;
60
61 struct async {
62         struct list_head asynclist;
63         struct dev_state *ps;
64         pid_t pid;
65         uid_t uid, euid;
66         unsigned int signr;
67         unsigned int ifnum;
68         void __user *userbuffer;
69         void __user *userurb;
70         struct urb *urb;
71 };
72
73 static int usbfs_snoop = 0;
74 module_param (usbfs_snoop, bool, S_IRUGO | S_IWUSR);
75 MODULE_PARM_DESC (usbfs_snoop, "true to log all usbfs traffic");
76
77 #define snoop(dev, format, arg...)                              \
78         do {                                                    \
79                 if (usbfs_snoop)                                \
80                         dev_info( dev , format , ## arg);       \
81         } while (0)
82
83 #define USB_DEVICE_DEV          MKDEV(USB_DEVICE_MAJOR, 0)
84
85
86 #define MAX_USBFS_BUFFER_SIZE   16384
87
88 static inline int connected (struct usb_device *dev)
89 {
90         return dev->state != USB_STATE_NOTATTACHED;
91 }
92
93 static loff_t usbdev_lseek(struct file *file, loff_t offset, int orig)
94 {
95         loff_t ret;
96
97         lock_kernel();
98
99         switch (orig) {
100         case 0:
101                 file->f_pos = offset;
102                 ret = file->f_pos;
103                 break;
104         case 1:
105                 file->f_pos += offset;
106                 ret = file->f_pos;
107                 break;
108         case 2:
109         default:
110                 ret = -EINVAL;
111         }
112
113         unlock_kernel();
114         return ret;
115 }
116
117 static ssize_t usbdev_read(struct file *file, char __user *buf, size_t nbytes, loff_t *ppos)
118 {
119         struct dev_state *ps = (struct dev_state *)file->private_data;
120         struct usb_device *dev = ps->dev;
121         ssize_t ret = 0;
122         unsigned len;
123         loff_t pos;
124         int i;
125
126         pos = *ppos;
127         usb_lock_device(dev);
128         if (!connected(dev)) {
129                 ret = -ENODEV;
130                 goto err;
131         } else if (pos < 0) {
132                 ret = -EINVAL;
133                 goto err;
134         }
135
136         if (pos < sizeof(struct usb_device_descriptor)) {
137                 struct usb_device_descriptor temp_desc ; /* 18 bytes - fits on the stack */
138
139                 memcpy(&temp_desc, &dev->descriptor, sizeof(dev->descriptor));
140                 le16_to_cpus(&temp_desc->bcdUSB);
141                 le16_to_cpus(&temp_desc->idVendor);
142                 le16_to_cpus(&temp_desc->idProduct);
143                 le16_to_cpus(&temp_desc->bcdDevice);
144
145                 len = sizeof(struct usb_device_descriptor) - pos;
146                 if (len > nbytes)
147                         len = nbytes;
148                 if (copy_to_user(buf, ((char *)&temp_desc) + pos, len)) {
149                         ret = -EFAULT;
150                         goto err;
151                 }
152
153                 *ppos += len;
154                 buf += len;
155                 nbytes -= len;
156                 ret += len;
157         }
158
159         pos = sizeof(struct usb_device_descriptor);
160         for (i = 0; nbytes && i < dev->descriptor.bNumConfigurations; i++) {
161                 struct usb_config_descriptor *config =
162                         (struct usb_config_descriptor *)dev->rawdescriptors[i];
163                 unsigned int length = le16_to_cpu(config->wTotalLength);
164
165                 if (*ppos < pos + length) {
166
167                         /* The descriptor may claim to be longer than it
168                          * really is.  Here is the actual allocated length. */
169                         unsigned alloclen =
170                                 le16_to_cpu(dev->config[i].desc.wTotalLength);
171
172                         len = length - (*ppos - pos);
173                         if (len > nbytes)
174                                 len = nbytes;
175
176                         /* Simply don't write (skip over) unallocated parts */
177                         if (alloclen > (*ppos - pos)) {
178                                 alloclen -= (*ppos - pos);
179                                 if (copy_to_user(buf,
180                                     dev->rawdescriptors[i] + (*ppos - pos),
181                                     min(len, alloclen))) {
182                                         ret = -EFAULT;
183                                         goto err;
184                                 }
185                         }
186
187                         *ppos += len;
188                         buf += len;
189                         nbytes -= len;
190                         ret += len;
191                 }
192
193                 pos += length;
194         }
195
196 err:
197         usb_unlock_device(dev);
198         return ret;
199 }
200
201 /*
202  * async list handling
203  */
204
205 static struct async *alloc_async(unsigned int numisoframes)
206 {
207         unsigned int assize = sizeof(struct async) + numisoframes * sizeof(struct usb_iso_packet_descriptor);
208         struct async *as = kzalloc(assize, GFP_KERNEL);
209
210         if (!as)
211                 return NULL;
212         as->urb = usb_alloc_urb(numisoframes, GFP_KERNEL);
213         if (!as->urb) {
214                 kfree(as);
215                 return NULL;
216         }
217         return as;
218 }
219
220 static void free_async(struct async *as)
221 {
222         kfree(as->urb->transfer_buffer);
223         kfree(as->urb->setup_packet);
224         usb_free_urb(as->urb);
225         kfree(as);
226 }
227
228 static inline void async_newpending(struct async *as)
229 {
230         struct dev_state *ps = as->ps;
231         unsigned long flags;
232         
233         spin_lock_irqsave(&ps->lock, flags);
234         list_add_tail(&as->asynclist, &ps->async_pending);
235         spin_unlock_irqrestore(&ps->lock, flags);
236 }
237
238 static inline void async_removepending(struct async *as)
239 {
240         struct dev_state *ps = as->ps;
241         unsigned long flags;
242         
243         spin_lock_irqsave(&ps->lock, flags);
244         list_del_init(&as->asynclist);
245         spin_unlock_irqrestore(&ps->lock, flags);
246 }
247
248 static inline struct async *async_getcompleted(struct dev_state *ps)
249 {
250         unsigned long flags;
251         struct async *as = NULL;
252
253         spin_lock_irqsave(&ps->lock, flags);
254         if (!list_empty(&ps->async_completed)) {
255                 as = list_entry(ps->async_completed.next, struct async, asynclist);
256                 list_del_init(&as->asynclist);
257         }
258         spin_unlock_irqrestore(&ps->lock, flags);
259         return as;
260 }
261
262 static inline struct async *async_getpending(struct dev_state *ps, void __user *userurb)
263 {
264         unsigned long flags;
265         struct async *as;
266
267         spin_lock_irqsave(&ps->lock, flags);
268         list_for_each_entry(as, &ps->async_pending, asynclist)
269                 if (as->userurb == userurb) {
270                         list_del_init(&as->asynclist);
271                         spin_unlock_irqrestore(&ps->lock, flags);
272                         return as;
273                 }
274         spin_unlock_irqrestore(&ps->lock, flags);
