d8b0476237f3cfe056256a23ee4abcfd495d98ca
[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 /* Mutual exclusion for removal, open, and release */
63 DEFINE_MUTEX(usbfs_mutex);
64
65 struct async {
66         struct list_head asynclist;
67         struct dev_state *ps;
68         pid_t pid;
69         uid_t uid, euid;
70         unsigned int signr;
71         unsigned int ifnum;
72         void __user *userbuffer;
73         void __user *userurb;
74         struct urb *urb;
75         u32 secid;
76 };
77
78 static int usbfs_snoop = 0;
79 module_param (usbfs_snoop, bool, S_IRUGO | S_IWUSR);
80 MODULE_PARM_DESC (usbfs_snoop, "true to log all usbfs traffic");
81
82 #define snoop(dev, format, arg...)                              \
83         do {                                                    \
84                 if (usbfs_snoop)                                \
85                         dev_info( dev , format , ## arg);       \
86         } while (0)
87
88 #define USB_DEVICE_DEV          MKDEV(USB_DEVICE_MAJOR, 0)
89
90
91 #define MAX_USBFS_BUFFER_SIZE   16384
92
93 static inline int connected (struct usb_device *dev)
94 {
95         return dev->state != USB_STATE_NOTATTACHED;
96 }
97
98 static loff_t usbdev_lseek(struct file *file, loff_t offset, int orig)
99 {
100         loff_t ret;
101
102         lock_kernel();
103
104         switch (orig) {
105         case 0:
106                 file->f_pos = offset;
107                 ret = file->f_pos;
108                 break;
109         case 1:
110                 file->f_pos += offset;
111                 ret = file->f_pos;
112                 break;
113         case 2:
114         default:
115                 ret = -EINVAL;
116         }
117
118         unlock_kernel();
119         return ret;
120 }
121
122 static ssize_t usbdev_read(struct file *file, char __user *buf, size_t nbytes, loff_t *ppos)
123 {
124         struct dev_state *ps = (struct dev_state *)file->private_data;
125         struct usb_device *dev = ps->dev;
126         ssize_t ret = 0;
127         unsigned len;
128         loff_t pos;
129         int i;
130
131         pos = *ppos;
132         usb_lock_device(dev);
133         if (!connected(dev)) {
134                 ret = -ENODEV;
135                 goto err;
136         } else if (pos < 0) {
137                 ret = -EINVAL;
138                 goto err;
139         }
140
141         if (pos < sizeof(struct usb_device_descriptor)) {
142                 struct usb_device_descriptor temp_desc ; /* 18 bytes - fits on the stack */
143
144                 memcpy(&temp_desc, &dev->descriptor, sizeof(dev->descriptor));
145                 le16_to_cpus(&temp_desc.bcdUSB);
146                 le16_to_cpus(&temp_desc.idVendor);
147                 le16_to_cpus(&temp_desc.idProduct);
148                 le16_to_cpus(&temp_desc.bcdDevice);
149
150                 len = sizeof(struct usb_device_descriptor) - pos;
151                 if (len > nbytes)
152                         len = nbytes;
153                 if (copy_to_user(buf, ((char *)&temp_desc) + pos, len)) {
154                         ret = -EFAULT;
155                         goto err;
156                 }
157
158                 *ppos += len;
159                 buf += len;
160                 nbytes -= len;
161                 ret += len;
162         }
163
164         pos = sizeof(struct usb_device_descriptor);
165         for (i = 0; nbytes && i < dev->descriptor.bNumConfigurations; i++) {
166                 struct usb_config_descriptor *config =
167                         (struct usb_config_descriptor *)dev->rawdescriptors[i];
168                 unsigned int length = le16_to_cpu(config->wTotalLength);
169
170                 if (*ppos < pos + length) {
171
172                         /* The descriptor may claim to be longer than it
173                          * really is.  Here is the actual allocated length. */
174                         unsigned alloclen =
175                                 le16_to_cpu(dev->config[i].desc.wTotalLength);
176
177                         len = length - (*ppos - pos);
178                         if (len > nbytes)
179                                 len = nbytes;
180
181                         /* Simply don't write (skip over) unallocated parts */
182                         if (alloclen > (*ppos - pos)) {
183                                 alloclen -= (*ppos - pos);
184                                 if (copy_to_user(buf,
185                                     dev->rawdescriptors[i] + (*ppos - pos),
186                                     min(len, alloclen))) {
187                                         ret = -EFAULT;
188                                         goto err;
189                                 }
190                         }
191
192                         *ppos += len;
193                         buf += len;
194                         nbytes -= len;
195                         ret += len;
196                 }
197
198                 pos += length;
199         }
200
201 err:
202         usb_unlock_device(dev);
203         return ret;
204 }
205
206 /*
207  * async list handling
208  */
209
210 static struct async *alloc_async(unsigned int numisoframes)
211 {
212         unsigned int assize = sizeof(struct async) + numisoframes * sizeof(struct usb_iso_packet_descriptor);
213         struct async *as = kzalloc(assize, GFP_KERNEL);
214
215         if (!as)
216                 return NULL;
217         as->urb = usb_alloc_urb(numisoframes, GFP_KERNEL);
218         if (!as->urb) {
219                 kfree(as);
220                 return NULL;
221         }
222         return as;
223 }
224
225 static void free_async(struct async *as)
226 {
227         kfree(as->urb->transfer_buffer);
228         kfree(as->urb->setup_packet);
229         usb_free_urb(as->urb);
230         kfree(as);
231 }
232
233 static inline void async_newpending(struct async *as)
234 {
235         struct dev_state *ps = as->ps;
236         unsigned long flags;
237         
238         spin_lock_irqsave(&ps->lock, flags);
239         list_add_tail(&as->asynclist, &ps->async_pending);
240         spin_unlock_irqrestore(&ps->lock, flags);
241 }
242
243 static inline void async_removepending(struct async *as)
244 {
245         struct dev_state *ps = as->ps;
246         unsigned long flags;
247         
248         spin_lock_irqsave(&ps->lock, flags);
249         list_del_init(&as->asynclist);
250         spin_unlock_irqrestore(&ps->lock, flags);
251 }
252
253 static inline struct async *async_getcompleted(struct dev_state *ps)
254 {
255         unsigned long flags;
256         struct async *as = NULL;
257
258         spin_lock_irqsave(&ps->lock, flags);
259         if (!list_empty(&ps->async_completed)) {
260                 as = list_entry(ps->async_completed.next, struct async, asynclist);
261                 list_del_init(&as->asynclist);
262         }
263         spin_unlock_irqrestore(&ps->lock, flags);
264         return as;
265 }
266
267 static inline struct async *async_getpending(struct dev_state *ps, void __user *userurb)
268 {
269         unsigned long flags;
270         struct async *as;
271
272         spin_lock_irqsave(&ps->lock, flags);
273         list_for_each_entry(as, &ps->async_pending, asynclist)
274                 if (as->userurb == userurb) {
275                         list_del_init(&as->asynclist);
