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