Revert "[PATCH] USB: move usb_device_class class devices to be real devices"
[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 <linux/security.h>
51 #include <asm/uaccess.h>
52 #include <asm/byteorder.h>
53 #include <linux/moduleparam.h>
54
55 #include "hcd.h"        /* for usbcore internals */
56 #include "usb.h"
57
58 #define USB_MAXBUS                      64
59 #define USB_DEVICE_MAX                  USB_MAXBUS * 128
60 static struct class *usb_device_class;
61
62 struct async {
63         struct list_head asynclist;
64         struct dev_state *ps;
65         pid_t pid;
66         uid_t uid, euid;
67         unsigned int signr;
68         unsigned int ifnum;
69         void __user *userbuffer;
70         void __user *userurb;
71         struct urb *urb;
72         u32 secid;
73 };
74
75 static int usbfs_snoop = 0;
76 module_param (usbfs_snoop, bool, S_IRUGO | S_IWUSR);
77 MODULE_PARM_DESC (usbfs_snoop, "true to log all usbfs traffic");
78
79 #define snoop(dev, format, arg...)                              \
80         do {                                                    \
81                 if (usbfs_snoop)                                \
82                         dev_info( dev , format , ## arg);       \
83         } while (0)
84
85 #define USB_DEVICE_DEV          MKDEV(USB_DEVICE_MAJOR, 0)
86
87
88 #define MAX_USBFS_BUFFER_SIZE   16384
89
90 static inline int connected (struct usb_device *dev)
91 {
92         return dev->state != USB_STATE_NOTATTACHED;
93 }
94
95 static loff_t usbdev_lseek(struct file *file, loff_t offset, int orig)
96 {
97         loff_t ret;
98
99         lock_kernel();
100
101         switch (orig) {
102         case 0:
103                 file->f_pos = offset;
104                 ret = file->f_pos;
105                 break;
106         case 1:
107                 file->f_pos += offset;
108                 ret = file->f_pos;
109                 break;
110         case 2:
111         default:
112                 ret = -EINVAL;
113         }
114
115         unlock_kernel();
116         return ret;
117 }
118
119 static ssize_t usbdev_read(struct file *file, char __user *buf, size_t nbytes, loff_t *ppos)
120 {
121         struct dev_state *ps = (struct dev_state *)file->private_data;
122         struct usb_device *dev = ps->dev;
123         ssize_t ret = 0;
124         unsigned len;
125         loff_t pos;
126         int i;
127
128         pos = *ppos;
129         usb_lock_device(dev);
130         if (!connected(dev)) {
131                 ret = -ENODEV;
132                 goto err;
133         } else if (pos < 0) {
134                 ret = -EINVAL;
135                 goto err;
136         }
137
138         if (pos < sizeof(struct usb_device_descriptor)) {
139                 struct usb_device_descriptor temp_desc ; /* 18 bytes - fits on the stack */
140
141                 memcpy(&temp_desc, &dev->descriptor, sizeof(dev->descriptor));
142                 le16_to_cpus(&temp_desc.bcdUSB);
143                 le16_to_cpus(&temp_desc.idVendor);
144                 le16_to_cpus(&temp_desc.idProduct);
145                 le16_to_cpus(&temp_desc.bcdDevice);
146
147                 len = sizeof(struct usb_device_descriptor) - pos;
148                 if (len > nbytes)
149                         len = nbytes;
150                 if (copy_to_user(buf, ((char *)&temp_desc) + pos, len)) {
151                         ret = -EFAULT;
152                         goto err;
153                 }
154
155                 *ppos += len;
156                 buf += len;
157                 nbytes -= len;
158                 ret += len;
159         }
160
161         pos = sizeof(struct usb_device_descriptor);
162         for (i = 0; nbytes && i < dev->descriptor.bNumConfigurations; i++) {
163                 struct usb_config_descriptor *config =
164                         (struct usb_config_descriptor *)dev->rawdescriptors[i];
165                 unsigned int length = le16_to_cpu(config->wTotalLength);
166
167                 if (*ppos < pos + length) {
168
169                         /* The descriptor may claim to be longer than it
170                          * really is.  Here is the actual allocated length. */
171                         unsigned alloclen =
172                                 le16_to_cpu(dev->config[i].desc.wTotalLength);
173
174                         len = length - (*ppos - pos);
175                         if (len > nbytes)
176                                 len = nbytes;
177
178                         /* Simply don't write (skip over) unallocated parts */
179                         if (alloclen > (*ppos - pos)) {
180                                 alloclen -= (*ppos - pos);
181                                 if (copy_to_user(buf,
182                                     dev->rawdescriptors[i] + (*ppos - pos),
183                                     min(len, alloclen))) {
184                                         ret = -EFAULT;
185                                         goto err;
186                                 }
187                         }
188
189                         *ppos += len;
190                         buf += len;
191                         nbytes -= len;
192                         ret += len;
193                 }
194
195                 pos += length;
196         }
197
198 err:
199         usb_unlock_device(dev);
200         return ret;
201 }
202
203 /*
204  * async list handling
205  */
206
207 static struct async *alloc_async(unsigned int numisoframes)
208 {
209         unsigned int assize = sizeof(struct async) + numisoframes * sizeof(struct usb_iso_packet_descriptor);
210         struct async *as = kzalloc(assize, GFP_KERNEL);
211
212         if (!as)
213                 return NULL;
214         as->urb = usb_alloc_urb(numisoframes, GFP_KERNEL);
215         if (!as->urb) {
216                 kfree(as);
217                 return NULL;
218         }
219         return as;
220 }
221
222 static void free_async(struct async *as)
223 {
224         kfree(as->urb->transfer_buffer);
225         kfree(as->urb->setup_packet);
226         usb_free_urb(as->urb);
227         kfree(as);
228 }
229
230 static inline void async_newpending(struct async *as)
231 {
232         struct dev_state *ps = as->ps;
233         unsigned long flags;
234         
235         spin_lock_irqsave(&ps->lock, flags);
236         list_add_tail(&as->asynclist, &ps->async_pending);
237         spin_unlock_irqrestore(&ps->lock, flags);
238 }
239
240 static inline void async_removepending(struct async *as)
241 {
242         struct dev_state *ps = as->ps;
243         unsigned long flags;
244         
245         spin_lock_irqsave(&ps->lock, flags);
246         list_del_init(&as->asynclist);
247         spin_unlock_irqrestore(&ps->lock, flags);
248 }
249
250 static inline struct async *async_getcompleted(struct dev_state *ps)
251 {
252         unsigned long flags;
253         struct async *as = NULL;
254
255         spin_lock_irqsave(&ps->lock, flags);
256         if (!list_empty(&ps->async_completed)) {
257                 as = list_entry(ps->async_completed.next, struct async, asynclist);
258                 list_del_init(&as->asynclist);
259         }
260         spin_unlock_irqrestore(&ps->lock, flags);
261         return as;
262 }
263
264 static inline struct async *async_getpending(struct dev_state *ps, void __user *userurb)
265 {
266         unsigned long flags;
267         struct async *as;
268
269         spin_lock_irqsave(&ps->lock, flags);