276                         spin_unlock_irqrestore(&ps->lock, flags);
277                         return as;
278                 }
279         spin_unlock_irqrestore(&ps->lock, flags);
280         return NULL;
281 }
282
283 static void snoop_urb(struct urb *urb, void __user *userurb)
284 {
285         int j;
286         unsigned char *data = urb->transfer_buffer;
287
288         if (!usbfs_snoop)
289                 return;
290
291         if (urb->pipe & USB_DIR_IN)
292                 dev_info(&urb->dev->dev, "direction=IN\n");
293         else
294                 dev_info(&urb->dev->dev, "direction=OUT\n");
295         dev_info(&urb->dev->dev, "userurb=%p\n", userurb);
296         dev_info(&urb->dev->dev, "transfer_buffer_length=%d\n",
297                  urb->transfer_buffer_length);
298         dev_info(&urb->dev->dev, "actual_length=%d\n", urb->actual_length);
299         dev_info(&urb->dev->dev, "data: ");
300         for (j = 0; j < urb->transfer_buffer_length; ++j)
301                 printk ("%02x ", data[j]);
302         printk("\n");
303 }
304
305 static void async_completed(struct urb *urb, struct pt_regs *regs)
306 {
307         struct async *as = (struct async *)urb->context;
308         struct dev_state *ps = as->ps;
309         struct siginfo sinfo;
310
311         spin_lock(&ps->lock);
312         list_move_tail(&as->asynclist, &ps->async_completed);
313         spin_unlock(&ps->lock);
314         if (as->signr) {
315                 sinfo.si_signo = as->signr;
316                 sinfo.si_errno = as->urb->status;
317                 sinfo.si_code = SI_ASYNCIO;
318                 sinfo.si_addr = as->userurb;
319                 kill_proc_info_as_uid(as->signr, &sinfo, as->pid, as->uid, 
320                                       as->euid, as->secid);
321         }
322         snoop(&urb->dev->dev, "urb complete\n");
323         snoop_urb(urb, as->userurb);
324         wake_up(&ps->wait);
325 }
326
327 static void destroy_async (struct dev_state *ps, struct list_head *list)
328 {
329         struct async *as;
330         unsigned long flags;
331
332         spin_lock_irqsave(&ps->lock, flags);
333         while (!list_empty(list)) {
334                 as = list_entry(list->next, struct async, asynclist);
335                 list_del_init(&as->asynclist);
336
337                 /* drop the spinlock so the completion handler can run */
338                 spin_unlock_irqrestore(&ps->lock, flags);
339                 usb_kill_urb(as->urb);
340                 spin_lock_irqsave(&ps->lock, flags);
341         }
342         spin_unlock_irqrestore(&ps->lock, flags);
343         as = async_getcompleted(ps);
344         while (as) {
345                 free_async(as);
346                 as = async_getcompleted(ps);
347         }
348 }
349
350 static void destroy_async_on_interface (struct dev_state *ps, unsigned int ifnum)
351 {
352         struct list_head *p, *q, hitlist;
353         unsigned long flags;
354
355         INIT_LIST_HEAD(&hitlist);
356         spin_lock_irqsave(&ps->lock, flags);
357         list_for_each_safe(p, q, &ps->async_pending)
358                 if (ifnum == list_entry(p, struct async, asynclist)->ifnum)
359                         list_move_tail(p, &hitlist);
360         spin_unlock_irqrestore(&ps->lock, flags);
361         destroy_async(ps, &hitlist);
362 }
363
364 static inline void destroy_all_async(struct dev_state *ps)
365 {
366                 destroy_async(ps, &ps->async_pending);
367 }
368
369 /*
370  * interface claims are made only at the request of user level code,
371  * which can also release them (explicitly or by closing files).
372  * they're also undone when devices disconnect.
373  */
374
375 static int driver_probe (struct usb_interface *intf,
376                          const struct usb_device_id *id)
377 {
378         return -ENODEV;
379 }
380
381 static void driver_disconnect(struct usb_interface *intf)
382 {
383         struct dev_state *ps = usb_get_intfdata (intf);
384         unsigned int ifnum = intf->altsetting->desc.bInterfaceNumber;
385
386         if (!ps)
387                 return;
388
389         /* NOTE:  this relies on usbcore having canceled and completed
390          * all pending I/O requests; 2.6 does that.
391          */
392
393         if (likely(ifnum < 8*sizeof(ps->ifclaimed)))
394                 clear_bit(ifnum, &ps->ifclaimed);
395         else
396                 warn("interface number %u out of range", ifnum);
397
398         usb_set_intfdata (intf, NULL);
399
400         /* force async requests to complete */
401         destroy_async_on_interface(ps, ifnum);
402 }
403
404 struct usb_driver usbfs_driver = {
405         .name =         "usbfs",
406         .probe =        driver_probe,
407         .disconnect =   driver_disconnect,
408 };
409
410 static int claimintf(struct dev_state *ps, unsigned int ifnum)
411 {
412         struct usb_device *dev = ps->dev;
413         struct usb_interface *intf;
414         int err;
415
416         if (ifnum >= 8*sizeof(ps->ifclaimed))
417                 return -EINVAL;
418         /* already claimed */
419         if (test_bit(ifnum, &ps->ifclaimed))
420                 return 0;
421
422         /* lock against other changes to driver bindings */
423         down_write(&usb_bus_type.subsys.rwsem);
424         intf = usb_ifnum_to_if(dev, ifnum);
425         if (!intf)
426                 err = -ENOENT;
427         else
428                 err = usb_driver_claim_interface(&usbfs_driver, intf, ps);
429         up_write(&usb_bus_type.subsys.rwsem);
430         if (err == 0)
431                 set_bit(ifnum, &ps->ifclaimed);
432         return err;
433 }
434
435 static int releaseintf(struct dev_state *ps, unsigned int ifnum)
436 {
437         struct usb_device *dev;
438         struct usb_interface *intf;
439         int err;
440
441         err = -EINVAL;
442         if (ifnum >= 8*sizeof(ps->ifclaimed))
443                 return err;
444         dev = ps->dev;
445         /* lock against other changes to driver bindings */
446         down_write(&usb_bus_type.subsys.rwsem);
447         intf = usb_ifnum_to_if(dev, ifnum);
448         if (!intf)
449                 err = -ENOENT;
450         else if (test_and_clear_bit(ifnum, &ps->ifclaimed)) {
451                 usb_driver_release_interface(&usbfs_driver, intf);
452                 err = 0;
453         }
454         up_write(&usb_bus_type.subsys.rwsem);
455         return err;
456 }
457
458 static int checkintf(struct dev_state *ps, unsigned int ifnum)
459 {
460         if (ps->dev->state != USB_STATE_CONFIGURED)
461                 return -EHOSTUNREACH;
462         if (ifnum >= 8*sizeof(ps->ifclaimed))
463                 return -EINVAL;
464         if (test_bit(ifnum, &ps->ifclaimed))
465                 return 0;
466         /* if not yet claimed, claim it for the driver */
467         dev_warn(&ps->dev->dev, "usbfs: process %d (%s) did not claim interface %u before use\n",
468                current->pid, current->comm, ifnum);
469         return claimintf(ps, ifnum);
470 }
471
472 static int findintfep(struct usb_device *dev, unsigned int ep)
473 {
474         unsigned int i, j, e;
475         struct usb_interface *intf;
476         struct usb_host_interface *alts;
477         struct usb_endpoint_descriptor *endpt;
478
479         if (ep & ~(USB_DIR_IN|0xf))
480                 return -EINVAL;