275         return NULL;
276 }
277
278 static void snoop_urb(struct urb *urb, void __user *userurb)
279 {
280         int j;
281         unsigned char *data = urb->transfer_buffer;
282
283         if (!usbfs_snoop)
284                 return;
285
286         if (urb->pipe & USB_DIR_IN)
287                 dev_info(&urb->dev->dev, "direction=IN\n");
288         else
289                 dev_info(&urb->dev->dev, "direction=OUT\n");
290         dev_info(&urb->dev->dev, "userurb=%p\n", userurb);
291         dev_info(&urb->dev->dev, "transfer_buffer_length=%d\n",
292                  urb->transfer_buffer_length);
293         dev_info(&urb->dev->dev, "actual_length=%d\n", urb->actual_length);
294         dev_info(&urb->dev->dev, "data: ");
295         for (j = 0; j < urb->transfer_buffer_length; ++j)
296                 printk ("%02x ", data[j]);
297         printk("\n");
298 }
299
300 static void async_completed(struct urb *urb, struct pt_regs *regs)
301 {
302         struct async *as = (struct async *)urb->context;
303         struct dev_state *ps = as->ps;
304         struct siginfo sinfo;
305
306         spin_lock(&ps->lock);
307         list_move_tail(&as->asynclist, &ps->async_completed);
308         spin_unlock(&ps->lock);
309         if (as->signr) {
310                 sinfo.si_signo = as->signr;
311                 sinfo.si_errno = as->urb->status;
312                 sinfo.si_code = SI_ASYNCIO;
313                 sinfo.si_addr = as->userurb;
314                 kill_proc_info_as_uid(as->signr, &sinfo, as->pid, as->uid, 
315                                       as->euid);
316         }
317         snoop(&urb->dev->dev, "urb complete\n");
318         snoop_urb(urb, as->userurb);
319         wake_up(&ps->wait);
320 }
321
322 static void destroy_async (struct dev_state *ps, struct list_head *list)
323 {
324         struct async *as;
325         unsigned long flags;
326
327         spin_lock_irqsave(&ps->lock, flags);
328         while (!list_empty(list)) {
329                 as = list_entry(list->next, struct async, asynclist);
330                 list_del_init(&as->asynclist);
331
332                 /* drop the spinlock so the completion handler can run */
333                 spin_unlock_irqrestore(&ps->lock, flags);
334                 usb_kill_urb(as->urb);
335                 spin_lock_irqsave(&ps->lock, flags);
336         }
337         spin_unlock_irqrestore(&ps->lock, flags);
338         as = async_getcompleted(ps);
339         while (as) {
340                 free_async(as);
341                 as = async_getcompleted(ps);
342         }
343 }
344
345 static void destroy_async_on_interface (struct dev_state *ps, unsigned int ifnum)
346 {
347         struct list_head *p, *q, hitlist;
348         unsigned long flags;
349
350         INIT_LIST_HEAD(&hitlist);
351         spin_lock_irqsave(&ps->lock, flags);
352         list_for_each_safe(p, q, &ps->async_pending)
353                 if (ifnum == list_entry(p, struct async, asynclist)->ifnum)
354                         list_move_tail(p, &hitlist);
355         spin_unlock_irqrestore(&ps->lock, flags);
356         destroy_async(ps, &hitlist);
357 }
358
359 static inline void destroy_all_async(struct dev_state *ps)
360 {
361                 destroy_async(ps, &ps->async_pending);
362 }
363
364 /*
365  * interface claims are made only at the request of user level code,
366  * which can also release them (explicitly or by closing files).
367  * they're also undone when devices disconnect.
368  */
369
370 static int driver_probe (struct usb_interface *intf,
371                          const struct usb_device_id *id)
372 {
373         return -ENODEV;
374 }
375
376 static void driver_disconnect(struct usb_interface *intf)
377 {
378         struct dev_state *ps = usb_get_intfdata (intf);
379         unsigned int ifnum = intf->altsetting->desc.bInterfaceNumber;
380
381         if (!ps)
382                 return;
383
384         /* NOTE:  this relies on usbcore having canceled and completed
385          * all pending I/O requests; 2.6 does that.
386          */
387
388         if (likely(ifnum < 8*sizeof(ps->ifclaimed)))
389                 clear_bit(ifnum, &ps->ifclaimed);
390         else
391                 warn("interface number %u out of range", ifnum);
392
393         usb_set_intfdata (intf, NULL);
394
395         /* force async requests to complete */
396         destroy_async_on_interface(ps, ifnum);
397 }
398
399 struct usb_driver usbfs_driver = {
400         .name =         "usbfs",
401         .probe =        driver_probe,
402         .disconnect =   driver_disconnect,
403 };
404
405 static int claimintf(struct dev_state *ps, unsigned int ifnum)
406 {
407         struct usb_device *dev = ps->dev;
408         struct usb_interface *intf;
409         int err;
410
411         if (ifnum >= 8*sizeof(ps->ifclaimed))
412                 return -EINVAL;
413         /* already claimed */
414         if (test_bit(ifnum, &ps->ifclaimed))
415                 return 0;
416
417         /* lock against other changes to driver bindings */
418         down_write(&usb_bus_type.subsys.rwsem);
419         intf = usb_ifnum_to_if(dev, ifnum);
420         if (!intf)
421                 err = -ENOENT;
422         else
423                 err = usb_driver_claim_interface(&usbfs_driver, intf, ps);
424         up_write(&usb_bus_type.subsys.rwsem);
425         if (err == 0)
426                 set_bit(ifnum, &ps->ifclaimed);
427         return err;
428 }
429
430 static int releaseintf(struct dev_state *ps, unsigned int ifnum)
431 {
432         struct usb_device *dev;
433         struct usb_interface *intf;
434         int err;
435
436         err = -EINVAL;
437         if (ifnum >= 8*sizeof(ps->ifclaimed))
438                 return err;
439         dev = ps->dev;
440         /* lock against other changes to driver bindings */
441         down_write(&usb_bus_type.subsys.rwsem);
442         intf = usb_ifnum_to_if(dev, ifnum);
443         if (!intf)
444                 err = -ENOENT;
445         else if (test_and_clear_bit(ifnum, &ps->ifclaimed)) {
446                 usb_driver_release_interface(&usbfs_driver, intf);
447                 err = 0;
448         }
449         up_write(&usb_bus_type.subsys.rwsem);
450         return err;
451 }
452
453 static int checkintf(struct dev_state *ps, unsigned int ifnum)
454 {
455         if (ps->dev->state != USB_STATE_CONFIGURED)
456                 return -EHOSTUNREACH;
457         if (ifnum >= 8*sizeof(ps->ifclaimed))
458                 return -EINVAL;
459         if (test_bit(ifnum, &ps->ifclaimed))
460                 return 0;
461         /* if not yet claimed, claim it for the driver */
462         dev_warn(&ps->dev->dev, "usbfs: process %d (%s) did not claim interface %u before use\n",
463                current->pid, current->comm, ifnum);
464         return claimintf(ps, ifnum);
465 }
466
467 static int findintfep(struct usb_device *dev, unsigned int ep)
468 {
469         unsigned int i, j, e;
470         struct usb_interface *intf;
471         struct usb_host_interface *alts;
472         struct usb_endpoint_descriptor *endpt;
473
474         if (ep & ~(USB_DIR_IN|0xf))
475                 return -EINVAL;
476         if (!dev->actconfig)
477                 return -ESRCH;
478         for (i = 0; i < dev->actconfig->desc.bNumInterfaces; i++) {