270         list_for_each_entry(as, &ps->async_pending, asynclist)
271                 if (as->userurb == userurb) {
272                         list_del_init(&as->asynclist);
273                         spin_unlock_irqrestore(&ps->lock, flags);
274                         return as;
275                 }
276         spin_unlock_irqrestore(&ps->lock, flags);
277         return NULL;
278 }
279
280 static void snoop_urb(struct urb *urb, void __user *userurb)
281 {
282         int j;
283         unsigned char *data = urb->transfer_buffer;
284
285         if (!usbfs_snoop)
286                 return;
287
288         if (urb->pipe & USB_DIR_IN)
289                 dev_info(&urb->dev->dev, "direction=IN\n");
290         else
291                 dev_info(&urb->dev->dev, "direction=OUT\n");
292         dev_info(&urb->dev->dev, "userurb=%p\n", userurb);
293         dev_info(&urb->dev->dev, "transfer_buffer_length=%d\n",
294                  urb->transfer_buffer_length);
295         dev_info(&urb->dev->dev, "actual_length=%d\n", urb->actual_length);
296         dev_info(&urb->dev->dev, "data: ");
297         for (j = 0; j < urb->transfer_buffer_length; ++j)
298                 printk ("%02x ", data[j]);
299         printk("\n");
300 }
301
302 static void async_completed(struct urb *urb, struct pt_regs *regs)
303 {
304         struct async *as = (struct async *)urb->context;
305         struct dev_state *ps = as->ps;
306         struct siginfo sinfo;
307
308         spin_lock(&ps->lock);
309         list_move_tail(&as->asynclist, &ps->async_completed);
310         spin_unlock(&ps->lock);
311         if (as->signr) {
312                 sinfo.si_signo = as->signr;
313                 sinfo.si_errno = as->urb->status;
314                 sinfo.si_code = SI_ASYNCIO;
315                 sinfo.si_addr = as->userurb;
316                 kill_proc_info_as_uid(as->signr, &sinfo, as->pid, as->uid, 
317                                       as->euid, as->secid);
318         }
319         snoop(&urb->dev->dev, "urb complete\n");
320         snoop_urb(urb, as->userurb);
321         wake_up(&ps->wait);
322 }
323
324 static void destroy_async (struct dev_state *ps, struct list_head *list)
325 {
326         struct async *as;
327         unsigned long flags;
328
329         spin_lock_irqsave(&ps->lock, flags);
330         while (!list_empty(list)) {
331                 as = list_entry(list->next, struct async, asynclist);
332                 list_del_init(&as->asynclist);
333
334                 /* drop the spinlock so the completion handler can run */
335                 spin_unlock_irqrestore(&ps->lock, flags);
336                 usb_kill_urb(as->urb);
337                 spin_lock_irqsave(&ps->lock, flags);
338         }
339         spin_unlock_irqrestore(&ps->lock, flags);
340         as = async_getcompleted(ps);
341         while (as) {
342                 free_async(as);
343                 as = async_getcompleted(ps);
344         }
345 }
346
347 static void destroy_async_on_interface (struct dev_state *ps, unsigned int ifnum)
348 {
349         struct list_head *p, *q, hitlist;
350         unsigned long flags;
351
352         INIT_LIST_HEAD(&hitlist);
353         spin_lock_irqsave(&ps->lock, flags);
354         list_for_each_safe(p, q, &ps->async_pending)
355                 if (ifnum == list_entry(p, struct async, asynclist)->ifnum)
356                         list_move_tail(p, &hitlist);
357         spin_unlock_irqrestore(&ps->lock, flags);
358         destroy_async(ps, &hitlist);
359 }
360
361 static inline void destroy_all_async(struct dev_state *ps)
362 {
363                 destroy_async(ps, &ps->async_pending);
364 }
365
366 /*
367  * interface claims are made only at the request of user level code,
368  * which can also release them (explicitly or by closing files).
369  * they're also undone when devices disconnect.
370  */
371
372 static int driver_probe (struct usb_interface *intf,
373                          const struct usb_device_id *id)
374 {
375         return -ENODEV;
376 }
377
378 static void driver_disconnect(struct usb_interface *intf)
379 {
380         struct dev_state *ps = usb_get_intfdata (intf);
381         unsigned int ifnum = intf->altsetting->desc.bInterfaceNumber;
382
383         if (!ps)
384                 return;
385
386         /* NOTE:  this relies on usbcore having canceled and completed
387          * all pending I/O requests; 2.6 does that.
388          */
389
390         if (likely(ifnum < 8*sizeof(ps->ifclaimed)))
391                 clear_bit(ifnum, &ps->ifclaimed);
392         else
393                 warn("interface number %u out of range", ifnum);
394
395         usb_set_intfdata (intf, NULL);
396
397         /* force async requests to complete */
398         destroy_async_on_interface(ps, ifnum);
399 }
400
401 struct usb_driver usbfs_driver = {
402         .name =         "usbfs",
403         .probe =        driver_probe,
404         .disconnect =   driver_disconnect,
405 };
406
407 static int claimintf(struct dev_state *ps, unsigned int ifnum)
408 {
409         struct usb_device *dev = ps->dev;
410         struct usb_interface *intf;
411         int err;
412
413         if (ifnum >= 8*sizeof(ps->ifclaimed))
414                 return -EINVAL;
415         /* already claimed */
416         if (test_bit(ifnum, &ps->ifclaimed))
417                 return 0;
418
419         /* lock against other changes to driver bindings */
420         down_write(&usb_bus_type.subsys.rwsem);
421         intf = usb_ifnum_to_if(dev, ifnum);
422         if (!intf)
423                 err = -ENOENT;
424         else
425                 err = usb_driver_claim_interface(&usbfs_driver, intf, ps);
426         up_write(&usb_bus_type.subsys.rwsem);
427         if (err == 0)
428                 set_bit(ifnum, &ps->ifclaimed);
429         return err;
430 }
431
432 static int releaseintf(struct dev_state *ps, unsigned int ifnum)
433 {
434         struct usb_device *dev;
435         struct usb_interface *intf;
436         int err;
437
438         err = -EINVAL;
439         if (ifnum >= 8*sizeof(ps->ifclaimed))
440                 return err;
441         dev = ps->dev;
442         /* lock against other changes to driver bindings */
443         down_write(&usb_bus_type.subsys.rwsem);
444         intf = usb_ifnum_to_if(dev, ifnum);
445         if (!intf)
446                 err = -ENOENT;
447         else if (test_and_clear_bit(ifnum, &ps->ifclaimed)) {
448                 usb_driver_release_interface(&usbfs_driver, intf);
449                 err = 0;
450         }
451         up_write(&usb_bus_type.subsys.rwsem);
452         return err;
453 }
454
455 static int checkintf(struct dev_state *ps, unsigned int ifnum)
456 {
457         if (ps->dev->state != USB_STATE_CONFIGURED)
458                 return -EHOSTUNREACH;
459         if (ifnum >= 8*sizeof(ps->ifclaimed))
460                 return -EINVAL;
461         if (test_bit(ifnum, &ps->ifclaimed))
462                 return 0;
463         /* if not yet claimed, claim it for the driver */
464         dev_warn(&ps->dev->dev, "usbfs: process %d (%s) did not claim interface %u before use\n",
465                current->pid, current->comm, ifnum);
466         return claimintf(ps, ifnum);
467 }
468
469 static int findintfep(struct usb_device *dev, unsigned int ep)
470 {
471         unsigned int i, j, e;
472         struct usb_interface *intf;
473         struct usb_host_interface *alts;
474         struct usb_endpoint_descriptor *endpt;
475
476         if (ep & ~(USB_DIR_IN|0xf))