481         if (!dev->actconfig)
482                 return -ESRCH;
483         for (i = 0; i < dev->actconfig->desc.bNumInterfaces; i++) {
484                 intf = dev->actconfig->interface[i];
485                 for (j = 0; j < intf->num_altsetting; j++) {
486                         alts = &intf->altsetting[j];
487                         for (e = 0; e < alts->desc.bNumEndpoints; e++) {
488                                 endpt = &alts->endpoint[e].desc;
489                                 if (endpt->bEndpointAddress == ep)
490                                         return alts->desc.bInterfaceNumber;
491                         }
492                 }
493         }
494         return -ENOENT; 
495 }
496
497 static int check_ctrlrecip(struct dev_state *ps, unsigned int requesttype, unsigned int index)
498 {
499         int ret = 0;
500
501         if (ps->dev->state != USB_STATE_ADDRESS
502          && ps->dev->state != USB_STATE_CONFIGURED)
503                 return -EHOSTUNREACH;
504         if (USB_TYPE_VENDOR == (USB_TYPE_MASK & requesttype))
505                 return 0;
506
507         index &= 0xff;
508         switch (requesttype & USB_RECIP_MASK) {
509         case USB_RECIP_ENDPOINT:
510                 if ((ret = findintfep(ps->dev, index)) >= 0)
511                         ret = checkintf(ps, ret);
512                 break;
513
514         case USB_RECIP_INTERFACE:
515                 ret = checkintf(ps, index);
516                 break;
517         }
518         return ret;
519 }
520
521 static struct usb_device *usbdev_lookup_minor(int minor)
522 {
523         struct class_device *class_dev;
524         struct usb_device *dev = NULL;
525
526         down(&usb_device_class->sem);
527         list_for_each_entry(class_dev, &usb_device_class->children, node) {
528                 if (class_dev->devt == MKDEV(USB_DEVICE_MAJOR, minor)) {
529                         dev = class_dev->class_data;
530                         break;
531                 }
532         }
533         up(&usb_device_class->sem);
534
535         return dev;
536 };
537
538 /*
539  * file operations
540  */
541 static int usbdev_open(struct inode *inode, struct file *file)
542 {
543         struct usb_device *dev = NULL;
544         struct dev_state *ps;
545         int ret;
546
547         /* Protect against simultaneous removal or release */
548         mutex_lock(&usbfs_mutex);
549
550         ret = -ENOMEM;
551         if (!(ps = kmalloc(sizeof(struct dev_state), GFP_KERNEL)))
552                 goto out;
553
554         ret = -ENOENT;
555         /* check if we are called from a real node or usbfs */
556         if (imajor(inode) == USB_DEVICE_MAJOR)
557                 dev = usbdev_lookup_minor(iminor(inode));
558         if (!dev)
559                 dev = inode->i_private;
560         if (!dev) {
561                 kfree(ps);
562                 goto out;
563         }
564         usb_get_dev(dev);
565         ret = 0;
566         ps->dev = dev;
567         ps->file = file;
568         spin_lock_init(&ps->lock);
569         INIT_LIST_HEAD(&ps->async_pending);
570         INIT_LIST_HEAD(&ps->async_completed);
571         init_waitqueue_head(&ps->wait);
572         ps->discsignr = 0;
573         ps->disc_pid = current->pid;
574         ps->disc_uid = current->uid;
575         ps->disc_euid = current->euid;
576         ps->disccontext = NULL;
577         ps->ifclaimed = 0;
578         security_task_getsecid(current, &ps->secid);
579         wmb();
580         list_add_tail(&ps->list, &dev->filelist);
581         file->private_data = ps;
582  out:
583         mutex_unlock(&usbfs_mutex);
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
595         /* Protect against simultaneous open */
596         mutex_lock(&usbfs_mutex);
597         list_del_init(&ps->list);
598         mutex_unlock(&usbfs_mutex);
599
600         for (ifnum = 0; ps->ifclaimed && ifnum < 8*sizeof(ps->ifclaimed);
601                         ifnum++) {
602                 if (test_bit(ifnum, &ps->ifclaimed))
603                         releaseintf(ps, ifnum);
604         }
605         destroy_all_async(ps);
606         usb_unlock_device(dev);
607         usb_put_dev(dev);
608         kfree(ps);
609         return 0;
610 }
611
612 static int proc_control(struct dev_state *ps, void __user *arg)
613 {
614         struct usb_device *dev = ps->dev;
615         struct usbdevfs_ctrltransfer ctrl;
616         unsigned int tmo;
617         unsigned char *tbuf;
618         int i, j, ret;
619
620         if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
621                 return -EFAULT;
622         if ((ret = check_ctrlrecip(ps, ctrl.bRequestType, ctrl.wIndex)))
623                 return ret;
624         if (ctrl.wLength > PAGE_SIZE)
625                 return -EINVAL;
626         if (!(tbuf = (unsigned char *)__get_free_page(GFP_KERNEL)))
627                 return -ENOMEM;
628         tmo = ctrl.timeout;
629         if (ctrl.bRequestType & 0x80) {
630                 if (ctrl.wLength && !access_ok(VERIFY_WRITE, ctrl.data, ctrl.wLength)) {
631                         free_page((unsigned long)tbuf);
632                         return -EINVAL;
633                 }
634                 snoop(&dev->dev, "control read: bRequest=%02x "
635                                 "bRrequestType=%02x wValue=%04x "
636                                 "wIndex=%04x wLength=%04x\n",
637                         ctrl.bRequest, ctrl.bRequestType, ctrl.wValue,
638                                 ctrl.wIndex, ctrl.wLength);
639
640                 usb_unlock_device(dev);
641                 i = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), ctrl.bRequest, ctrl.bRequestType,
642                                        ctrl.wValue, ctrl.wIndex, tbuf, ctrl.wLength, tmo);
643                 usb_lock_device(dev);
644                 if ((i > 0) && ctrl.wLength) {
645                         if (usbfs_snoop) {
646                                 dev_info(&dev->dev, "control read: data ");
647                                 for (j = 0; j < i; ++j)
648                                         printk("%02x ", (unsigned char)(tbuf)[j]);
649                                 printk("\n");
650                         }
651                         if (copy_to_user(ctrl.data, tbuf, i)) {
652                                 free_page((unsigned long)tbuf);
653                                 return -EFAULT;
654                         }
655                 }
656         } else {
657                 if (ctrl.wLength) {
658                         if (copy_from_user(tbuf, ctrl.data, ctrl.wLength)) {
659                                 free_page((unsigned long)tbuf);
660                                 return -EFAULT;
661                         }
662                 }
663                 snoop(&dev->dev, "control write: bRequest=%02x "
664                                 "bRrequestType=%02x wValue=%04x "
665                                 "wIndex=%04x wLength=%04x\n",
666                         ctrl.bRequest, ctrl.bRequestType, ctrl.wValue,
667                                 ctrl.wIndex, ctrl.wLength);
668                 if (usbfs_snoop) {
669                         dev_info(&dev->dev, "control write: data: ");
670                         for (j = 0; j < ctrl.wLength; ++j)
671                                 printk("%02x ", (unsigned char)(tbuf)[j]);