479                 intf = dev->actconfig->interface[i];
480                 for (j = 0; j < intf->num_altsetting; j++) {
481                         alts = &intf->altsetting[j];
482                         for (e = 0; e < alts->desc.bNumEndpoints; e++) {
483                                 endpt = &alts->endpoint[e].desc;
484                                 if (endpt->bEndpointAddress == ep)
485                                         return alts->desc.bInterfaceNumber;
486                         }
487                 }
488         }
489         return -ENOENT; 
490 }
491
492 static int check_ctrlrecip(struct dev_state *ps, unsigned int requesttype, unsigned int index)
493 {
494         int ret = 0;
495
496         if (ps->dev->state != USB_STATE_CONFIGURED)
497                 return -EHOSTUNREACH;
498         if (USB_TYPE_VENDOR == (USB_TYPE_MASK & requesttype))
499                 return 0;
500
501         index &= 0xff;
502         switch (requesttype & USB_RECIP_MASK) {
503         case USB_RECIP_ENDPOINT:
504                 if ((ret = findintfep(ps->dev, index)) >= 0)
505                         ret = checkintf(ps, ret);
506                 break;
507
508         case USB_RECIP_INTERFACE:
509                 ret = checkintf(ps, index);
510                 break;
511         }
512         return ret;
513 }
514
515 static struct usb_device *usbdev_lookup_minor(int minor)
516 {
517         struct class_device *class_dev;
518         struct usb_device *dev = NULL;
519
520         down(&usb_device_class->sem);
521         list_for_each_entry(class_dev, &usb_device_class->children, node) {
522                 if (class_dev->devt == MKDEV(USB_DEVICE_MAJOR, minor)) {
523                         dev = class_dev->class_data;
524                         break;
525                 }
526         }
527         up(&usb_device_class->sem);
528
529         return dev;
530 };
531
532 /*
533  * file operations
534  */
535 static int usbdev_open(struct inode *inode, struct file *file)
536 {
537         struct usb_device *dev = NULL;
538         struct dev_state *ps;
539         int ret;
540
541         /* 
542          * no locking necessary here, as chrdev_open has the kernel lock
543          * (still acquire the kernel lock for safety)
544          */
545         ret = -ENOMEM;
546         if (!(ps = kmalloc(sizeof(struct dev_state), GFP_KERNEL)))
547                 goto out_nolock;
548
549         lock_kernel();
550         ret = -ENOENT;
551         /* check if we are called from a real node or usbfs */
552         if (imajor(inode) == USB_DEVICE_MAJOR)
553                 dev = usbdev_lookup_minor(iminor(inode));
554         if (!dev)
555                 dev = inode->u.generic_ip;
556         if (!dev) {
557                 kfree(ps);
558                 goto out;
559         }
560         usb_get_dev(dev);
561         ret = 0;
562         ps->dev = dev;
563         ps->file = file;
564         spin_lock_init(&ps->lock);
565         INIT_LIST_HEAD(&ps->async_pending);
566         INIT_LIST_HEAD(&ps->async_completed);
567         init_waitqueue_head(&ps->wait);
568         ps->discsignr = 0;
569         ps->disc_pid = current->pid;
570         ps->disc_uid = current->uid;
571         ps->disc_euid = current->euid;
572         ps->disccontext = NULL;
573         ps->ifclaimed = 0;
574         wmb();
575         list_add_tail(&ps->list, &dev->filelist);
576         file->private_data = ps;
577  out:
578         unlock_kernel();
579  out_nolock:
580         return ret;
581 }
582
583 static int usbdev_release(struct inode *inode, struct file *file)
584 {
585         struct dev_state *ps = (struct dev_state *)file->private_data;
586         struct usb_device *dev = ps->dev;
587         unsigned int ifnum;
588
589         usb_lock_device(dev);
590         list_del_init(&ps->list);
591         for (ifnum = 0; ps->ifclaimed && ifnum < 8*sizeof(ps->ifclaimed);
592                         ifnum++) {
593                 if (test_bit(ifnum, &ps->ifclaimed))
594                         releaseintf(ps, ifnum);
595         }
596         destroy_all_async(ps);
597         usb_unlock_device(dev);
598         usb_put_dev(dev);
599         ps->dev = NULL;
600         kfree(ps);
601         return 0;
602 }
603
604 static int proc_control(struct dev_state *ps, void __user *arg)
605 {
606         struct usb_device *dev = ps->dev;
607         struct usbdevfs_ctrltransfer ctrl;
608         unsigned int tmo;
609         unsigned char *tbuf;
610         int i, j, ret;
611
612         if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
613                 return -EFAULT;
614         if ((ret = check_ctrlrecip(ps, ctrl.bRequestType, ctrl.wIndex)))
615                 return ret;
616         if (ctrl.wLength > PAGE_SIZE)
617                 return -EINVAL;
618         if (!(tbuf = (unsigned char *)__get_free_page(GFP_KERNEL)))
619                 return -ENOMEM;
620         tmo = ctrl.timeout;
621         if (ctrl.bRequestType & 0x80) {
622                 if (ctrl.wLength && !access_ok(VERIFY_WRITE, ctrl.data, ctrl.wLength)) {
623                         free_page((unsigned long)tbuf);
624                         return -EINVAL;
625                 }
626                 snoop(&dev->dev, "control read: bRequest=%02x "
627                                 "bRrequestType=%02x wValue=%04x "
628                                 "wIndex=%04x wLength=%04x\n",
629                         ctrl.bRequest, ctrl.bRequestType, ctrl.wValue,
630                                 ctrl.wIndex, ctrl.wLength);
631
632                 usb_unlock_device(dev);
633                 i = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), ctrl.bRequest, ctrl.bRequestType,
634                                        ctrl.wValue, ctrl.wIndex, tbuf, ctrl.wLength, tmo);
635                 usb_lock_device(dev);
636                 if ((i > 0) && ctrl.wLength) {
637                         if (usbfs_snoop) {
638                                 dev_info(&dev->dev, "control read: data ");
639                                 for (j = 0; j < i; ++j)
640                                         printk("%02x ", (unsigned char)(tbuf)[j]);
641                                 printk("\n");
642                         }
643                         if (copy_to_user(ctrl.data, tbuf, i)) {
644                                 free_page((unsigned long)tbuf);
645                                 return -EFAULT;
646                         }
647                 }
648         } else {
649                 if (ctrl.wLength) {
650                         if (copy_from_user(tbuf, ctrl.data, ctrl.wLength)) {
651                                 free_page((unsigned long)tbuf);
652                                 return -EFAULT;
653                         }
654                 }
655                 snoop(&dev->dev, "control write: bRequest=%02x "
656                                 "bRrequestType=%02x wValue=%04x "
657                                 "wIndex=%04x wLength=%04x\n",
658                         ctrl.bRequest, ctrl.bRequestType, ctrl.wValue,
659                                 ctrl.wIndex, ctrl.wLength);
660                 if (usbfs_snoop) {
661                         dev_info(&dev->dev, "control write: data: ");
662                         for (j = 0; j < ctrl.wLength; ++j)
663                                 printk("%02x ", (unsigned char)(tbuf)[j]);