477                 return -EINVAL;
478         if (!dev->actconfig)
479                 return -ESRCH;
480         for (i = 0; i < dev->actconfig->desc.bNumInterfaces; i++) {
481                 intf = dev->actconfig->interface[i];
482                 for (j = 0; j < intf->num_altsetting; j++) {
483                         alts = &intf->altsetting[j];
484                         for (e = 0; e < alts->desc.bNumEndpoints; e++) {
485                                 endpt = &alts->endpoint[e].desc;
486                                 if (endpt->bEndpointAddress == ep)
487                                         return alts->desc.bInterfaceNumber;
488                         }
489                 }
490         }
491         return -ENOENT; 
492 }
493
494 static int check_ctrlrecip(struct dev_state *ps, unsigned int requesttype, unsigned int index)
495 {
496         int ret = 0;
497
498         if (ps->dev->state != USB_STATE_ADDRESS
499          && ps->dev->state != USB_STATE_CONFIGURED)
500                 return -EHOSTUNREACH;
501         if (USB_TYPE_VENDOR == (USB_TYPE_MASK & requesttype))
502                 return 0;
503
504         index &= 0xff;
505         switch (requesttype & USB_RECIP_MASK) {
506         case USB_RECIP_ENDPOINT:
507                 if ((ret = findintfep(ps->dev, index)) >= 0)
508                         ret = checkintf(ps, ret);
509                 break;
510
511         case USB_RECIP_INTERFACE:
512                 ret = checkintf(ps, index);
513                 break;
514         }
515         return ret;
516 }
517
518 static struct usb_device *usbdev_lookup_minor(int minor)
519 {
520         struct class_device *class_dev;
521         struct usb_device *dev = NULL;
522
523         down(&usb_device_class->sem);
524         list_for_each_entry(class_dev, &usb_device_class->children, node) {
525                 if (class_dev->devt == MKDEV(USB_DEVICE_MAJOR, minor)) {
526                         dev = class_dev->class_data;
527                         break;
528                 }
529         }
530         up(&usb_device_class->sem);
531
532         return dev;
533 };
534
535 /*
536  * file operations
537  */
538 static int usbdev_open(struct inode *inode, struct file *file)
539 {
540         struct usb_device *dev = NULL;
541         struct dev_state *ps;
542         int ret;
543
544         /* 
545          * no locking necessary here, as chrdev_open has the kernel lock
546          * (still acquire the kernel lock for safety)
547          */
548         ret = -ENOMEM;
549         if (!(ps = kmalloc(sizeof(struct dev_state), GFP_KERNEL)))
550                 goto out_nolock;
551
552         lock_kernel();
553         ret = -ENOENT;
554         /* check if we are called from a real node or usbfs */
555         if (imajor(inode) == USB_DEVICE_MAJOR)
556                 dev = usbdev_lookup_minor(iminor(inode));
557         if (!dev)
558                 dev = inode->u.generic_ip;
559         if (!dev) {
560                 kfree(ps);
561                 goto out;
562         }
563         usb_get_dev(dev);
564         ret = 0;
565         ps->dev = dev;
566         ps->file = file;
567         spin_lock_init(&ps->lock);
568         INIT_LIST_HEAD(&ps->async_pending);
569         INIT_LIST_HEAD(&ps->async_completed);
570         init_waitqueue_head(&ps->wait);
571         ps->discsignr = 0;
572         ps->disc_pid = current->pid;
573         ps->disc_uid = current->uid;
574         ps->disc_euid = current->euid;
575         ps->disccontext = NULL;
576         ps->ifclaimed = 0;
577         security_task_getsecid(current, &ps->secid);
578         wmb();
579         list_add_tail(&ps->list, &dev->filelist);
580         file->private_data = ps;
581  out:
582         unlock_kernel();
583  out_nolock:
584         return ret;
585 }
586
587 static int usbdev_release(struct inode *inode, struct file *file)
588 {
589         struct dev_state *ps = (struct dev_state *)file->private_data;
590         struct usb_device *dev = ps->dev;
591         unsigned int ifnum;
592
593         usb_lock_device(dev);
594         list_del_init(&ps->list);
595         for (ifnum = 0; ps->ifclaimed && ifnum < 8*sizeof(ps->ifclaimed);
596                         ifnum++) {
597                 if (test_bit(ifnum, &ps->ifclaimed))
598                         releaseintf(ps, ifnum);
599         }
600         destroy_all_async(ps);
601         usb_unlock_device(dev);
602         usb_put_dev(dev);
603         ps->dev = NULL;
604         kfree(ps);
605         return 0;
606 }
607
608 static int proc_control(struct dev_state *ps, void __user *arg)
609 {
610         struct usb_device *dev = ps->dev;
611         struct usbdevfs_ctrltransfer ctrl;
612         unsigned int tmo;
613         unsigned char *tbuf;
614         int i, j, ret;
615
616         if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
617                 return -EFAULT;
618         if ((ret = check_ctrlrecip(ps, ctrl.bRequestType, ctrl.wIndex)))
619                 return ret;
620         if (ctrl.wLength > PAGE_SIZE)
621                 return -EINVAL;
622         if (!(tbuf = (unsigned char *)__get_free_page(GFP_KERNEL)))
623                 return -ENOMEM;
624         tmo = ctrl.timeout;
625         if (ctrl.bRequestType & 0x80) {
626                 if (ctrl.wLength && !access_ok(VERIFY_WRITE, ctrl.data, ctrl.wLength)) {
627                         free_page((unsigned long)tbuf);
628                         return -EINVAL;
629                 }
630                 snoop(&dev->dev, "control read: bRequest=%02x "
631                                 "bRrequestType=%02x wValue=%04x "
632                                 "wIndex=%04x wLength=%04x\n",
633                         ctrl.bRequest, ctrl.bRequestType, ctrl.wValue,
634                                 ctrl.wIndex, ctrl.wLength);
635
636                 usb_unlock_device(dev);
637                 i = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), ctrl.bRequest, ctrl.bRequestType,
638                                        ctrl.wValue, ctrl.wIndex, tbuf, ctrl.wLength, tmo);
639                 usb_lock_device(dev);
640                 if ((i > 0) && ctrl.wLength) {
641                         if (usbfs_snoop) {
642                                 dev_info(&dev->dev, "control read: data ");
643                                 for (j = 0; j < i; ++j)
644                                         printk("%02x ", (unsigned char)(tbuf)[j]);
645                                 printk("\n");
646                         }
647                         if (copy_to_user(ctrl.data, tbuf, i)) {
648                                 free_page((unsigned long)tbuf);
649                                 return -EFAULT;
650                         }
651                 }
652         } else {
653                 if (ctrl.wLength) {
654                         if (copy_from_user(tbuf, ctrl.data, ctrl.wLength)) {
655                                 free_page((unsigned long)tbuf);
656                                 return -EFAULT;
657                         }
658                 }
659                 snoop(&dev->dev, "control write: bRequest=%02x "
660                                 "bRrequestType=%02x wValue=%04x "
661                                 "wIndex=%04x wLength=%04x\n",
662                         ctrl.bRequest, ctrl.bRequestType, ctrl.wValue,
663                                 ctrl.wIndex, ctrl.wLength);
664                 if (usbfs_snoop) {
665                         dev_info(&dev->dev, "control write: data: ");