672                         printk("\n");
673                 }
674                 usb_unlock_device(dev);
675                 i = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), ctrl.bRequest, ctrl.bRequestType,
676                                        ctrl.wValue, ctrl.wIndex, tbuf, ctrl.wLength, tmo);
677                 usb_lock_device(dev);
678         }
679         free_page((unsigned long)tbuf);
680         if (i<0 && i != -EPIPE) {
681                 dev_printk(KERN_DEBUG, &dev->dev, "usbfs: USBDEVFS_CONTROL "
682                            "failed cmd %s rqt %u rq %u len %u ret %d\n",
683                            current->comm, ctrl.bRequestType, ctrl.bRequest,
684                            ctrl.wLength, i);
685         }
686         return i;
687 }
688
689 static int proc_bulk(struct dev_state *ps, void __user *arg)
690 {
691         struct usb_device *dev = ps->dev;
692         struct usbdevfs_bulktransfer bulk;
693         unsigned int tmo, len1, pipe;
694         int len2;
695         unsigned char *tbuf;
696         int i, j, ret;
697
698         if (copy_from_user(&bulk, arg, sizeof(bulk)))
699                 return -EFAULT;
700         if ((ret = findintfep(ps->dev, bulk.ep)) < 0)
701                 return ret;
702         if ((ret = checkintf(ps, ret)))
703                 return ret;
704         if (bulk.ep & USB_DIR_IN)
705                 pipe = usb_rcvbulkpipe(dev, bulk.ep & 0x7f);
706         else
707                 pipe = usb_sndbulkpipe(dev, bulk.ep & 0x7f);
708         if (!usb_maxpacket(dev, pipe, !(bulk.ep & USB_DIR_IN)))
709                 return -EINVAL;
710         len1 = bulk.len;
711         if (len1 > MAX_USBFS_BUFFER_SIZE)
712                 return -EINVAL;
713         if (!(tbuf = kmalloc(len1, GFP_KERNEL)))
714                 return -ENOMEM;
715         tmo = bulk.timeout;
716         if (bulk.ep & 0x80) {
717                 if (len1 && !access_ok(VERIFY_WRITE, bulk.data, len1)) {
718                         kfree(tbuf);
719                         return -EINVAL;
720                 }
721                 snoop(&dev->dev, "bulk read: len=0x%02x timeout=%04d\n",
722                         bulk.len, bulk.timeout);
723                 usb_unlock_device(dev);
724                 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
725                 usb_lock_device(dev);
726                 if (!i && len2) {
727                         if (usbfs_snoop) {
728                                 dev_info(&dev->dev, "bulk read: data ");
729                                 for (j = 0; j < len2; ++j)
730                                         printk("%02x ", (unsigned char)(tbuf)[j]);
731                                 printk("\n");
732                         }
733                         if (copy_to_user(bulk.data, tbuf, len2)) {
734                                 kfree(tbuf);
735                                 return -EFAULT;
736                         }
737                 }
738         } else {
739                 if (len1) {
740                         if (copy_from_user(tbuf, bulk.data, len1)) {
741                                 kfree(tbuf);
742                                 return -EFAULT;
743                         }
744                 }
745                 snoop(&dev->dev, "bulk write: len=0x%02x timeout=%04d\n",
746                         bulk.len, bulk.timeout);
747                 if (usbfs_snoop) {
748                         dev_info(&dev->dev, "bulk write: data: ");
749                         for (j = 0; j < len1; ++j)
750                                 printk("%02x ", (unsigned char)(tbuf)[j]);
751                         printk("\n");
752                 }
753                 usb_unlock_device(dev);
754                 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
755                 usb_lock_device(dev);
756         }
757         kfree(tbuf);
758         if (i < 0)
759                 return i;
760         return len2;
761 }
762
763 static int proc_resetep(struct dev_state *ps, void __user *arg)
764 {
765         unsigned int ep;
766         int ret;
767
768         if (get_user(ep, (unsigned int __user *)arg))
769                 return -EFAULT;
770         if ((ret = findintfep(ps->dev, ep)) < 0)
771                 return ret;
772         if ((ret = checkintf(ps, ret)))
773                 return ret;
774         usb_settoggle(ps->dev, ep & 0xf, !(ep & USB_DIR_IN), 0);
775         return 0;
776 }
777
778 static int proc_clearhalt(struct dev_state *ps, void __user *arg)
779 {
780         unsigned int ep;
781         int pipe;
782         int ret;
783
784         if (get_user(ep, (unsigned int __user *)arg))
785                 return -EFAULT;
786         if ((ret = findintfep(ps->dev, ep)) < 0)
787                 return ret;
788         if ((ret = checkintf(ps, ret)))
789                 return ret;
790         if (ep & USB_DIR_IN)
791                 pipe = usb_rcvbulkpipe(ps->dev, ep & 0x7f);
792         else
793                 pipe = usb_sndbulkpipe(ps->dev, ep & 0x7f);
794
795         return usb_clear_halt(ps->dev, pipe);
796 }
797                 
798
799 static int proc_getdriver(struct dev_state *ps, void __user *arg)
800 {
801         struct usbdevfs_getdriver gd;
802         struct usb_interface *intf;
803         int ret;
804
805         if (copy_from_user(&gd, arg, sizeof(gd)))
806                 return -EFAULT;
807         down_read(&usb_bus_type.subsys.rwsem);
808         intf = usb_ifnum_to_if(ps->dev, gd.interface);
809         if (!intf || !intf->dev.driver)
810                 ret = -ENODATA;
811         else {
812                 strncpy(gd.driver, intf->dev.driver->name,
813                                 sizeof(gd.driver));
814                 ret = (copy_to_user(arg, &gd, sizeof(gd)) ? -EFAULT : 0);
815         }
816         up_read(&usb_bus_type.subsys.rwsem);
817         return ret;
818 }
819
820 static int proc_connectinfo(struct dev_state *ps, void __user *arg)
821 {
822         struct usbdevfs_connectinfo ci;
823
824         ci.devnum = ps->dev->devnum;
825         ci.slow = ps->dev->speed == USB_SPEED_LOW;
826         if (copy_to_user(arg, &ci, sizeof(ci)))
827                 return -EFAULT;
828         return 0;
829 }
830
831 static int proc_resetdevice(struct dev_state *ps)
832 {
833         return usb_reset_composite_device(ps->dev, NULL);
834 }
835
836 static int proc_setintf(struct dev_state *ps, void __user *arg)
837 {
838         struct usbdevfs_setinterface setintf;
839         int ret;
840
841         if (copy_from_user(&setintf, arg, sizeof(setintf)))
842                 return -EFAULT;
843         if ((ret = checkintf(ps, setintf.interface)))
844                 return ret;
845         return usb_set_interface(ps->dev, setintf.interface,
846                         setintf.altsetting);
847 }
848
849 static int proc_setconfig(struct dev_state *ps, void __user *arg)
850 {
851         unsigned int u;
852         int status = 0;
853         struct usb_host_config *actconfig;
854
855         if (get_user(u, (unsigned int __user *)arg))
856                 return -EFAULT;
857
858         actconfig = ps->dev->actconfig;
859  
860         /* Don't touch the device if any interfaces are claimed.
861          * It could interfere with other drivers' operations, and if
862          * an interface is claimed by usbfs it could easily deadlock.