664                         printk("\n");
665                 }
666                 usb_unlock_device(dev);
667                 i = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), ctrl.bRequest, ctrl.bRequestType,
668                                        ctrl.wValue, ctrl.wIndex, tbuf, ctrl.wLength, tmo);
669                 usb_lock_device(dev);
670         }
671         free_page((unsigned long)tbuf);
672         if (i<0 && i != -EPIPE) {
673                 dev_printk(KERN_DEBUG, &dev->dev, "usbfs: USBDEVFS_CONTROL "
674                            "failed cmd %s rqt %u rq %u len %u ret %d\n",
675                            current->comm, ctrl.bRequestType, ctrl.bRequest,
676                            ctrl.wLength, i);
677         }
678         return i;
679 }
680
681 static int proc_bulk(struct dev_state *ps, void __user *arg)
682 {
683         struct usb_device *dev = ps->dev;
684         struct usbdevfs_bulktransfer bulk;
685         unsigned int tmo, len1, pipe;
686         int len2;
687         unsigned char *tbuf;
688         int i, j, ret;
689
690         if (copy_from_user(&bulk, arg, sizeof(bulk)))
691                 return -EFAULT;
692         if ((ret = findintfep(ps->dev, bulk.ep)) < 0)
693                 return ret;
694         if ((ret = checkintf(ps, ret)))
695                 return ret;
696         if (bulk.ep & USB_DIR_IN)
697                 pipe = usb_rcvbulkpipe(dev, bulk.ep & 0x7f);
698         else
699                 pipe = usb_sndbulkpipe(dev, bulk.ep & 0x7f);
700         if (!usb_maxpacket(dev, pipe, !(bulk.ep & USB_DIR_IN)))
701                 return -EINVAL;
702         len1 = bulk.len;
703         if (len1 > MAX_USBFS_BUFFER_SIZE)
704                 return -EINVAL;
705         if (!(tbuf = kmalloc(len1, GFP_KERNEL)))
706                 return -ENOMEM;
707         tmo = bulk.timeout;
708         if (bulk.ep & 0x80) {
709                 if (len1 && !access_ok(VERIFY_WRITE, bulk.data, len1)) {
710                         kfree(tbuf);
711                         return -EINVAL;
712                 }
713                 snoop(&dev->dev, "bulk read: len=0x%02x timeout=%04d\n",
714                         bulk.len, bulk.timeout);
715                 usb_unlock_device(dev);
716                 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
717                 usb_lock_device(dev);
718                 if (!i && len2) {
719                         if (usbfs_snoop) {
720                                 dev_info(&dev->dev, "bulk read: data ");
721                                 for (j = 0; j < len2; ++j)
722                                         printk("%02x ", (unsigned char)(tbuf)[j]);
723                                 printk("\n");
724                         }
725                         if (copy_to_user(bulk.data, tbuf, len2)) {
726                                 kfree(tbuf);
727                                 return -EFAULT;
728                         }
729                 }
730         } else {
731                 if (len1) {
732                         if (copy_from_user(tbuf, bulk.data, len1)) {
733                                 kfree(tbuf);
734                                 return -EFAULT;
735                         }
736                 }
737                 snoop(&dev->dev, "bulk write: len=0x%02x timeout=%04d\n",
738                         bulk.len, bulk.timeout);
739                 if (usbfs_snoop) {
740                         dev_info(&dev->dev, "bulk write: data: ");
741                         for (j = 0; j < len1; ++j)
742                                 printk("%02x ", (unsigned char)(tbuf)[j]);
743                         printk("\n");
744                 }
745                 usb_unlock_device(dev);
746                 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
747                 usb_lock_device(dev);
748         }
749         kfree(tbuf);
750         if (i < 0)
751                 return i;
752         return len2;
753 }
754
755 static int proc_resetep(struct dev_state *ps, void __user *arg)
756 {
757         unsigned int ep;
758         int ret;
759
760         if (get_user(ep, (unsigned int __user *)arg))
761                 return -EFAULT;
762         if ((ret = findintfep(ps->dev, ep)) < 0)
763                 return ret;
764         if ((ret = checkintf(ps, ret)))
765                 return ret;
766         usb_settoggle(ps->dev, ep & 0xf, !(ep & USB_DIR_IN), 0);
767         return 0;
768 }
769
770 static int proc_clearhalt(struct dev_state *ps, void __user *arg)
771 {
772         unsigned int ep;
773         int pipe;
774         int ret;
775
776         if (get_user(ep, (unsigned int __user *)arg))
777                 return -EFAULT;
778         if ((ret = findintfep(ps->dev, ep)) < 0)
779                 return ret;
780         if ((ret = checkintf(ps, ret)))
781                 return ret;
782         if (ep & USB_DIR_IN)
783                 pipe = usb_rcvbulkpipe(ps->dev, ep & 0x7f);
784         else
785                 pipe = usb_sndbulkpipe(ps->dev, ep & 0x7f);
786
787         return usb_clear_halt(ps->dev, pipe);
788 }
789                 
790
791 static int proc_getdriver(struct dev_state *ps, void __user *arg)
792 {
793         struct usbdevfs_getdriver gd;
794         struct usb_interface *intf;
795         int ret;
796
797         if (copy_from_user(&gd, arg, sizeof(gd)))
798                 return -EFAULT;
799         down_read(&usb_bus_type.subsys.rwsem);
800         intf = usb_ifnum_to_if(ps->dev, gd.interface);
801         if (!intf || !intf->dev.driver)
802                 ret = -ENODATA;
803         else {
804                 strncpy(gd.driver, intf->dev.driver->name,
805                                 sizeof(gd.driver));
806                 ret = (copy_to_user(arg, &gd, sizeof(gd)) ? -EFAULT : 0);
807         }
808         up_read(&usb_bus_type.subsys.rwsem);
809         return ret;
810 }
811
812 static int proc_connectinfo(struct dev_state *ps, void __user *arg)
813 {
814         struct usbdevfs_connectinfo ci;
815
816         ci.devnum = ps->dev->devnum;
817         ci.slow = ps->dev->speed == USB_SPEED_LOW;
818         if (copy_to_user(arg, &ci, sizeof(ci)))
819                 return -EFAULT;
820         return 0;
821 }
822
823 static int proc_resetdevice(struct dev_state *ps)
824 {
825         return usb_reset_device(ps->dev);
826
827 }
828
829 static int proc_setintf(struct dev_state *ps, void __user *arg)
830 {
831         struct usbdevfs_setinterface setintf;
832         int ret;
833
834         if (copy_from_user(&setintf, arg, sizeof(setintf)))
835                 return -EFAULT;
836         if ((ret = checkintf(ps, setintf.interface)))
837                 return ret;
838         return usb_set_interface(ps->dev, setintf.interface,
839                         setintf.altsetting);
840 }
841
842 static int proc_setconfig(struct dev_state *ps, void __user *arg)
843 {
844         unsigned int u;
845         int status = 0;
846         struct usb_host_config *actconfig;
847
848         if (get_user(u, (unsigned int __user *)arg))
849                 return -EFAULT;
850
851         actconfig = ps->dev->actconfig;
852  
853         /* Don't touch the device if any interfaces are claimed.
854          * It could interfere with other drivers' operations, and if
855          * an interface is claimed by usbfs it could easily deadlock.