666                         for (j = 0; j < ctrl.wLength; ++j)
667                                 printk("%02x ", (unsigned char)(tbuf)[j]);
668                         printk("\n");
669                 }
670                 usb_unlock_device(dev);
671                 i = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), ctrl.bRequest, ctrl.bRequestType,
672                                        ctrl.wValue, ctrl.wIndex, tbuf, ctrl.wLength, tmo);
673                 usb_lock_device(dev);
674         }
675         free_page((unsigned long)tbuf);
676         if (i<0 && i != -EPIPE) {
677                 dev_printk(KERN_DEBUG, &dev->dev, "usbfs: USBDEVFS_CONTROL "
678                            "failed cmd %s rqt %u rq %u len %u ret %d\n",
679                            current->comm, ctrl.bRequestType, ctrl.bRequest,
680                            ctrl.wLength, i);
681         }
682         return i;
683 }
684
685 static int proc_bulk(struct dev_state *ps, void __user *arg)
686 {
687         struct usb_device *dev = ps->dev;
688         struct usbdevfs_bulktransfer bulk;
689         unsigned int tmo, len1, pipe;
690         int len2;
691         unsigned char *tbuf;
692         int i, j, ret;
693
694         if (copy_from_user(&bulk, arg, sizeof(bulk)))
695                 return -EFAULT;
696         if ((ret = findintfep(ps->dev, bulk.ep)) < 0)
697                 return ret;
698         if ((ret = checkintf(ps, ret)))
699                 return ret;
700         if (bulk.ep & USB_DIR_IN)
701                 pipe = usb_rcvbulkpipe(dev, bulk.ep & 0x7f);
702         else
703                 pipe = usb_sndbulkpipe(dev, bulk.ep & 0x7f);
704         if (!usb_maxpacket(dev, pipe, !(bulk.ep & USB_DIR_IN)))
705                 return -EINVAL;
706         len1 = bulk.len;
707         if (len1 > MAX_USBFS_BUFFER_SIZE)
708                 return -EINVAL;
709         if (!(tbuf = kmalloc(len1, GFP_KERNEL)))
710                 return -ENOMEM;
711         tmo = bulk.timeout;
712         if (bulk.ep & 0x80) {
713                 if (len1 && !access_ok(VERIFY_WRITE, bulk.data, len1)) {
714                         kfree(tbuf);
715                         return -EINVAL;
716                 }
717                 snoop(&dev->dev, "bulk read: len=0x%02x timeout=%04d\n",
718                         bulk.len, bulk.timeout);
719                 usb_unlock_device(dev);
720                 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
721                 usb_lock_device(dev);
722                 if (!i && len2) {
723                         if (usbfs_snoop) {
724                                 dev_info(&dev->dev, "bulk read: data ");
725                                 for (j = 0; j < len2; ++j)
726                                         printk("%02x ", (unsigned char)(tbuf)[j]);
727                                 printk("\n");
728                         }
729                         if (copy_to_user(bulk.data, tbuf, len2)) {
730                                 kfree(tbuf);
731                                 return -EFAULT;
732                         }
733                 }
734         } else {
735                 if (len1) {
736                         if (copy_from_user(tbuf, bulk.data, len1)) {
737                                 kfree(tbuf);
738                                 return -EFAULT;
739                         }
740                 }
741                 snoop(&dev->dev, "bulk write: len=0x%02x timeout=%04d\n",
742                         bulk.len, bulk.timeout);
743                 if (usbfs_snoop) {
744                         dev_info(&dev->dev, "bulk write: data: ");
745                         for (j = 0; j < len1; ++j)
746                                 printk("%02x ", (unsigned char)(tbuf)[j]);
747                         printk("\n");
748                 }
749                 usb_unlock_device(dev);
750                 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
751                 usb_lock_device(dev);
752         }
753         kfree(tbuf);
754         if (i < 0)
755                 return i;
756         return len2;
757 }
758
759 static int proc_resetep(struct dev_state *ps, void __user *arg)
760 {
761         unsigned int ep;
762         int ret;
763
764         if (get_user(ep, (unsigned int __user *)arg))
765                 return -EFAULT;
766         if ((ret = findintfep(ps->dev, ep)) < 0)
767                 return ret;
768         if ((ret = checkintf(ps, ret)))
769                 return ret;
770         usb_settoggle(ps->dev, ep & 0xf, !(ep & USB_DIR_IN), 0);
771         return 0;
772 }
773
774 static int proc_clearhalt(struct dev_state *ps, void __user *arg)
775 {
776         unsigned int ep;
777         int pipe;
778         int ret;
779
780         if (get_user(ep, (unsigned int __user *)arg))
781                 return -EFAULT;
782         if ((ret = findintfep(ps->dev, ep)) < 0)
783                 return ret;
784         if ((ret = checkintf(ps, ret)))
785                 return ret;
786         if (ep & USB_DIR_IN)
787                 pipe = usb_rcvbulkpipe(ps->dev, ep & 0x7f);
788         else
789                 pipe = usb_sndbulkpipe(ps->dev, ep & 0x7f);
790
791         return usb_clear_halt(ps->dev, pipe);
792 }
793                 
794
795 static int proc_getdriver(struct dev_state *ps, void __user *arg)
796 {
797         struct usbdevfs_getdriver gd;
798         struct usb_interface *intf;
799         int ret;
800
801         if (copy_from_user(&gd, arg, sizeof(gd)))
802                 return -EFAULT;
803         down_read(&usb_bus_type.subsys.rwsem);
804         intf = usb_ifnum_to_if(ps->dev, gd.interface);
805         if (!intf || !intf->dev.driver)
806                 ret = -ENODATA;
807         else {
808                 strncpy(gd.driver, intf->dev.driver->name,
809                                 sizeof(gd.driver));
810                 ret = (copy_to_user(arg, &gd, sizeof(gd)) ? -EFAULT : 0);
811         }
812         up_read(&usb_bus_type.subsys.rwsem);
813         return ret;
814 }
815
816 static int proc_connectinfo(struct dev_state *ps, void __user *arg)
817 {
818         struct usbdevfs_connectinfo ci;
819
820         ci.devnum = ps->dev->devnum;
821         ci.slow = ps->dev->speed == USB_SPEED_LOW;
822         if (copy_to_user(arg, &ci, sizeof(ci)))
823                 return -EFAULT;
824         return 0;
825 }
826
827 static int proc_resetdevice(struct dev_state *ps)
828 {
829         return usb_reset_composite_device(ps->dev, NULL);
830 }
831
832 static int proc_setintf(struct dev_state *ps, void __user *arg)
833 {
834         struct usbdevfs_setinterface setintf;
835         int ret;
836
837         if (copy_from_user(&setintf, arg, sizeof(setintf)))
838                 return -EFAULT;
839         if ((ret = checkintf(ps, setintf.interface)))
840                 return ret;
841         return usb_set_interface(ps->dev, setintf.interface,
842                         setintf.altsetting);
843 }
844
845 static int proc_setconfig(struct dev_state *ps, void __user *arg)
846 {
847         unsigned int u;
848         int status = 0;
849         struct usb_host_config *actconfig;
850
851         if (get_user(u, (unsigned int __user *)arg))
852                 return -EFAULT;
853
854         actconfig = ps->dev->actconfig;
855  
856         /* Don't touch the device if any interfaces are claimed.
857          * It could interfere with other drivers' operations, and if
858          * an interface is claimed by usbfs it could easily deadlock.