863          */
864         if (actconfig) {
865                 int i;
866  
867                 for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) {
868                         if (usb_interface_claimed(actconfig->interface[i])) {
869                                 dev_warn (&ps->dev->dev,
870                                         "usbfs: interface %d claimed by %s "
871                                         "while '%s' sets config #%d\n",
872                                         actconfig->interface[i]
873                                                 ->cur_altsetting
874                                                 ->desc.bInterfaceNumber,
875                                         actconfig->interface[i]
876                                                 ->dev.driver->name,
877                                         current->comm, u);
878                                 status = -EBUSY;
879                                 break;
880                         }
881                 }
882         }
883
884         /* SET_CONFIGURATION is often abused as a "cheap" driver reset,
885          * so avoid usb_set_configuration()'s kick to sysfs
886          */
887         if (status == 0) {
888                 if (actconfig && actconfig->desc.bConfigurationValue == u)
889                         status = usb_reset_configuration(ps->dev);
890                 else
891                         status = usb_set_configuration(ps->dev, u);
892         }
893
894         return status;
895 }
896
897 static int proc_do_submiturb(struct dev_state *ps, struct usbdevfs_urb *uurb,
898                              struct usbdevfs_iso_packet_desc __user *iso_frame_desc,
899                              void __user *arg)
900 {
901         struct usbdevfs_iso_packet_desc *isopkt = NULL;
902         struct usb_host_endpoint *ep;
903         struct async *as;
904         struct usb_ctrlrequest *dr = NULL;
905         unsigned int u, totlen, isofrmlen;
906         int ret, interval = 0, ifnum = -1;
907
908         if (uurb->flags & ~(USBDEVFS_URB_ISO_ASAP|USBDEVFS_URB_SHORT_NOT_OK|
909                            URB_NO_FSBR|URB_ZERO_PACKET))
910                 return -EINVAL;
911         if (!uurb->buffer)
912                 return -EINVAL;
913         if (uurb->signr != 0 && (uurb->signr < SIGRTMIN || uurb->signr > SIGRTMAX))
914                 return -EINVAL;
915         if (!(uurb->type == USBDEVFS_URB_TYPE_CONTROL && (uurb->endpoint & ~USB_ENDPOINT_DIR_MASK) == 0)) {
916                 if ((ifnum = findintfep(ps->dev, uurb->endpoint)) < 0)
917                         return ifnum;
918                 if ((ret = checkintf(ps, ifnum)))
919                         return ret;
920         }
921         if ((uurb->endpoint & USB_ENDPOINT_DIR_MASK) != 0)
922                 ep = ps->dev->ep_in [uurb->endpoint & USB_ENDPOINT_NUMBER_MASK];
923         else
924                 ep = ps->dev->ep_out [uurb->endpoint & USB_ENDPOINT_NUMBER_MASK];
925         if (!ep)
926                 return -ENOENT;
927         switch(uurb->type) {
928         case USBDEVFS_URB_TYPE_CONTROL:
929                 if ((ep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
930                                 != USB_ENDPOINT_XFER_CONTROL)
931                         return -EINVAL;
932                 /* min 8 byte setup packet, max 8 byte setup plus an arbitrary data stage */
933                 if (uurb->buffer_length < 8 || uurb->buffer_length > (8 + MAX_USBFS_BUFFER_SIZE))
934                         return -EINVAL;
935                 if (!(dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL)))
936                         return -ENOMEM;
937                 if (copy_from_user(dr, uurb->buffer, 8)) {
938                         kfree(dr);
939                         return -EFAULT;
940                 }
941                 if (uurb->buffer_length < (le16_to_cpup(&dr->wLength) + 8)) {
942                         kfree(dr);
943                         return -EINVAL;
944                 }
945                 if ((ret = check_ctrlrecip(ps, dr->bRequestType, le16_to_cpup(&dr->wIndex)))) {
946                         kfree(dr);
947                         return ret;
948                 }
949                 uurb->endpoint = (uurb->endpoint & ~USB_ENDPOINT_DIR_MASK) | (dr->bRequestType & USB_ENDPOINT_DIR_MASK);
950                 uurb->number_of_packets = 0;
951                 uurb->buffer_length = le16_to_cpup(&dr->wLength);
952                 uurb->buffer += 8;
953                 if (!access_ok((uurb->endpoint & USB_DIR_IN) ?  VERIFY_WRITE : VERIFY_READ, uurb->buffer, uurb->buffer_length)) {
954                         kfree(dr);
955                         return -EFAULT;
956                 }
957                 snoop(&ps->dev->dev, "control urb\n");
958                 break;
959
960         case USBDEVFS_URB_TYPE_BULK:
961                 switch (ep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) {
962                 case USB_ENDPOINT_XFER_CONTROL:
963                 case USB_ENDPOINT_XFER_ISOC:
964                         return -EINVAL;
965                 /* allow single-shot interrupt transfers, at bogus rates */
966                 }
967                 uurb->number_of_packets = 0;
968                 if (uurb->buffer_length > MAX_USBFS_BUFFER_SIZE)
969                         return -EINVAL;
970                 if (!access_ok((uurb->endpoint & USB_DIR_IN) ? VERIFY_WRITE : VERIFY_READ, uurb->buffer, uurb->buffer_length))
971                         return -EFAULT;
972                 snoop(&ps->dev->dev, "bulk urb\n");
973                 break;
974
975         case USBDEVFS_URB_TYPE_ISO:
976                 /* arbitrary limit */
977                 if (uurb->number_of_packets < 1 || uurb->number_of_packets > 128)
978                         return -EINVAL;
979                 if ((ep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
980                                 != USB_ENDPOINT_XFER_ISOC)
981                         return -EINVAL;
982                 interval = 1 << min (15, ep->desc.bInterval - 1);
983                 isofrmlen = sizeof(struct usbdevfs_iso_packet_desc) * uurb->number_of_packets;
984                 if (!(isopkt = kmalloc(isofrmlen, GFP_KERNEL)))
985                         return -ENOMEM;
986                 if (copy_from_user(isopkt, iso_frame_desc, isofrmlen)) {
987                         kfree(isopkt);
988                         return -EFAULT;
989                 }
990                 for (totlen = u = 0; u < uurb->number_of_packets; u++) {
991                         /* arbitrary limit, sufficient for USB 2.0 high-bandwidth iso */
992                         if (isopkt[u].length > 8192) {
993                                 kfree(isopkt);
994                                 return -EINVAL;
995                         }
996                         totlen += isopkt[u].length;
997                 }
998                 if (totlen > 32768) {
999                         kfree(isopkt);
1000                         return -EINVAL;
1001                 }
1002                 uurb->buffer_length = totlen;
1003                 snoop(&ps->dev->dev, "iso urb\n");
1004                 break;
1005
1006         case USBDEVFS_URB_TYPE_INTERRUPT:
1007                 uurb->number_of_packets = 0;
1008                 if ((ep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
1009                                 != USB_ENDPOINT_XFER_INT)
1010                         return -EINVAL;
1011                 if (ps->dev->speed == USB_SPEED_HIGH)
1012                         interval = 1 << min (15, ep->desc.bInterval - 1);
1013                 else
1014                         interval = ep->desc.bInterval;
1015                 if (uurb->buffer_length > MAX_USBFS_BUFFER_SIZE)
1016                         return -EINVAL;