856          */
857         if (actconfig) {
858                 int i;
859  
860                 for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) {
861                         if (usb_interface_claimed(actconfig->interface[i])) {
862                                 dev_warn (&ps->dev->dev,
863                                         "usbfs: interface %d claimed by %s "
864                                         "while '%s' sets config #%d\n",
865                                         actconfig->interface[i]
866                                                 ->cur_altsetting
867                                                 ->desc.bInterfaceNumber,
868                                         actconfig->interface[i]
869                                                 ->dev.driver->name,
870                                         current->comm, u);
871                                 status = -EBUSY;
872                                 break;
873                         }
874                 }
875         }
876
877         /* SET_CONFIGURATION is often abused as a "cheap" driver reset,
878          * so avoid usb_set_configuration()'s kick to sysfs
879          */
880         if (status == 0) {
881                 if (actconfig && actconfig->desc.bConfigurationValue == u)
882                         status = usb_reset_configuration(ps->dev);
883                 else
884                         status = usb_set_configuration(ps->dev, u);
885         }
886
887         return status;
888 }
889
890 static int proc_do_submiturb(struct dev_state *ps, struct usbdevfs_urb *uurb,
891                              struct usbdevfs_iso_packet_desc __user *iso_frame_desc,
892                              void __user *arg)
893 {
894         struct usbdevfs_iso_packet_desc *isopkt = NULL;
895         struct usb_host_endpoint *ep;
896         struct async *as;
897         struct usb_ctrlrequest *dr = NULL;
898         unsigned int u, totlen, isofrmlen;
899         int ret, interval = 0, ifnum = -1;
900
901         if (uurb->flags & ~(USBDEVFS_URB_ISO_ASAP|USBDEVFS_URB_SHORT_NOT_OK|
902                            URB_NO_FSBR|URB_ZERO_PACKET))
903                 return -EINVAL;
904         if (!uurb->buffer)
905                 return -EINVAL;
906         if (uurb->signr != 0 && (uurb->signr < SIGRTMIN || uurb->signr > SIGRTMAX))
907                 return -EINVAL;
908         if (!(uurb->type == USBDEVFS_URB_TYPE_CONTROL && (uurb->endpoint & ~USB_ENDPOINT_DIR_MASK) == 0)) {
909                 if ((ifnum = findintfep(ps->dev, uurb->endpoint)) < 0)
910                         return ifnum;
911                 if ((ret = checkintf(ps, ifnum)))
912                         return ret;
913         }
914         if ((uurb->endpoint & USB_ENDPOINT_DIR_MASK) != 0)
915                 ep = ps->dev->ep_in [uurb->endpoint & USB_ENDPOINT_NUMBER_MASK];
916         else
917                 ep = ps->dev->ep_out [uurb->endpoint & USB_ENDPOINT_NUMBER_MASK];
918         if (!ep)
919                 return -ENOENT;
920         switch(uurb->type) {
921         case USBDEVFS_URB_TYPE_CONTROL:
922                 if ((ep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
923                                 != USB_ENDPOINT_XFER_CONTROL)
924                         return -EINVAL;
925                 /* min 8 byte setup packet, max arbitrary */
926                 if (uurb->buffer_length < 8 || uurb->buffer_length > PAGE_SIZE)
927                         return -EINVAL;
928                 if (!(dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL)))
929                         return -ENOMEM;
930                 if (copy_from_user(dr, uurb->buffer, 8)) {
931                         kfree(dr);
932                         return -EFAULT;
933                 }
934                 if (uurb->buffer_length < (le16_to_cpup(&dr->wLength) + 8)) {
935                         kfree(dr);
936                         return -EINVAL;
937                 }
938                 if ((ret = check_ctrlrecip(ps, dr->bRequestType, le16_to_cpup(&dr->wIndex)))) {
939                         kfree(dr);
940                         return ret;
941                 }
942                 uurb->endpoint = (uurb->endpoint & ~USB_ENDPOINT_DIR_MASK) | (dr->bRequestType & USB_ENDPOINT_DIR_MASK);
943                 uurb->number_of_packets = 0;
944                 uurb->buffer_length = le16_to_cpup(&dr->wLength);
945                 uurb->buffer += 8;
946                 if (!access_ok((uurb->endpoint & USB_DIR_IN) ?  VERIFY_WRITE : VERIFY_READ, uurb->buffer, uurb->buffer_length)) {
947                         kfree(dr);
948                         return -EFAULT;
949                 }
950                 snoop(&ps->dev->dev, "control urb\n");
951                 break;
952
953         case USBDEVFS_URB_TYPE_BULK:
954                 switch (ep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) {
955                 case USB_ENDPOINT_XFER_CONTROL:
956                 case USB_ENDPOINT_XFER_ISOC:
957                         return -EINVAL;
958                 /* allow single-shot interrupt transfers, at bogus rates */
959                 }
960                 uurb->number_of_packets = 0;
961                 if (uurb->buffer_length > MAX_USBFS_BUFFER_SIZE)
962                         return -EINVAL;
963                 if (!access_ok((uurb->endpoint & USB_DIR_IN) ? VERIFY_WRITE : VERIFY_READ, uurb->buffer, uurb->buffer_length))
964                         return -EFAULT;
965                 snoop(&ps->dev->dev, "bulk urb\n");
966                 break;
967
968         case USBDEVFS_URB_TYPE_ISO:
969                 /* arbitrary limit */
970                 if (uurb->number_of_packets < 1 || uurb->number_of_packets > 128)
971                         return -EINVAL;
972                 if ((ep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
973                                 != USB_ENDPOINT_XFER_ISOC)
974                         return -EINVAL;
975                 interval = 1 << min (15, ep->desc.bInterval - 1);
976                 isofrmlen = sizeof(struct usbdevfs_iso_packet_desc) * uurb->number_of_packets;
977                 if (!(isopkt = kmalloc(isofrmlen, GFP_KERNEL)))
978                         return -ENOMEM;
979                 if (copy_from_user(isopkt, iso_frame_desc, isofrmlen)) {
980                         kfree(isopkt);
981                         return -EFAULT;
982                 }
983                 for (totlen = u = 0; u < uurb->number_of_packets; u++) {
984                         if (isopkt[u].length > 1023) {
985                                 kfree(isopkt);
986                                 return -EINVAL;
987                         }
988                         totlen += isopkt[u].length;
989                 }
990                 if (totlen > 32768) {
991                         kfree(isopkt);
992                         return -EINVAL;
993                 }
994                 uurb->buffer_length = totlen;
995                 snoop(&ps->dev->dev, "iso urb\n");
996                 break;
997
998         case USBDEVFS_URB_TYPE_INTERRUPT:
999                 uurb->number_of_packets = 0;
1000                 if ((ep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
1001                                 != USB_ENDPOINT_XFER_INT)
1002                         return -EINVAL;
1003                 if (ps->dev->speed == USB_SPEED_HIGH)
1004                         interval = 1 << min (15, ep->desc.bInterval - 1);
1005                 else
1006                         interval = ep->desc.bInterval;
1007                 if (uurb->buffer_length > MAX_USBFS_BUFFER_SIZE)
1008                         return -EINVAL;