859          */
860         if (actconfig) {
861                 int i;
862  
863                 for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) {
864                         if (usb_interface_claimed(actconfig->interface[i])) {
865                                 dev_warn (&ps->dev->dev,
866                                         "usbfs: interface %d claimed by %s "
867                                         "while '%s' sets config #%d\n",
868                                         actconfig->interface[i]
869                                                 ->cur_altsetting
870                                                 ->desc.bInterfaceNumber,
871                                         actconfig->interface[i]
872                                                 ->dev.driver->name,
873                                         current->comm, u);
874                                 status = -EBUSY;
875                                 break;
876                         }
877                 }
878         }
879
880         /* SET_CONFIGURATION is often abused as a "cheap" driver reset,
881          * so avoid usb_set_configuration()'s kick to sysfs
882          */
883         if (status == 0) {
884                 if (actconfig && actconfig->desc.bConfigurationValue == u)
885                         status = usb_reset_configuration(ps->dev);
886                 else
887                         status = usb_set_configuration(ps->dev, u);
888         }
889
890         return status;
891 }
892
893 static int proc_do_submiturb(struct dev_state *ps, struct usbdevfs_urb *uurb,
894                              struct usbdevfs_iso_packet_desc __user *iso_frame_desc,
895                              void __user *arg)
896 {
897         struct usbdevfs_iso_packet_desc *isopkt = NULL;
898         struct usb_host_endpoint *ep;
899         struct async *as;
900         struct usb_ctrlrequest *dr = NULL;
901         unsigned int u, totlen, isofrmlen;
902         int ret, interval = 0, ifnum = -1;
903
904         if (uurb->flags & ~(USBDEVFS_URB_ISO_ASAP|USBDEVFS_URB_SHORT_NOT_OK|
905                            URB_NO_FSBR|URB_ZERO_PACKET))
906                 return -EINVAL;
907         if (!uurb->buffer)
908                 return -EINVAL;
909         if (uurb->signr != 0 && (uurb->signr < SIGRTMIN || uurb->signr > SIGRTMAX))
910                 return -EINVAL;
911         if (!(uurb->type == USBDEVFS_URB_TYPE_CONTROL && (uurb->endpoint & ~USB_ENDPOINT_DIR_MASK) == 0)) {
912                 if ((ifnum = findintfep(ps->dev, uurb->endpoint)) < 0)
913                         return ifnum;
914                 if ((ret = checkintf(ps, ifnum)))
915                         return ret;
916         }
917         if ((uurb->endpoint & USB_ENDPOINT_DIR_MASK) != 0)
918                 ep = ps->dev->ep_in [uurb->endpoint & USB_ENDPOINT_NUMBER_MASK];
919         else
920                 ep = ps->dev->ep_out [uurb->endpoint & USB_ENDPOINT_NUMBER_MASK];
921         if (!ep)
922                 return -ENOENT;
923         switch(uurb->type) {
924         case USBDEVFS_URB_TYPE_CONTROL:
925                 if ((ep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
926                                 != USB_ENDPOINT_XFER_CONTROL)
927                         return -EINVAL;
928                 /* min 8 byte setup packet, max 8 byte setup plus an arbitrary data stage */
929                 if (uurb->buffer_length < 8 || uurb->buffer_length > (8 + MAX_USBFS_BUFFER_SIZE))
930                         return -EINVAL;
931                 if (!(dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL)))
932                         return -ENOMEM;
933                 if (copy_from_user(dr, uurb->buffer, 8)) {
934                         kfree(dr);
935                         return -EFAULT;
936                 }
937                 if (uurb->buffer_length < (le16_to_cpup(&dr->wLength) + 8)) {
938                         kfree(dr);
939                         return -EINVAL;
940                 }
941                 if ((ret = check_ctrlrecip(ps, dr->bRequestType, le16_to_cpup(&dr->wIndex)))) {
942                         kfree(dr);
943                         return ret;
944                 }
945                 uurb->endpoint = (uurb->endpoint & ~USB_ENDPOINT_DIR_MASK) | (dr->bRequestType & USB_ENDPOINT_DIR_MASK);
946                 uurb->number_of_packets = 0;
947                 uurb->buffer_length = le16_to_cpup(&dr->wLength);
948                 uurb->buffer += 8;
949                 if (!access_ok((uurb->endpoint & USB_DIR_IN) ?  VERIFY_WRITE : VERIFY_READ, uurb->buffer, uurb->buffer_length)) {
950                         kfree(dr);
951                         return -EFAULT;
952                 }
953                 snoop(&ps->dev->dev, "control urb\n");
954                 break;
955
956         case USBDEVFS_URB_TYPE_BULK:
957                 switch (ep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) {
958                 case USB_ENDPOINT_XFER_CONTROL:
959                 case USB_ENDPOINT_XFER_ISOC:
960                         return -EINVAL;
961                 /* allow single-shot interrupt transfers, at bogus rates */
962                 }
963                 uurb->number_of_packets = 0;
964                 if (uurb->buffer_length > MAX_USBFS_BUFFER_SIZE)
965                         return -EINVAL;
966                 if (!access_ok((uurb->endpoint & USB_DIR_IN) ? VERIFY_WRITE : VERIFY_READ, uurb->buffer, uurb->buffer_length))
967                         return -EFAULT;
968                 snoop(&ps->dev->dev, "bulk urb\n");
969                 break;
970
971         case USBDEVFS_URB_TYPE_ISO:
972                 /* arbitrary limit */
973                 if (uurb->number_of_packets < 1 || uurb->number_of_packets > 128)
974                         return -EINVAL;
975                 if ((ep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
976                                 != USB_ENDPOINT_XFER_ISOC)
977                         return -EINVAL;
978                 interval = 1 << min (15, ep->desc.bInterval - 1);
979                 isofrmlen = sizeof(struct usbdevfs_iso_packet_desc) * uurb->number_of_packets;
980                 if (!(isopkt = kmalloc(isofrmlen, GFP_KERNEL)))
981                         return -ENOMEM;
982                 if (copy_from_user(isopkt, iso_frame_desc, isofrmlen)) {
983                         kfree(isopkt);
984                         return -EFAULT;
985                 }
986                 for (totlen = u = 0; u < uurb->number_of_packets; u++) {
987                         /* arbitrary limit, sufficient for USB 2.0 high-bandwidth iso */
988                         if (isopkt[u].length > 8192) {
989                                 kfree(isopkt);
990                                 return -EINVAL;
991                         }
992                         totlen += isopkt[u].length;
993                 }
994                 if (totlen > 32768) {
995                         kfree(isopkt);
996                         return -EINVAL;
997                 }
998                 uurb->buffer_length = totlen;
999                 snoop(&ps->dev->dev, "iso urb\n");
1000                 break;
1001
1002         case USBDEVFS_URB_TYPE_INTERRUPT:
1003                 uurb->number_of_packets = 0;
1004                 if ((ep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
1005                                 != USB_ENDPOINT_XFER_INT)
1006                         return -EINVAL;
1007                 if (ps->dev->speed == USB_SPEED_HIGH)
1008                         interval = 1 << min (15, ep->desc.bInterval - 1);
1009                 else
1010                         interval = ep->desc.bInterval;
1011                 if (uurb->buffer_length > MAX_USBFS_BUFFER_SIZE)
1012                         return -EINVAL;