1017                 if (!access_ok((uurb->endpoint & USB_DIR_IN) ? VERIFY_WRITE : VERIFY_READ, uurb->buffer, uurb->buffer_length))
1018                         return -EFAULT;
1019                 snoop(&ps->dev->dev, "interrupt urb\n");
1020                 break;
1021
1022         default:
1023                 return -EINVAL;
1024         }
1025         if (!(as = alloc_async(uurb->number_of_packets))) {
1026                 kfree(isopkt);
1027                 kfree(dr);
1028                 return -ENOMEM;
1029         }
1030         if (!(as->urb->transfer_buffer = kmalloc(uurb->buffer_length, GFP_KERNEL))) {
1031                 kfree(isopkt);
1032                 kfree(dr);
1033                 free_async(as);
1034                 return -ENOMEM;
1035         }
1036         as->urb->dev = ps->dev;
1037         as->urb->pipe = (uurb->type << 30) | __create_pipe(ps->dev, uurb->endpoint & 0xf) | (uurb->endpoint & USB_DIR_IN);
1038         as->urb->transfer_flags = uurb->flags;
1039         as->urb->transfer_buffer_length = uurb->buffer_length;
1040         as->urb->setup_packet = (unsigned char*)dr;
1041         as->urb->start_frame = uurb->start_frame;
1042         as->urb->number_of_packets = uurb->number_of_packets;
1043         as->urb->interval = interval;
1044         as->urb->context = as;
1045         as->urb->complete = async_completed;
1046         for (totlen = u = 0; u < uurb->number_of_packets; u++) {
1047                 as->urb->iso_frame_desc[u].offset = totlen;
1048                 as->urb->iso_frame_desc[u].length = isopkt[u].length;
1049                 totlen += isopkt[u].length;
1050         }
1051         kfree(isopkt);
1052         as->ps = ps;
1053         as->userurb = arg;
1054         if (uurb->endpoint & USB_DIR_IN)
1055                 as->userbuffer = uurb->buffer;
1056         else
1057                 as->userbuffer = NULL;
1058         as->signr = uurb->signr;
1059         as->ifnum = ifnum;
1060         as->pid = current->pid;
1061         as->uid = current->uid;
1062         as->euid = current->euid;
1063         security_task_getsecid(current, &as->secid);
1064         if (!(uurb->endpoint & USB_DIR_IN)) {
1065                 if (copy_from_user(as->urb->transfer_buffer, uurb->buffer, as->urb->transfer_buffer_length)) {
1066                         free_async(as);
1067                         return -EFAULT;
1068                 }
1069         }
1070         snoop(&as->urb->dev->dev, "submit urb\n");
1071         snoop_urb(as->urb, as->userurb);
1072         async_newpending(as);
1073         if ((ret = usb_submit_urb(as->urb, GFP_KERNEL))) {
1074                 dev_printk(KERN_DEBUG, &ps->dev->dev, "usbfs: usb_submit_urb returned %d\n", ret);
1075                 async_removepending(as);
1076                 free_async(as);
1077                 return ret;
1078         }
1079         return 0;
1080 }
1081
1082 static int proc_submiturb(struct dev_state *ps, void __user *arg)
1083 {
1084         struct usbdevfs_urb uurb;
1085
1086         if (copy_from_user(&uurb, arg, sizeof(uurb)))
1087                 return -EFAULT;
1088
1089         return proc_do_submiturb(ps, &uurb, (((struct usbdevfs_urb __user *)arg)->iso_frame_desc), arg);
1090 }
1091
1092 static int proc_unlinkurb(struct dev_state *ps, void __user *arg)
1093 {
1094         struct async *as;
1095
1096         as = async_getpending(ps, arg);
1097         if (!as)
1098                 return -EINVAL;
1099         usb_kill_urb(as->urb);
1100         return 0;
1101 }
1102
1103 static int processcompl(struct async *as, void __user * __user *arg)
1104 {
1105         struct urb *urb = as->urb;
1106         struct usbdevfs_urb __user *userurb = as->userurb;
1107         void __user *addr = as->userurb;
1108         unsigned int i;
1109
1110         if (as->userbuffer)
1111                 if (copy_to_user(as->userbuffer, urb->transfer_buffer, urb->transfer_buffer_length))
1112                         return -EFAULT;
1113         if (put_user(urb->status, &userurb->status))
1114                 return -EFAULT;
1115         if (put_user(urb->actual_length, &userurb->actual_length))
1116                 return -EFAULT;
1117         if (put_user(urb->error_count, &userurb->error_count))
1118                 return -EFAULT;
1119
1120         if (usb_pipeisoc(urb->pipe)) {
1121                 for (i = 0; i < urb->number_of_packets; i++) {
1122                         if (put_user(urb->iso_frame_desc[i].actual_length,
1123                                      &userurb->iso_frame_desc[i].actual_length))
1124                                 return -EFAULT;
1125                         if (put_user(urb->iso_frame_desc[i].status,
1126                                      &userurb->iso_frame_desc[i].status))
1127                                 return -EFAULT;
1128                 }
1129         }
1130
1131         free_async(as);
1132
1133         if (put_user(addr, (void __user * __user *)arg))
1134                 return -EFAULT;
1135         return 0;
1136 }
1137
1138 static struct async* reap_as(struct dev_state *ps)
1139 {
1140         DECLARE_WAITQUEUE(wait, current);
1141         struct async *as = NULL;
1142         struct usb_device *dev = ps->dev;
1143
1144         add_wait_queue(&ps->wait, &wait);
1145         for (;;) {
1146                 __set_current_state(TASK_INTERRUPTIBLE);
1147                 if ((as = async_getcompleted(ps)))
1148                         break;
1149                 if (signal_pending(current))
1150                         break;
1151                 usb_unlock_device(dev);
1152                 schedule();
1153                 usb_lock_device(dev);
1154         }
1155         remove_wait_queue(&ps->wait, &wait);
1156         set_current_state(TASK_RUNNING);
1157         return as;
1158 }
1159
1160 static int proc_reapurb(struct dev_state *ps, void __user *arg)
1161 {
1162         struct async *as = reap_as(ps);
1163         if (as)
1164                 return processcompl(as, (void __user * __user *)arg);
1165         if (signal_pending(current))
1166                 return -EINTR;
1167         return -EIO;
1168 }
1169
1170 static int proc_reapurbnonblock(struct dev_state *ps, void __user *arg)
1171 {
1172         struct async *as;
1173
1174         if (!(as = async_getcompleted(ps)))
1175                 return -EAGAIN;
1176         return processcompl(as, (void __user * __user *)arg);
1177 }
1178
1179 #ifdef CONFIG_COMPAT
1180
1181 static int get_urb32(struct usbdevfs_urb *kurb,
1182                      struct usbdevfs_urb32 __user *uurb)
1183 {
1184         __u32  uptr;
1185         if (get_user(kurb->type, &uurb->type) ||
1186             __get_user(kurb->endpoint, &uurb->endpoint) ||
1187             __get_user(kurb->status, &uurb->status) ||
1188             __get_user(kurb->flags, &uurb->flags) ||
1189             __get_user(kurb->buffer_length, &uurb->buffer_length) ||
1190             __get_user(kurb->actual_length, &uurb->actual_length) ||
1191             __get_user(kurb->start_frame, &uurb->start_frame) ||
1192             __get_user(kurb->number_of_packets, &uurb->number_of_packets) ||
1193             __get_user(kurb->error_count, &uurb->error_count) ||
1194             __get_user(kurb->signr, &uurb->signr))
1195                 return -EFAULT;
1196
1197         if (__get_user(uptr, &uurb->buffer))
1198                 return -EFAULT;
1199         kurb->buffer = compat_ptr(uptr);
1200         if (__get_user(uptr, &uurb->buffer))
1201                 return -EFAULT;
1202         kurb->usercontext = compat_ptr(uptr);
1203
1204         return 0;
1205 }
1206
1207 static int proc_submiturb_compat(struct dev_state *ps, void __user *arg)
1208 {
1209         struct usbdevfs_urb uurb;
1210
1211         if (get_urb32(&uurb,(struct usbdevfs_urb32 *)arg))