1009                 if (!access_ok((uurb->endpoint & USB_DIR_IN) ? VERIFY_WRITE : VERIFY_READ, uurb->buffer, uurb->buffer_length))
1010                         return -EFAULT;
1011                 snoop(&ps->dev->dev, "interrupt urb\n");
1012                 break;
1013
1014         default:
1015                 return -EINVAL;
1016         }
1017         if (!(as = alloc_async(uurb->number_of_packets))) {
1018                 kfree(isopkt);
1019                 kfree(dr);
1020                 return -ENOMEM;
1021         }
1022         if (!(as->urb->transfer_buffer = kmalloc(uurb->buffer_length, GFP_KERNEL))) {
1023                 kfree(isopkt);
1024                 kfree(dr);
1025                 free_async(as);
1026                 return -ENOMEM;
1027         }
1028         as->urb->dev = ps->dev;
1029         as->urb->pipe = (uurb->type << 30) | __create_pipe(ps->dev, uurb->endpoint & 0xf) | (uurb->endpoint & USB_DIR_IN);
1030         as->urb->transfer_flags = uurb->flags;
1031         as->urb->transfer_buffer_length = uurb->buffer_length;
1032         as->urb->setup_packet = (unsigned char*)dr;
1033         as->urb->start_frame = uurb->start_frame;
1034         as->urb->number_of_packets = uurb->number_of_packets;
1035         as->urb->interval = interval;
1036         as->urb->context = as;
1037         as->urb->complete = async_completed;
1038         for (totlen = u = 0; u < uurb->number_of_packets; u++) {
1039                 as->urb->iso_frame_desc[u].offset = totlen;
1040                 as->urb->iso_frame_desc[u].length = isopkt[u].length;
1041                 totlen += isopkt[u].length;
1042         }
1043         kfree(isopkt);
1044         as->ps = ps;
1045         as->userurb = arg;
1046         if (uurb->endpoint & USB_DIR_IN)
1047                 as->userbuffer = uurb->buffer;
1048         else
1049                 as->userbuffer = NULL;
1050         as->signr = uurb->signr;
1051         as->ifnum = ifnum;
1052         as->pid = current->pid;
1053         as->uid = current->uid;
1054         as->euid = current->euid;
1055         if (!(uurb->endpoint & USB_DIR_IN)) {
1056                 if (copy_from_user(as->urb->transfer_buffer, uurb->buffer, as->urb->transfer_buffer_length)) {
1057                         free_async(as);
1058                         return -EFAULT;
1059                 }
1060         }
1061         snoop(&as->urb->dev->dev, "submit urb\n");
1062         snoop_urb(as->urb, as->userurb);
1063         async_newpending(as);
1064         if ((ret = usb_submit_urb(as->urb, GFP_KERNEL))) {
1065                 dev_printk(KERN_DEBUG, &ps->dev->dev, "usbfs: usb_submit_urb returned %d\n", ret);
1066                 async_removepending(as);
1067                 free_async(as);
1068                 return ret;
1069         }
1070         return 0;
1071 }
1072
1073 static int proc_submiturb(struct dev_state *ps, void __user *arg)
1074 {
1075         struct usbdevfs_urb uurb;
1076
1077         if (copy_from_user(&uurb, arg, sizeof(uurb)))
1078                 return -EFAULT;
1079
1080         return proc_do_submiturb(ps, &uurb, (((struct usbdevfs_urb __user *)arg)->iso_frame_desc), arg);
1081 }
1082
1083 static int proc_unlinkurb(struct dev_state *ps, void __user *arg)
1084 {
1085         struct async *as;
1086
1087         as = async_getpending(ps, arg);
1088         if (!as)
1089                 return -EINVAL;
1090         usb_kill_urb(as->urb);
1091         return 0;
1092 }
1093
1094 static int processcompl(struct async *as, void __user * __user *arg)
1095 {
1096         struct urb *urb = as->urb;
1097         struct usbdevfs_urb __user *userurb = as->userurb;
1098         void __user *addr = as->userurb;
1099         unsigned int i;
1100
1101         if (as->userbuffer)
1102                 if (copy_to_user(as->userbuffer, urb->transfer_buffer, urb->transfer_buffer_length))
1103                         return -EFAULT;
1104         if (put_user(urb->status, &userurb->status))
1105                 return -EFAULT;
1106         if (put_user(urb->actual_length, &userurb->actual_length))
1107                 return -EFAULT;
1108         if (put_user(urb->error_count, &userurb->error_count))
1109                 return -EFAULT;
1110
1111         if (usb_pipeisoc(urb->pipe)) {
1112                 for (i = 0; i < urb->number_of_packets; i++) {
1113                         if (put_user(urb->iso_frame_desc[i].actual_length,
1114                                      &userurb->iso_frame_desc[i].actual_length))
1115                                 return -EFAULT;
1116                         if (put_user(urb->iso_frame_desc[i].status,
1117                                      &userurb->iso_frame_desc[i].status))
1118                                 return -EFAULT;
1119                 }
1120         }
1121
1122         free_async(as);
1123
1124         if (put_user(addr, (void __user * __user *)arg))
1125                 return -EFAULT;
1126         return 0;
1127 }
1128
1129 static struct async* reap_as(struct dev_state *ps)
1130 {
1131         DECLARE_WAITQUEUE(wait, current);
1132         struct async *as = NULL;
1133         struct usb_device *dev = ps->dev;
1134
1135         add_wait_queue(&ps->wait, &wait);
1136         for (;;) {
1137                 __set_current_state(TASK_INTERRUPTIBLE);
1138                 if ((as = async_getcompleted(ps)))
1139                         break;
1140                 if (signal_pending(current))
1141                         break;
1142                 usb_unlock_device(dev);
1143                 schedule();
1144                 usb_lock_device(dev);
1145         }
1146         remove_wait_queue(&ps->wait, &wait);
1147         set_current_state(TASK_RUNNING);
1148         return as;
1149 }
1150
1151 static int proc_reapurb(struct dev_state *ps, void __user *arg)
1152 {
1153         struct async *as = reap_as(ps);
1154         if (as)
1155                 return processcompl(as, (void __user * __user *)arg);
1156         if (signal_pending(current))
1157                 return -EINTR;
1158         return -EIO;
1159 }
1160
1161 static int proc_reapurbnonblock(struct dev_state *ps, void __user *arg)
1162 {
1163         struct async *as;
1164
1165         if (!(as = async_getcompleted(ps)))
1166                 return -EAGAIN;
1167         return processcompl(as, (void __user * __user *)arg);
1168 }
1169
1170 #ifdef CONFIG_COMPAT
1171
1172 static int get_urb32(struct usbdevfs_urb *kurb,
1173                      struct usbdevfs_urb32 __user *uurb)
1174 {
1175         __u32  uptr;
1176         if (get_user(kurb->type, &uurb->type) ||
1177             __get_user(kurb->endpoint, &uurb->endpoint) ||
1178             __get_user(kurb->status, &uurb->status) ||
1179             __get_user(kurb->flags, &uurb->flags) ||
1180             __get_user(kurb->buffer_length, &uurb->buffer_length) ||
1181             __get_user(kurb->actual_length, &uurb->actual_length) ||
1182             __get_user(kurb->start_frame, &uurb->start_frame) ||
1183             __get_user(kurb->number_of_packets, &uurb->number_of_packets) ||
1184             __get_user(kurb->error_count, &uurb->error_count) ||
1185             __get_user(kurb->signr, &uurb->signr))
1186                 return -EFAULT;
1187
1188         if (__get_user(uptr, &uurb->buffer))
1189                 return -EFAULT;
1190         kurb->buffer = compat_ptr(uptr);
1191         if (__get_user(uptr, &uurb->buffer))
1192                 return -EFAULT;
1193         kurb->usercontext = compat_ptr(uptr);
1194
1195         return 0;
1196 }
1197
1198 static int proc_submiturb_compat(struct dev_state *ps, void __user *arg)
1199 {
1200         struct usbdevfs_urb uurb;
1201
1202         if (get_urb32(&uurb,(struct usbdevfs_urb32 *)arg))
1203                 return -EFAULT;
1204