1013                 if (!access_ok((uurb->endpoint & USB_DIR_IN) ? VERIFY_WRITE : VERIFY_READ, uurb->buffer, uurb->buffer_length))
1014                         return -EFAULT;
1015                 snoop(&ps->dev->dev, "interrupt urb\n");
1016                 break;
1017
1018         default:
1019                 return -EINVAL;
1020         }
1021         if (!(as = alloc_async(uurb->number_of_packets))) {
1022                 kfree(isopkt);
1023                 kfree(dr);
1024                 return -ENOMEM;
1025         }
1026         if (!(as->urb->transfer_buffer = kmalloc(uurb->buffer_length, GFP_KERNEL))) {
1027                 kfree(isopkt);
1028                 kfree(dr);
1029                 free_async(as);
1030                 return -ENOMEM;
1031         }
1032         as->urb->dev = ps->dev;
1033         as->urb->pipe = (uurb->type << 30) | __create_pipe(ps->dev, uurb->endpoint & 0xf) | (uurb->endpoint & USB_DIR_IN);
1034         as->urb->transfer_flags = uurb->flags;
1035         as->urb->transfer_buffer_length = uurb->buffer_length;
1036         as->urb->setup_packet = (unsigned char*)dr;
1037         as->urb->start_frame = uurb->start_frame;
1038         as->urb->number_of_packets = uurb->number_of_packets;
1039         as->urb->interval = interval;
1040         as->urb->context = as;
1041         as->urb->complete = async_completed;
1042         for (totlen = u = 0; u < uurb->number_of_packets; u++) {
1043                 as->urb->iso_frame_desc[u].offset = totlen;
1044                 as->urb->iso_frame_desc[u].length = isopkt[u].length;
1045                 totlen += isopkt[u].length;
1046         }
1047         kfree(isopkt);
1048         as->ps = ps;
1049         as->userurb = arg;
1050         if (uurb->endpoint & USB_DIR_IN)
1051                 as->userbuffer = uurb->buffer;
1052         else
1053                 as->userbuffer = NULL;
1054         as->signr = uurb->signr;
1055         as->ifnum = ifnum;
1056         as->pid = current->pid;
1057         as->uid = current->uid;
1058         as->euid = current->euid;
1059         security_task_getsecid(current, &as->secid);
1060         if (!(uurb->endpoint & USB_DIR_IN)) {
1061                 if (copy_from_user(as->urb->transfer_buffer, uurb->buffer, as->urb->transfer_buffer_length)) {
1062                         free_async(as);
1063                         return -EFAULT;
1064                 }
1065         }
1066         snoop(&as->urb->dev->dev, "submit urb\n");
1067         snoop_urb(as->urb, as->userurb);
1068         async_newpending(as);
1069         if ((ret = usb_submit_urb(as->urb, GFP_KERNEL))) {
1070                 dev_printk(KERN_DEBUG, &ps->dev->dev, "usbfs: usb_submit_urb returned %d\n", ret);
1071                 async_removepending(as);
1072                 free_async(as);
1073                 return ret;
1074         }
1075         return 0;
1076 }
1077
1078 static int proc_submiturb(struct dev_state *ps, void __user *arg)
1079 {
1080         struct usbdevfs_urb uurb;
1081
1082         if (copy_from_user(&uurb, arg, sizeof(uurb)))
1083                 return -EFAULT;
1084
1085         return proc_do_submiturb(ps, &uurb, (((struct usbdevfs_urb __user *)arg)->iso_frame_desc), arg);
1086 }
1087
1088 static int proc_unlinkurb(struct dev_state *ps, void __user *arg)
1089 {
1090         struct async *as;
1091
1092         as = async_getpending(ps, arg);
1093         if (!as)
1094                 return -EINVAL;
1095         usb_kill_urb(as->urb);
1096         return 0;
1097 }
1098
1099 static int processcompl(struct async *as, void __user * __user *arg)
1100 {
1101         struct urb *urb = as->urb;
1102         struct usbdevfs_urb __user *userurb = as->userurb;
1103         void __user *addr = as->userurb;
1104         unsigned int i;
1105
1106         if (as->userbuffer)
1107                 if (copy_to_user(as->userbuffer, urb->transfer_buffer, urb->transfer_buffer_length))
1108                         return -EFAULT;
1109         if (put_user(urb->status, &userurb->status))
1110                 return -EFAULT;
1111         if (put_user(urb->actual_length, &userurb->actual_length))
1112                 return -EFAULT;
1113         if (put_user(urb->error_count, &userurb->error_count))
1114                 return -EFAULT;
1115
1116         if (usb_pipeisoc(urb->pipe)) {
1117                 for (i = 0; i < urb->number_of_packets; i++) {
1118                         if (put_user(urb->iso_frame_desc[i].actual_length,
1119                                      &userurb->iso_frame_desc[i].actual_length))
1120                                 return -EFAULT;
1121                         if (put_user(urb->iso_frame_desc[i].status,
1122                                      &userurb->iso_frame_desc[i].status))
1123                                 return -EFAULT;
1124                 }
1125         }
1126
1127         free_async(as);
1128
1129         if (put_user(addr, (void __user * __user *)arg))
1130                 return -EFAULT;
1131         return 0;
1132 }
1133
1134 static struct async* reap_as(struct dev_state *ps)
1135 {
1136         DECLARE_WAITQUEUE(wait, current);
1137         struct async *as = NULL;
1138         struct usb_device *dev = ps->dev;
1139
1140         add_wait_queue(&ps->wait, &wait);
1141         for (;;) {
1142                 __set_current_state(TASK_INTERRUPTIBLE);
1143                 if ((as = async_getcompleted(ps)))
1144                         break;
1145                 if (signal_pending(current))
1146                         break;
1147                 usb_unlock_device(dev);
1148                 schedule();
1149                 usb_lock_device(dev);
1150         }
1151         remove_wait_queue(&ps->wait, &wait);
1152         set_current_state(TASK_RUNNING);
1153         return as;
1154 }
1155
1156 static int proc_reapurb(struct dev_state *ps, void __user *arg)
1157 {
1158         struct async *as = reap_as(ps);
1159         if (as)
1160                 return processcompl(as, (void __user * __user *)arg);
1161         if (signal_pending(current))
1162                 return -EINTR;
1163         return -EIO;
1164 }
1165
1166 static int proc_reapurbnonblock(struct dev_state *ps, void __user *arg)
1167 {
1168         struct async *as;
1169
1170         if (!(as = async_getcompleted(ps)))
1171                 return -EAGAIN;
1172         return processcompl(as, (void __user * __user *)arg);
1173 }
1174
1175 #ifdef CONFIG_COMPAT
1176
1177 static int get_urb32(struct usbdevfs_urb *kurb,
1178                      struct usbdevfs_urb32 __user *uurb)
1179 {
1180         __u32  uptr;
1181         if (get_user(kurb->type, &uurb->type) ||
1182             __get_user(kurb->endpoint, &uurb->endpoint) ||
1183             __get_user(kurb->status, &uurb->status) ||
1184             __get_user(kurb->flags, &uurb->flags) ||
1185             __get_user(kurb->buffer_length, &uurb->buffer_length) ||
1186             __get_user(kurb->actual_length, &uurb->actual_length) ||
1187             __get_user(kurb->start_frame, &uurb->start_frame) ||
1188             __get_user(kurb->number_of_packets, &uurb->number_of_packets) ||
1189             __get_user(kurb->error_count, &uurb->error_count) ||
1190             __get_user(kurb->signr, &uurb->signr))
1191                 return -EFAULT;
1192
1193         if (__get_user(uptr, &uurb->buffer))
1194                 return -EFAULT;
1195         kurb->buffer = compat_ptr(uptr);
1196         if (__get_user(uptr, &uurb->buffer))
1197                 return -EFAULT;
1198         kurb->usercontext = compat_ptr(uptr);
1199
1200         return 0;
1201 }
1202
1203 static int proc_submiturb_compat(struct dev_state *ps, void __user *arg)
1204 {
1205         struct usbdevfs_urb uurb;
1206
1207         if (get_urb32(&uurb,(struct usbdevfs_urb32 *)arg))