1212                 return -EFAULT;
1213
1214         return proc_do_submiturb(ps, &uurb, ((struct usbdevfs_urb32 __user *)arg)->iso_frame_desc, arg);
1215 }
1216
1217 static int processcompl_compat(struct async *as, void __user * __user *arg)
1218 {
1219         struct urb *urb = as->urb;
1220         struct usbdevfs_urb32 __user *userurb = as->userurb;
1221         void __user *addr = as->userurb;
1222         unsigned int i;
1223
1224         if (as->userbuffer)
1225                 if (copy_to_user(as->userbuffer, urb->transfer_buffer, urb->transfer_buffer_length))
1226                         return -EFAULT;
1227         if (put_user(urb->status, &userurb->status))
1228                 return -EFAULT;
1229         if (put_user(urb->actual_length, &userurb->actual_length))
1230                 return -EFAULT;
1231         if (put_user(urb->error_count, &userurb->error_count))
1232                 return -EFAULT;
1233
1234         if (usb_pipeisoc(urb->pipe)) {
1235                 for (i = 0; i < urb->number_of_packets; i++) {
1236                         if (put_user(urb->iso_frame_desc[i].actual_length,
1237                                      &userurb->iso_frame_desc[i].actual_length))
1238                                 return -EFAULT;
1239                         if (put_user(urb->iso_frame_desc[i].status,
1240                                      &userurb->iso_frame_desc[i].status))
1241                                 return -EFAULT;
1242                 }
1243         }
1244
1245         free_async(as);
1246         if (put_user((u32)(u64)addr, (u32 __user *)arg))
1247                 return -EFAULT;
1248         return 0;
1249 }
1250
1251 static int proc_reapurb_compat(struct dev_state *ps, void __user *arg)
1252 {
1253         struct async *as = reap_as(ps);
1254         if (as)
1255                 return processcompl_compat(as, (void __user * __user *)arg);
1256         if (signal_pending(current))
1257                 return -EINTR;
1258         return -EIO;
1259 }
1260
1261 static int proc_reapurbnonblock_compat(struct dev_state *ps, void __user *arg)
1262 {
1263         struct async *as;
1264
1265         if (!(as = async_getcompleted(ps)))
1266                 return -EAGAIN;
1267         return processcompl_compat(as, (void __user * __user *)arg);
1268 }
1269
1270 #endif
1271
1272 static int proc_disconnectsignal(struct dev_state *ps, void __user *arg)
1273 {
1274         struct usbdevfs_disconnectsignal ds;
1275
1276         if (copy_from_user(&ds, arg, sizeof(ds)))
1277                 return -EFAULT;
1278         if (ds.signr != 0 && (ds.signr < SIGRTMIN || ds.signr > SIGRTMAX))
1279                 return -EINVAL;
1280         ps->discsignr = ds.signr;
1281         ps->disccontext = ds.context;
1282         return 0;
1283 }
1284
1285 static int proc_claiminterface(struct dev_state *ps, void __user *arg)
1286 {
1287         unsigned int ifnum;
1288
1289         if (get_user(ifnum, (unsigned int __user *)arg))
1290                 return -EFAULT;
1291         return claimintf(ps, ifnum);
1292 }
1293
1294 static int proc_releaseinterface(struct dev_state *ps, void __user *arg)
1295 {
1296         unsigned int ifnum;
1297         int ret;
1298
1299         if (get_user(ifnum, (unsigned int __user *)arg))
1300                 return -EFAULT;
1301         if ((ret = releaseintf(ps, ifnum)) < 0)
1302                 return ret;
1303         destroy_async_on_interface (ps, ifnum);
1304         return 0;
1305 }
1306
1307 static int proc_ioctl(struct dev_state *ps, struct usbdevfs_ioctl *ctl)
1308 {
1309         int                     size;
1310         void                    *buf = NULL;
1311         int                     retval = 0;
1312         struct usb_interface    *intf = NULL;
1313         struct usb_driver       *driver = NULL;
1314
1315         /* alloc buffer */
1316         if ((size = _IOC_SIZE (ctl->ioctl_code)) > 0) {
1317                 if ((buf = kmalloc (size, GFP_KERNEL)) == NULL)
1318                         return -ENOMEM;
1319                 if ((_IOC_DIR(ctl->ioctl_code) & _IOC_WRITE)) {
1320                         if (copy_from_user (buf, ctl->data, size)) {
1321                                 kfree(buf);
1322                                 return -EFAULT;
1323                         }
1324                 } else {
1325                         memset (buf, 0, size);
1326                 }
1327         }
1328
1329         if (!connected(ps->dev)) {
1330                 kfree(buf);
1331                 return -ENODEV;
1332         }
1333
1334         if (ps->dev->state != USB_STATE_CONFIGURED)
1335                 retval = -EHOSTUNREACH;
1336         else if (!(intf = usb_ifnum_to_if (ps->dev, ctl->ifno)))
1337                retval = -EINVAL;
1338         else switch (ctl->ioctl_code) {
1339
1340         /* disconnect kernel driver from interface */
1341         case USBDEVFS_DISCONNECT:
1342
1343                 down_write(&usb_bus_type.subsys.rwsem);
1344                 if (intf->dev.driver) {
1345                         driver = to_usb_driver(intf->dev.driver);
1346                         dev_dbg (&intf->dev, "disconnect by usbfs\n");
1347                         usb_driver_release_interface(driver, intf);
1348                 } else
1349                         retval = -ENODATA;
1350                 up_write(&usb_bus_type.subsys.rwsem);
1351                 break;
1352
1353         /* let kernel drivers try to (re)bind to the interface */
1354         case USBDEVFS_CONNECT:
1355                 usb_unlock_device(ps->dev);
1356                 bus_rescan_devices(intf->dev.bus);
1357                 usb_lock_device(ps->dev);
1358                 break;
1359
1360         /* talk directly to the interface's driver */
1361         default:
1362                 down_read(&usb_bus_type.subsys.rwsem);
1363                 if (intf->dev.driver)
1364                         driver = to_usb_driver(intf->dev.driver);
1365                 if (driver == NULL || driver->ioctl == NULL) {
1366                         retval = -ENOTTY;
1367                 } else {
1368                         retval = driver->ioctl (intf, ctl->ioctl_code, buf);
1369                         if (retval == -ENOIOCTLCMD)
1370                                 retval = -ENOTTY;
1371                 }
1372                 up_read(&usb_bus_type.subsys.rwsem);
1373         }
1374
1375         /* cleanup and return */
1376         if (retval >= 0
1377                         && (_IOC_DIR (ctl->ioctl_code) & _IOC_READ) != 0
1378                         && size > 0
1379                         && copy_to_user (ctl->data, buf, size) != 0)
1380                 retval = -EFAULT;
1381
1382         kfree(buf);
1383         return retval;
1384 }
1385
1386 static int proc_ioctl_default(struct dev_state *ps, void __user *arg)
1387 {
1388         struct usbdevfs_ioctl   ctrl;
1389
1390         if (copy_from_user(&ctrl, arg, sizeof (ctrl)))
1391                 return -EFAULT;
1392         return proc_ioctl(ps, &ctrl);
1393 }
1394
1395 #ifdef CONFIG_COMPAT
1396 static int proc_ioctl_compat(struct dev_state *ps, compat_uptr_t arg)
1397 {
1398         struct usbdevfs_ioctl32 __user *uioc;
1399         struct usbdevfs_ioctl ctrl;
1400         u32 udata;
1401
1402         uioc = compat_ptr((long)arg);
1403         if (get_user(ctrl.ifno, &uioc->ifno) ||
1404             get_user(ctrl.ioctl_code, &uioc->ioctl_code) ||
1405             __get_user(udata, &uioc->data))
1406                 return -EFAULT;
1407         ctrl.data = compat_ptr(udata);
1408
1409         return proc_ioctl(ps, &ctrl);
1410 }
1411 #endif
1412
1413 /*
1414  * NOTE:  All requests here that have interface numbers as parameters
1415  * are assuming that somehow the configuration has been prevented from
1416  * changing.  But there's no mechanism to ensure that...