1205         return proc_do_submiturb(ps, &uurb, ((struct usbdevfs_urb32 __user *)arg)->iso_frame_desc, arg);
1206 }
1207
1208 static int processcompl_compat(struct async *as, void __user * __user *arg)
1209 {
1210         struct urb *urb = as->urb;
1211         struct usbdevfs_urb32 __user *userurb = as->userurb;
1212         void __user *addr = as->userurb;
1213         unsigned int i;
1214
1215         if (as->userbuffer)
1216                 if (copy_to_user(as->userbuffer, urb->transfer_buffer, urb->transfer_buffer_length))
1217                         return -EFAULT;
1218         if (put_user(urb->status, &userurb->status))
1219                 return -EFAULT;
1220         if (put_user(urb->actual_length, &userurb->actual_length))
1221                 return -EFAULT;
1222         if (put_user(urb->error_count, &userurb->error_count))
1223                 return -EFAULT;
1224
1225         if (usb_pipeisoc(urb->pipe)) {
1226                 for (i = 0; i < urb->number_of_packets; i++) {
1227                         if (put_user(urb->iso_frame_desc[i].actual_length,
1228                                      &userurb->iso_frame_desc[i].actual_length))
1229                                 return -EFAULT;
1230                         if (put_user(urb->iso_frame_desc[i].status,
1231                                      &userurb->iso_frame_desc[i].status))
1232                                 return -EFAULT;
1233                 }
1234         }
1235
1236         free_async(as);
1237         if (put_user((u32)(u64)addr, (u32 __user *)arg))
1238                 return -EFAULT;
1239         return 0;
1240 }
1241
1242 static int proc_reapurb_compat(struct dev_state *ps, void __user *arg)
1243 {
1244         struct async *as = reap_as(ps);
1245         if (as)
1246                 return processcompl_compat(as, (void __user * __user *)arg);
1247         if (signal_pending(current))
1248                 return -EINTR;
1249         return -EIO;
1250 }
1251
1252 static int proc_reapurbnonblock_compat(struct dev_state *ps, void __user *arg)
1253 {
1254         struct async *as;
1255
1256         if (!(as = async_getcompleted(ps)))
1257                 return -EAGAIN;
1258         return processcompl_compat(as, (void __user * __user *)arg);
1259 }
1260
1261 #endif
1262
1263 static int proc_disconnectsignal(struct dev_state *ps, void __user *arg)
1264 {
1265         struct usbdevfs_disconnectsignal ds;
1266
1267         if (copy_from_user(&ds, arg, sizeof(ds)))
1268                 return -EFAULT;
1269         if (ds.signr != 0 && (ds.signr < SIGRTMIN || ds.signr > SIGRTMAX))
1270                 return -EINVAL;
1271         ps->discsignr = ds.signr;
1272         ps->disccontext = ds.context;
1273         return 0;
1274 }
1275
1276 static int proc_claiminterface(struct dev_state *ps, void __user *arg)
1277 {
1278         unsigned int ifnum;
1279
1280         if (get_user(ifnum, (unsigned int __user *)arg))
1281                 return -EFAULT;
1282         return claimintf(ps, ifnum);
1283 }
1284
1285 static int proc_releaseinterface(struct dev_state *ps, void __user *arg)
1286 {
1287         unsigned int ifnum;
1288         int ret;
1289
1290         if (get_user(ifnum, (unsigned int __user *)arg))
1291                 return -EFAULT;
1292         if ((ret = releaseintf(ps, ifnum)) < 0)
1293                 return ret;
1294         destroy_async_on_interface (ps, ifnum);
1295         return 0;
1296 }
1297
1298 static int proc_ioctl(struct dev_state *ps, struct usbdevfs_ioctl *ctl)
1299 {
1300         int                     size;
1301         void                    *buf = NULL;
1302         int                     retval = 0;
1303         struct usb_interface    *intf = NULL;
1304         struct usb_driver       *driver = NULL;
1305
1306         /* alloc buffer */
1307         if ((size = _IOC_SIZE (ctl->ioctl_code)) > 0) {
1308                 if ((buf = kmalloc (size, GFP_KERNEL)) == NULL)
1309                         return -ENOMEM;
1310                 if ((_IOC_DIR(ctl->ioctl_code) & _IOC_WRITE)) {
1311                         if (copy_from_user (buf, ctl->data, size)) {
1312                                 kfree(buf);
1313                                 return -EFAULT;
1314                         }
1315                 } else {
1316                         memset (buf, 0, size);
1317                 }
1318         }
1319
1320         if (!connected(ps->dev)) {
1321                 kfree(buf);
1322                 return -ENODEV;
1323         }
1324
1325         if (ps->dev->state != USB_STATE_CONFIGURED)
1326                 retval = -EHOSTUNREACH;
1327         else if (!(intf = usb_ifnum_to_if (ps->dev, ctl->ifno)))
1328                retval = -EINVAL;
1329         else switch (ctl->ioctl_code) {
1330
1331         /* disconnect kernel driver from interface */
1332         case USBDEVFS_DISCONNECT:
1333
1334                 down_write(&usb_bus_type.subsys.rwsem);
1335                 if (intf->dev.driver) {
1336                         driver = to_usb_driver(intf->dev.driver);
1337                         dev_dbg (&intf->dev, "disconnect by usbfs\n");
1338                         usb_driver_release_interface(driver, intf);
1339                 } else
1340                         retval = -ENODATA;
1341                 up_write(&usb_bus_type.subsys.rwsem);
1342                 break;
1343
1344         /* let kernel drivers try to (re)bind to the interface */
1345         case USBDEVFS_CONNECT:
1346                 usb_unlock_device(ps->dev);
1347                 bus_rescan_devices(intf->dev.bus);
1348                 usb_lock_device(ps->dev);
1349                 break;
1350
1351         /* talk directly to the interface's driver */
1352         default:
1353                 down_read(&usb_bus_type.subsys.rwsem);
1354                 if (intf->dev.driver)
1355                         driver = to_usb_driver(intf->dev.driver);
1356                 if (driver == NULL || driver->ioctl == NULL) {
1357                         retval = -ENOTTY;
1358                 } else {
1359                         retval = driver->ioctl (intf, ctl->ioctl_code, buf);
1360                         if (retval == -ENOIOCTLCMD)
1361                                 retval = -ENOTTY;
1362                 }
1363                 up_read(&usb_bus_type.subsys.rwsem);
1364         }
1365
1366         /* cleanup and return */
1367         if (retval >= 0
1368                         && (_IOC_DIR (ctl->ioctl_code) & _IOC_READ) != 0
1369                         && size > 0
1370                         && copy_to_user (ctl->data, buf, size) != 0)
1371                 retval = -EFAULT;
1372
1373         kfree(buf);
1374         return retval;
1375 }
1376
1377 static int proc_ioctl_default(struct dev_state *ps, void __user *arg)
1378 {
1379         struct usbdevfs_ioctl   ctrl;
1380
1381         if (copy_from_user(&ctrl, arg, sizeof (ctrl)))
1382                 return -EFAULT;
1383         return proc_ioctl(ps, &ctrl);
1384 }
1385
1386 #ifdef CONFIG_COMPAT
1387 static int proc_ioctl_compat(struct dev_state *ps, compat_uptr_t arg)
1388 {
1389         struct usbdevfs_ioctl32 __user *uioc;
1390         struct usbdevfs_ioctl ctrl;
1391         u32 udata;
1392
1393         uioc = compat_ptr((long)arg);
1394         if (get_user(ctrl.ifno, &uioc->ifno) ||
1395             get_user(ctrl.ioctl_code, &uioc->ioctl_code) ||
1396             __get_user(udata, &uioc->data))
1397                 return -EFAULT;
1398         ctrl.data = compat_ptr(udata);
1399
1400         return proc_ioctl(ps, &ctrl);
1401 }
1402 #endif
1403
1404 /*
1405  * NOTE:  All requests here that have interface numbers as parameters
1406  * are assuming that somehow the configuration has been prevented from
1407  * changing.  But there's no mechanism to ensure that...