1208                 return -EFAULT;
1209
1210         return proc_do_submiturb(ps, &uurb, ((struct usbdevfs_urb32 __user *)arg)->iso_frame_desc, arg);
1211 }
1212
1213 static int processcompl_compat(struct async *as, void __user * __user *arg)
1214 {
1215         struct urb *urb = as->urb;
1216         struct usbdevfs_urb32 __user *userurb = as->userurb;
1217         void __user *addr = as->userurb;
1218         unsigned int i;
1219
1220         if (as->userbuffer)
1221                 if (copy_to_user(as->userbuffer, urb->transfer_buffer, urb->transfer_buffer_length))
1222                         return -EFAULT;
1223         if (put_user(urb->status, &userurb->status))
1224                 return -EFAULT;
1225         if (put_user(urb->actual_length, &userurb->actual_length))
1226                 return -EFAULT;
1227         if (put_user(urb->error_count, &userurb->error_count))
1228                 return -EFAULT;
1229
1230         if (usb_pipeisoc(urb->pipe)) {
1231                 for (i = 0; i < urb->number_of_packets; i++) {
1232                         if (put_user(urb->iso_frame_desc[i].actual_length,
1233                                      &userurb->iso_frame_desc[i].actual_length))
1234                                 return -EFAULT;
1235                         if (put_user(urb->iso_frame_desc[i].status,
1236                                      &userurb->iso_frame_desc[i].status))
1237                                 return -EFAULT;
1238                 }
1239         }
1240
1241         free_async(as);
1242         if (put_user((u32)(u64)addr, (u32 __user *)arg))
1243                 return -EFAULT;
1244         return 0;
1245 }
1246
1247 static int proc_reapurb_compat(struct dev_state *ps, void __user *arg)
1248 {
1249         struct async *as = reap_as(ps);
1250         if (as)
1251                 return processcompl_compat(as, (void __user * __user *)arg);
1252         if (signal_pending(current))
1253                 return -EINTR;
1254         return -EIO;
1255 }
1256
1257 static int proc_reapurbnonblock_compat(struct dev_state *ps, void __user *arg)
1258 {
1259         struct async *as;
1260
1261         if (!(as = async_getcompleted(ps)))
1262                 return -EAGAIN;
1263         return processcompl_compat(as, (void __user * __user *)arg);
1264 }
1265
1266 #endif
1267
1268 static int proc_disconnectsignal(struct dev_state *ps, void __user *arg)
1269 {
1270         struct usbdevfs_disconnectsignal ds;
1271
1272         if (copy_from_user(&ds, arg, sizeof(ds)))
1273                 return -EFAULT;
1274         if (ds.signr != 0 && (ds.signr < SIGRTMIN || ds.signr > SIGRTMAX))
1275                 return -EINVAL;
1276         ps->discsignr = ds.signr;
1277         ps->disccontext = ds.context;
1278         return 0;
1279 }
1280
1281 static int proc_claiminterface(struct dev_state *ps, void __user *arg)
1282 {
1283         unsigned int ifnum;
1284
1285         if (get_user(ifnum, (unsigned int __user *)arg))
1286                 return -EFAULT;
1287         return claimintf(ps, ifnum);
1288 }
1289
1290 static int proc_releaseinterface(struct dev_state *ps, void __user *arg)
1291 {
1292         unsigned int ifnum;
1293         int ret;
1294
1295         if (get_user(ifnum, (unsigned int __user *)arg))
1296                 return -EFAULT;
1297         if ((ret = releaseintf(ps, ifnum)) < 0)
1298                 return ret;
1299         destroy_async_on_interface (ps, ifnum);
1300         return 0;
1301 }
1302
1303 static int proc_ioctl(struct dev_state *ps, struct usbdevfs_ioctl *ctl)
1304 {
1305         int                     size;
1306         void                    *buf = NULL;
1307         int                     retval = 0;
1308         struct usb_interface    *intf = NULL;
1309         struct usb_driver       *driver = NULL;
1310
1311         /* alloc buffer */
1312         if ((size = _IOC_SIZE (ctl->ioctl_code)) > 0) {
1313                 if ((buf = kmalloc (size, GFP_KERNEL)) == NULL)
1314                         return -ENOMEM;
1315                 if ((_IOC_DIR(ctl->ioctl_code) & _IOC_WRITE)) {
1316                         if (copy_from_user (buf, ctl->data, size)) {
1317                                 kfree(buf);
1318                                 return -EFAULT;
1319                         }
1320                 } else {
1321                         memset (buf, 0, size);
1322                 }
1323         }
1324
1325         if (!connected(ps->dev)) {
1326                 kfree(buf);
1327                 return -ENODEV;
1328         }
1329
1330         if (ps->dev->state != USB_STATE_CONFIGURED)
1331                 retval = -EHOSTUNREACH;
1332         else if (!(intf = usb_ifnum_to_if (ps->dev, ctl->ifno)))
1333                retval = -EINVAL;
1334         else switch (ctl->ioctl_code) {
1335
1336         /* disconnect kernel driver from interface */
1337         case USBDEVFS_DISCONNECT:
1338
1339                 down_write(&usb_bus_type.subsys.rwsem);
1340                 if (intf->dev.driver) {
1341                         driver = to_usb_driver(intf->dev.driver);
1342                         dev_dbg (&intf->dev, "disconnect by usbfs\n");
1343                         usb_driver_release_interface(driver, intf);
1344                 } else
1345                         retval = -ENODATA;
1346                 up_write(&usb_bus_type.subsys.rwsem);
1347                 break;
1348
1349         /* let kernel drivers try to (re)bind to the interface */
1350         case USBDEVFS_CONNECT:
1351                 usb_unlock_device(ps->dev);
1352                 bus_rescan_devices(intf->dev.bus);
1353                 usb_lock_device(ps->dev);
1354                 break;
1355
1356         /* talk directly to the interface's driver */
1357         default:
1358                 down_read(&usb_bus_type.subsys.rwsem);
1359                 if (intf->dev.driver)
1360                         driver = to_usb_driver(intf->dev.driver);
1361                 if (driver == NULL || driver->ioctl == NULL) {
1362                         retval = -ENOTTY;
1363                 } else {
1364                         retval = driver->ioctl (intf, ctl->ioctl_code, buf);
1365                         if (retval == -ENOIOCTLCMD)
1366                                 retval = -ENOTTY;
1367                 }
1368                 up_read(&usb_bus_type.subsys.rwsem);
1369         }
1370
1371         /* cleanup and return */
1372         if (retval >= 0
1373                         && (_IOC_DIR (ctl->ioctl_code) & _IOC_READ) != 0
1374                         && size > 0
1375                         && copy_to_user (ctl->data, buf, size) != 0)
1376                 retval = -EFAULT;
1377
1378         kfree(buf);
1379         return retval;
1380 }
1381
1382 static int proc_ioctl_default(struct dev_state *ps, void __user *arg)
1383 {
1384         struct usbdevfs_ioctl   ctrl;
1385
1386         if (copy_from_user(&ctrl, arg, sizeof (ctrl)))
1387                 return -EFAULT;
1388         return proc_ioctl(ps, &ctrl);
1389 }
1390
1391 #ifdef CONFIG_COMPAT
1392 static int proc_ioctl_compat(struct dev_state *ps, compat_uptr_t arg)
1393 {
1394         struct usbdevfs_ioctl32 __user *uioc;
1395         struct usbdevfs_ioctl ctrl;
1396         u32 udata;
1397
1398         uioc = compat_ptr((long)arg);
1399         if (get_user(ctrl.ifno, &uioc->ifno) ||
1400             get_user(ctrl.ioctl_code, &uioc->ioctl_code) ||
1401             __get_user(udata, &uioc->data))
1402                 return -EFAULT;
1403         ctrl.data = compat_ptr(udata);
1404
1405         return proc_ioctl(ps, &ctrl);
1406 }
1407 #endif
1408
1409 /*
1410  * NOTE:  All requests here that have interface numbers as parameters
1411  * are assuming that somehow the configuration has been prevented from
1412  * changing.  But there's no mechanism to ensure that...
1413  */
1414 static int usbdev_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
1415 {
1416         struct dev_state *ps = (struct dev_state *)file->private_data;
1417         struct usb_device *dev = ps->dev;
1418         void __user *p = (void __user *)arg;
1419         int ret = -ENOTTY;
1420
1421         if (!(file->f_mode & FMODE_WRITE))
1422                 return -EPERM;
1423         usb_lock_device(dev);
1424         if (!connected(dev)) {
1425                 usb_unlock_device(dev);
1426                 return -ENODEV;
1427         }
1428
1429         switch (cmd) {
1430         case USBDEVFS_CONTROL:
1431                 snoop(&dev->dev, "%s: CONTROL\n", __FUNCTION__);
1432                 ret = proc_control(ps, p);
1433                 if (ret >= 0)
1434                         inode->i_mtime = CURRENT_TIME;
1435                 break;
1436
1437         case USBDEVFS_BULK:
1438                 snoop(&dev->dev, "%s: BULK\n", __FUNCTION__);
1439                 ret = proc_bulk(ps, p);
1440                 if (ret >= 0)
1441                         inode->i_mtime = CURRENT_TIME;
1442                 break;
1443
1444         case USBDEVFS_RESETEP:
1445                 snoop(&dev->dev, "%s: RESETEP\n", __FUNCTION__);
1446                 ret = proc_resetep(ps, p);
1447                 if (ret >= 0)
1448                         inode->i_mtime = CURRENT_TIME;
1449                 break;
1450
1451         case USBDEVFS_RESET:
1452                 snoop(&dev->dev, "%s: RESET\n", __FUNCTION__);
1453                 ret = proc_resetdevice(ps);
1454                 break;
1455
1456         case USBDEVFS_CLEAR_HALT:
1457                 snoop(&dev->dev, "%s: CLEAR_HALT\n", __FUNCTION__);
1458                 ret = proc_clearhalt(ps, p);
1459                 if (ret >= 0)
1460                         inode->i_mtime = CURRENT_TIME;
1461                 break;
1462
1463         case USBDEVFS_GETDRIVER:
1464                 snoop(&dev->dev, "%s: GETDRIVER\n", __FUNCTION__);
1465                 ret = proc_getdriver(ps, p);
1466                 break;
1467
1468         case USBDEVFS_CONNECTINFO:
1469                 snoop(&dev->dev, "%s: CONNECTINFO\n", __FUNCTION__);
1470                 ret = proc_connectinfo(ps, p);
1471                 break;
1472
1473         case USBDEVFS_SETINTERFACE:
1474                 snoop(&dev->dev, "%s: SETINTERFACE\n", __FUNCTION__);
1475                 ret = proc_setintf(ps, p);
1476                 break;
1477
1478         case USBDEVFS_SETCONFIGURATION:
1479                 snoop(&dev->dev, "%s: SETCONFIGURATION\n", __FUNCTION__);
1480                 ret = proc_setconfig(ps, p);
1481                 break;
1482
1483         case USBDEVFS_SUBMITURB:
1484                 snoop(&dev->dev, "%s: SUBMITURB\n", __FUNCTION__);
1485                 ret = proc_submiturb(ps, p);
1486                 if (ret >= 0)
1487                         inode->i_mtime = CURRENT_TIME;
1488                 break;
1489
1490 #ifdef CONFIG_COMPAT
1491
1492         case USBDEVFS_SUBMITURB32:
1493                 snoop(&dev->dev, "%s: SUBMITURB32\n", __FUNCTION__);
1494                 ret = proc_submiturb_compat(ps, p);
1495                 if (ret >= 0)
1496                         inode->i_mtime = CURRENT_TIME;
1497                 break;
1498
1499         case USBDEVFS_REAPURB32:
1500                 snoop(&dev->dev, "%s: REAPURB32\n", __FUNCTION__);
1501                 ret = proc_reapurb_compat(ps, p);
1502                 break;
1503
1504         case USBDEVFS_REAPURBNDELAY32:
1505                 snoop(&dev->dev, "%s: REAPURBDELAY32\n", __FUNCTION__);
1506                 ret = proc_reapurbnonblock_compat(ps, p);
1507                 break;
1508
1509         case USBDEVFS_IOCTL32:
1510                 snoop(&dev->dev, "%s: IOCTL\n", __FUNCTION__);
1511                 ret = proc_ioctl_compat(ps, (compat_uptr_t)(long)p);
1512                 break;
1513 #endif
1514
1515         case USBDEVFS_DISCARDURB:
1516                 snoop(&dev->dev, "%s: DISCARDURB\n", __FUNCTION__);
1517                 ret = proc_unlinkurb(ps, p);
1518                 break;
1519
1520         case USBDEVFS_REAPURB:
1521                 snoop(&dev->dev, "%s: REAPURB\n", __FUNCTION__);
1522                 ret = proc_reapurb(ps, p);
1523                 break;
1524
1525         case USBDEVFS_REAPURBNDELAY:
1526                 snoop(&dev->dev, "%s: REAPURBDELAY\n", __FUNCTION__);
1527                 ret = proc_reapurbnonblock(ps, p);
1528                 break;
1529
1530         case USBDEVFS_DISCSIGNAL:
1531                 snoop(&dev->dev, "%s: DISCSIGNAL\n", __FUNCTION__);
1532                 ret = proc_disconnectsignal(ps, p);
1533                 break;
1534
1535         case USBDEVFS_CLAIMINTERFACE:
1536                 snoop(&dev->dev, "%s: CLAIMINTERFACE\n", __FUNCTION__);
1537                 ret = proc_claiminterface(ps, p);
1538                 break;
1539
1540         case USBDEVFS_RELEASEINTERFACE:
1541                 snoop(&dev->dev, "%s: RELEASEINTERFACE\n", __FUNCTION__);
1542                 ret = proc_releaseinterface(ps, p);
1543                 break;
1544
1545         case USBDEVFS_IOCTL:
1546                 snoop(&dev->dev, "%s: IOCTL\n", __FUNCTION__);
1547                 ret = proc_ioctl_default(ps, p);
1548                 break;
1549         }
1550         usb_unlock_device(dev);
1551         if (ret >= 0)
1552                 inode->i_atime = CURRENT_TIME;
1553         return ret;
1554 }
1555
1556 /* No kernel lock - fine */
1557 static unsigned int usbdev_poll(struct file *file, struct poll_table_struct *wait)
1558 {
1559         struct dev_state *ps = (struct dev_state *)file->private_data;
1560         unsigned int mask = 0;
1561
1562         poll_wait(file, &ps->wait, wait);
1563         if (file->f_mode & FMODE_WRITE && !list_empty(&ps->async_completed))
1564                 mask |= POLLOUT | POLLWRNORM;
1565         if (!connected(ps->dev))
1566                 mask |= POLLERR | POLLHUP;
1567         return mask;
1568 }
1569
1570 struct file_operations usbfs_device_file_operations = {
1571         .llseek =       usbdev_lseek,
1572         .read =         usbdev_read,
1573         .poll =         usbdev_poll,
1574         .ioctl =        usbdev_ioctl,
1575         .open =         usbdev_open,
1576         .release =      usbdev_release,
1577 };
1578
1579 static void usbdev_add(struct usb_device *dev)
1580 {
1581         int minor = ((dev->bus->busnum-1) * 128) + (dev->devnum-1);
1582
1583         dev->class_dev = class_device_create(usb_device_class, NULL,
1584                                 MKDEV(USB_DEVICE_MAJOR, minor), &dev->dev,
1585                                 "usbdev%d.%d", dev->bus->busnum, dev->devnum);
1586
1587         dev->class_dev->class_data = dev;
1588 }
1589
1590 static void usbdev_remove(struct usb_device *dev)
1591 {
1592         class_device_unregister(dev->class_dev);
1593 }
1594
1595 static int usbdev_notify(struct notifier_block *self, unsigned long action,
1596                          void *dev)
1597 {
1598         switch (action) {
1599         case USB_DEVICE_ADD:
1600                 usbdev_add(dev);
1601                 break;
1602         case USB_DEVICE_REMOVE:
1603                 usbdev_remove(dev);
1604                 break;
1605         }
1606         return NOTIFY_OK;
1607 }
1608
1609 static struct notifier_block usbdev_nb = {
1610         .notifier_call =        usbdev_notify,
1611 };
1612
1613 static struct cdev usb_device_cdev = {
1614         .kobj   = {.name = "usb_device", },
1615         .owner  = THIS_MODULE,
1616 };
1617
1618 int __init usbdev_init(void)
1619 {
1620         int retval;
1621
1622         retval = register_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX,
1623                         "usb_device");
1624         if (retval) {
1625                 err("unable to register minors for usb_device");
1626                 goto out;
1627         }
1628         cdev_init(&usb_device_cdev, &usbfs_device_file_operations);
1629         retval = cdev_add(&usb_device_cdev, USB_DEVICE_DEV, USB_DEVICE_MAX);
1630         if (retval) {
1631                 err("unable to get usb_device major %d", USB_DEVICE_MAJOR);
1632                 goto error_cdev;
1633         }
1634         usb_device_class = class_create(THIS_MODULE, "usb_device");
1635         if (IS_ERR(usb_device_class)) {
1636                 err("unable to register usb_device class");
1637                 retval = PTR_ERR(usb_device_class);
1638                 goto error_class;
1639         }
1640
1641         usb_register_notify(&usbdev_nb);
1642
1643 out:
1644         return retval;
1645
1646 error_class:
1647         usb_device_class = NULL;
1648         cdev_del(&usb_device_cdev);
1649
1650 error_cdev:
1651         unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
1652         goto out;
1653 }
1654
1655 void usbdev_cleanup(void)
1656 {
1657         usb_unregister_notify(&usbdev_nb);
1658         class_destroy(usb_device_class);
1659         cdev_del(&usb_device_cdev);
1660         unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
1661 }
1662