1408  */
1409 static int usbdev_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
1410 {
1411         struct dev_state *ps = (struct dev_state *)file->private_data;
1412         struct usb_device *dev = ps->dev;
1413         void __user *p = (void __user *)arg;
1414         int ret = -ENOTTY;
1415
1416         if (!(file->f_mode & FMODE_WRITE))
1417                 return -EPERM;
1418         usb_lock_device(dev);
1419         if (!connected(dev)) {
1420                 usb_unlock_device(dev);
1421                 return -ENODEV;
1422         }
1423
1424         switch (cmd) {
1425         case USBDEVFS_CONTROL:
1426                 snoop(&dev->dev, "%s: CONTROL\n", __FUNCTION__);
1427                 ret = proc_control(ps, p);
1428                 if (ret >= 0)
1429                         inode->i_mtime = CURRENT_TIME;
1430                 break;
1431
1432         case USBDEVFS_BULK:
1433                 snoop(&dev->dev, "%s: BULK\n", __FUNCTION__);
1434                 ret = proc_bulk(ps, p);
1435                 if (ret >= 0)
1436                         inode->i_mtime = CURRENT_TIME;
1437                 break;
1438
1439         case USBDEVFS_RESETEP:
1440                 snoop(&dev->dev, "%s: RESETEP\n", __FUNCTION__);
1441                 ret = proc_resetep(ps, p);
1442                 if (ret >= 0)
1443                         inode->i_mtime = CURRENT_TIME;
1444                 break;
1445
1446         case USBDEVFS_RESET:
1447                 snoop(&dev->dev, "%s: RESET\n", __FUNCTION__);
1448                 ret = proc_resetdevice(ps);
1449                 break;
1450
1451         case USBDEVFS_CLEAR_HALT:
1452                 snoop(&dev->dev, "%s: CLEAR_HALT\n", __FUNCTION__);
1453                 ret = proc_clearhalt(ps, p);
1454                 if (ret >= 0)
1455                         inode->i_mtime = CURRENT_TIME;
1456                 break;
1457
1458         case USBDEVFS_GETDRIVER:
1459                 snoop(&dev->dev, "%s: GETDRIVER\n", __FUNCTION__);
1460                 ret = proc_getdriver(ps, p);
1461                 break;
1462
1463         case USBDEVFS_CONNECTINFO:
1464                 snoop(&dev->dev, "%s: CONNECTINFO\n", __FUNCTION__);
1465                 ret = proc_connectinfo(ps, p);
1466                 break;
1467
1468         case USBDEVFS_SETINTERFACE:
1469                 snoop(&dev->dev, "%s: SETINTERFACE\n", __FUNCTION__);
1470                 ret = proc_setintf(ps, p);
1471                 break;
1472
1473         case USBDEVFS_SETCONFIGURATION:
1474                 snoop(&dev->dev, "%s: SETCONFIGURATION\n", __FUNCTION__);
1475                 ret = proc_setconfig(ps, p);
1476                 break;
1477
1478         case USBDEVFS_SUBMITURB:
1479                 snoop(&dev->dev, "%s: SUBMITURB\n", __FUNCTION__);
1480                 ret = proc_submiturb(ps, p);
1481                 if (ret >= 0)
1482                         inode->i_mtime = CURRENT_TIME;
1483                 break;
1484
1485 #ifdef CONFIG_COMPAT
1486
1487         case USBDEVFS_SUBMITURB32:
1488                 snoop(&dev->dev, "%s: SUBMITURB32\n", __FUNCTION__);
1489                 ret = proc_submiturb_compat(ps, p);
1490                 if (ret >= 0)
1491                         inode->i_mtime = CURRENT_TIME;
1492                 break;
1493
1494         case USBDEVFS_REAPURB32:
1495                 snoop(&dev->dev, "%s: REAPURB32\n", __FUNCTION__);
1496                 ret = proc_reapurb_compat(ps, p);
1497                 break;
1498
1499         case USBDEVFS_REAPURBNDELAY32:
1500                 snoop(&dev->dev, "%s: REAPURBDELAY32\n", __FUNCTION__);
1501                 ret = proc_reapurbnonblock_compat(ps, p);
1502                 break;
1503
1504         case USBDEVFS_IOCTL32:
1505                 snoop(&dev->dev, "%s: IOCTL\n", __FUNCTION__);
1506                 ret = proc_ioctl_compat(ps, (compat_uptr_t)(long)p);
1507                 break;
1508 #endif
1509
1510         case USBDEVFS_DISCARDURB:
1511                 snoop(&dev->dev, "%s: DISCARDURB\n", __FUNCTION__);
1512                 ret = proc_unlinkurb(ps, p);
1513                 break;
1514
1515         case USBDEVFS_REAPURB:
1516                 snoop(&dev->dev, "%s: REAPURB\n", __FUNCTION__);
1517                 ret = proc_reapurb(ps, p);
1518                 break;
1519
1520         case USBDEVFS_REAPURBNDELAY:
1521                 snoop(&dev->dev, "%s: REAPURBDELAY\n", __FUNCTION__);
1522                 ret = proc_reapurbnonblock(ps, p);
1523                 break;
1524
1525         case USBDEVFS_DISCSIGNAL:
1526                 snoop(&dev->dev, "%s: DISCSIGNAL\n", __FUNCTION__);
1527                 ret = proc_disconnectsignal(ps, p);
1528                 break;
1529
1530         case USBDEVFS_CLAIMINTERFACE:
1531                 snoop(&dev->dev, "%s: CLAIMINTERFACE\n", __FUNCTION__);
1532                 ret = proc_claiminterface(ps, p);
1533                 break;
1534
1535         case USBDEVFS_RELEASEINTERFACE:
1536                 snoop(&dev->dev, "%s: RELEASEINTERFACE\n", __FUNCTION__);
1537                 ret = proc_releaseinterface(ps, p);
1538                 break;
1539
1540         case USBDEVFS_IOCTL:
1541                 snoop(&dev->dev, "%s: IOCTL\n", __FUNCTION__);
1542                 ret = proc_ioctl_default(ps, p);
1543                 break;
1544         }
1545         usb_unlock_device(dev);
1546         if (ret >= 0)
1547                 inode->i_atime = CURRENT_TIME;
1548         return ret;
1549 }
1550
1551 /* No kernel lock - fine */
1552 static unsigned int usbdev_poll(struct file *file, struct poll_table_struct *wait)
1553 {
1554         struct dev_state *ps = (struct dev_state *)file->private_data;
1555         unsigned int mask = 0;
1556
1557         poll_wait(file, &ps->wait, wait);
1558         if (file->f_mode & FMODE_WRITE && !list_empty(&ps->async_completed))
1559                 mask |= POLLOUT | POLLWRNORM;
1560         if (!connected(ps->dev))
1561                 mask |= POLLERR | POLLHUP;
1562         return mask;
1563 }
1564
1565 struct file_operations usbfs_device_file_operations = {
1566         .llseek =       usbdev_lseek,
1567         .read =         usbdev_read,
1568         .poll =         usbdev_poll,
1569         .ioctl =        usbdev_ioctl,
1570         .open =         usbdev_open,
1571         .release =      usbdev_release,
1572 };
1573
1574 static void usbdev_add(struct usb_device *dev)
1575 {
1576         int minor = ((dev->bus->busnum-1) * 128) + (dev->devnum-1);
1577
1578         dev->class_dev = class_device_create(usb_device_class, NULL,
1579                                 MKDEV(USB_DEVICE_MAJOR, minor), &dev->dev,
1580                                 "usbdev%d.%d", dev->bus->busnum, dev->devnum);
1581
1582         dev->class_dev->class_data = dev;
1583 }
1584
1585 static void usbdev_remove(struct usb_device *dev)
1586 {
1587         class_device_unregister(dev->class_dev);
1588 }
1589
1590 static int usbdev_notify(struct notifier_block *self, unsigned long action,
1591                          void *dev)
1592 {
1593         switch (action) {
1594         case USB_DEVICE_ADD:
1595                 usbdev_add(dev);
1596                 break;
1597         case USB_DEVICE_REMOVE:
1598                 usbdev_remove(dev);
1599                 break;
1600         }
1601         return NOTIFY_OK;
1602 }
1603
1604 static struct notifier_block usbdev_nb = {
1605         .notifier_call =        usbdev_notify,
1606 };
1607
1608 static struct cdev usb_device_cdev = {
1609         .kobj   = {.name = "usb_device", },
1610         .owner  = THIS_MODULE,
1611 };
1612
1613 int __init usbdev_init(void)
1614 {
1615         int retval;
1616
1617         retval = register_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX,
1618                         "usb_device");
1619         if (retval) {
1620                 err("unable to register minors for usb_device");
1621                 goto out;
1622         }
1623         cdev_init(&usb_device_cdev, &usbfs_device_file_operations);
1624         retval = cdev_add(&usb_device_cdev, USB_DEVICE_DEV, USB_DEVICE_MAX);
1625         if (retval) {
1626                 err("unable to get usb_device major %d", USB_DEVICE_MAJOR);
1627                 goto error_cdev;
1628         }
1629         usb_device_class = class_create(THIS_MODULE, "usb_device");
1630         if (IS_ERR(usb_device_class)) {
1631                 err("unable to register usb_device class");
1632                 retval = PTR_ERR(usb_device_class);
1633                 goto error_class;
1634         }
1635
1636         usb_register_notify(&usbdev_nb);
1637
1638 out:
1639         return retval;
1640
1641 error_class:
1642         usb_device_class = NULL;
1643         cdev_del(&usb_device_cdev);
1644
1645 error_cdev:
1646         unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
1647         goto out;
1648 }
1649
1650 void usbdev_cleanup(void)
1651 {
1652         usb_unregister_notify(&usbdev_nb);
1653         class_destroy(usb_device_class);
1654         cdev_del(&usb_device_cdev);
1655         unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
1656 }
1657