1417  */
1418 static int usbdev_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
1419 {
1420         struct dev_state *ps = (struct dev_state *)file->private_data;
1421         struct usb_device *dev = ps->dev;
1422         void __user *p = (void __user *)arg;
1423         int ret = -ENOTTY;
1424
1425         if (!(file->f_mode & FMODE_WRITE))
1426                 return -EPERM;
1427         usb_lock_device(dev);
1428         if (!connected(dev)) {
1429                 usb_unlock_device(dev);
1430                 return -ENODEV;
1431         }
1432
1433         switch (cmd) {
1434         case USBDEVFS_CONTROL:
1435                 snoop(&dev->dev, "%s: CONTROL\n", __FUNCTION__);
1436                 ret = proc_control(ps, p);
1437                 if (ret >= 0)
1438                         inode->i_mtime = CURRENT_TIME;
1439                 break;
1440
1441         case USBDEVFS_BULK:
1442                 snoop(&dev->dev, "%s: BULK\n", __FUNCTION__);
1443                 ret = proc_bulk(ps, p);
1444                 if (ret >= 0)
1445                         inode->i_mtime = CURRENT_TIME;
1446                 break;
1447
1448         case USBDEVFS_RESETEP:
1449                 snoop(&dev->dev, "%s: RESETEP\n", __FUNCTION__);
1450                 ret = proc_resetep(ps, p);
1451                 if (ret >= 0)
1452                         inode->i_mtime = CURRENT_TIME;
1453                 break;
1454
1455         case USBDEVFS_RESET:
1456                 snoop(&dev->dev, "%s: RESET\n", __FUNCTION__);
1457                 ret = proc_resetdevice(ps);
1458                 break;
1459
1460         case USBDEVFS_CLEAR_HALT:
1461                 snoop(&dev->dev, "%s: CLEAR_HALT\n", __FUNCTION__);
1462                 ret = proc_clearhalt(ps, p);
1463                 if (ret >= 0)
1464                         inode->i_mtime = CURRENT_TIME;
1465                 break;
1466
1467         case USBDEVFS_GETDRIVER:
1468                 snoop(&dev->dev, "%s: GETDRIVER\n", __FUNCTION__);
1469                 ret = proc_getdriver(ps, p);
1470                 break;
1471
1472         case USBDEVFS_CONNECTINFO:
1473                 snoop(&dev->dev, "%s: CONNECTINFO\n", __FUNCTION__);
1474                 ret = proc_connectinfo(ps, p);
1475                 break;
1476
1477         case USBDEVFS_SETINTERFACE:
1478                 snoop(&dev->dev, "%s: SETINTERFACE\n", __FUNCTION__);
1479                 ret = proc_setintf(ps, p);
1480                 break;
1481
1482         case USBDEVFS_SETCONFIGURATION:
1483                 snoop(&dev->dev, "%s: SETCONFIGURATION\n", __FUNCTION__);
1484                 ret = proc_setconfig(ps, p);
1485                 break;
1486
1487         case USBDEVFS_SUBMITURB:
1488                 snoop(&dev->dev, "%s: SUBMITURB\n", __FUNCTION__);
1489                 ret = proc_submiturb(ps, p);
1490                 if (ret >= 0)
1491                         inode->i_mtime = CURRENT_TIME;
1492                 break;
1493
1494 #ifdef CONFIG_COMPAT
1495
1496         case USBDEVFS_SUBMITURB32:
1497                 snoop(&dev->dev, "%s: SUBMITURB32\n", __FUNCTION__);
1498                 ret = proc_submiturb_compat(ps, p);
1499                 if (ret >= 0)
1500                         inode->i_mtime = CURRENT_TIME;
1501                 break;
1502
1503         case USBDEVFS_REAPURB32:
1504                 snoop(&dev->dev, "%s: REAPURB32\n", __FUNCTION__);
1505                 ret = proc_reapurb_compat(ps, p);
1506                 break;
1507
1508         case USBDEVFS_REAPURBNDELAY32:
1509                 snoop(&dev->dev, "%s: REAPURBDELAY32\n", __FUNCTION__);
1510                 ret = proc_reapurbnonblock_compat(ps, p);
1511                 break;
1512
1513         case USBDEVFS_IOCTL32:
1514                 snoop(&dev->dev, "%s: IOCTL\n", __FUNCTION__);
1515                 ret = proc_ioctl_compat(ps, (compat_uptr_t)(long)p);
1516                 break;
1517 #endif
1518
1519         case USBDEVFS_DISCARDURB:
1520                 snoop(&dev->dev, "%s: DISCARDURB\n", __FUNCTION__);
1521                 ret = proc_unlinkurb(ps, p);
1522                 break;
1523
1524         case USBDEVFS_REAPURB:
1525                 snoop(&dev->dev, "%s: REAPURB\n", __FUNCTION__);
1526                 ret = proc_reapurb(ps, p);
1527                 break;
1528
1529         case USBDEVFS_REAPURBNDELAY:
1530                 snoop(&dev->dev, "%s: REAPURBDELAY\n", __FUNCTION__);
1531                 ret = proc_reapurbnonblock(ps, p);
1532                 break;
1533
1534         case USBDEVFS_DISCSIGNAL:
1535                 snoop(&dev->dev, "%s: DISCSIGNAL\n", __FUNCTION__);
1536                 ret = proc_disconnectsignal(ps, p);
1537                 break;
1538
1539         case USBDEVFS_CLAIMINTERFACE:
1540                 snoop(&dev->dev, "%s: CLAIMINTERFACE\n", __FUNCTION__);
1541                 ret = proc_claiminterface(ps, p);
1542                 break;
1543
1544         case USBDEVFS_RELEASEINTERFACE:
1545                 snoop(&dev->dev, "%s: RELEASEINTERFACE\n", __FUNCTION__);
1546                 ret = proc_releaseinterface(ps, p);
1547                 break;
1548
1549         case USBDEVFS_IOCTL:
1550                 snoop(&dev->dev, "%s: IOCTL\n", __FUNCTION__);
1551                 ret = proc_ioctl_default(ps, p);
1552                 break;
1553         }
1554         usb_unlock_device(dev);
1555         if (ret >= 0)
1556                 inode->i_atime = CURRENT_TIME;
1557         return ret;
1558 }
1559
1560 /* No kernel lock - fine */
1561 static unsigned int usbdev_poll(struct file *file, struct poll_table_struct *wait)
1562 {
1563         struct dev_state *ps = (struct dev_state *)file->private_data;
1564         unsigned int mask = 0;
1565
1566         poll_wait(file, &ps->wait, wait);
1567         if (file->f_mode & FMODE_WRITE && !list_empty(&ps->async_completed))
1568                 mask |= POLLOUT | POLLWRNORM;
1569         if (!connected(ps->dev))
1570                 mask |= POLLERR | POLLHUP;
1571         return mask;
1572 }
1573
1574 struct file_operations usbfs_device_file_operations = {
1575         .llseek =       usbdev_lseek,
1576         .read =         usbdev_read,
1577         .poll =         usbdev_poll,
1578         .ioctl =        usbdev_ioctl,
1579         .open =         usbdev_open,
1580         .release =      usbdev_release,
1581 };
1582
1583 static void usbdev_add(struct usb_device *dev)
1584 {
1585         int minor = ((dev->bus->busnum-1) * 128) + (dev->devnum-1);
1586
1587         dev->class_dev = class_device_create(usb_device_class, NULL,
1588                                 MKDEV(USB_DEVICE_MAJOR, minor), &dev->dev,
1589                                 "usbdev%d.%d", dev->bus->busnum, dev->devnum);
1590
1591         dev->class_dev->class_data = dev;
1592 }
1593
1594 static void usbdev_remove(struct usb_device *dev)
1595 {
1596         class_device_unregister(dev->class_dev);
1597 }
1598
1599 static int usbdev_notify(struct notifier_block *self, unsigned long action,
1600                          void *dev)
1601 {
1602         switch (action) {
1603         case USB_DEVICE_ADD:
1604                 usbdev_add(dev);
1605                 break;
1606         case USB_DEVICE_REMOVE:
1607                 usbdev_remove(dev);
1608                 break;
1609         }
1610         return NOTIFY_OK;
1611 }
1612
1613 static struct notifier_block usbdev_nb = {
1614         .notifier_call =        usbdev_notify,
1615 };
1616
1617 static struct cdev usb_device_cdev = {
1618         .kobj   = {.name = "usb_device", },
1619         .owner  = THIS_MODULE,
1620 };
1621
1622 int __init usbdev_init(void)
1623 {
1624         int retval;
1625
1626         retval = register_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX,
1627                         "usb_device");
1628         if (retval) {
1629                 err("unable to register minors for usb_device");
1630                 goto out;
1631         }
1632         cdev_init(&usb_device_cdev, &usbfs_device_file_operations);
1633         retval = cdev_add(&usb_device_cdev, USB_DEVICE_DEV, USB_DEVICE_MAX);
1634         if (retval) {
1635                 err("unable to get usb_device major %d", USB_DEVICE_MAJOR);
1636                 goto error_cdev;
1637         }
1638         usb_device_class = class_create(THIS_MODULE, "usb_device");
1639         if (IS_ERR(usb_device_class)) {
1640                 err("unable to register usb_device class");
1641                 retval = PTR_ERR(usb_device_class);
1642                 goto error_class;
1643         }
1644
1645         usb_register_notify(&usbdev_nb);
1646
1647 out:
1648         return retval;
1649
1650 error_class:
1651         usb_device_class = NULL;
1652         cdev_del(&usb_device_cdev);
1653
1654 error_cdev:
1655         unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
1656         goto out;
1657 }
1658
1659 void usbdev_cleanup(void)
1660 {
1661         usb_unregister_notify(&usbdev_nb);
1662         class_destroy(usb_device_class);
1663         cdev_del(&usb_device_cdev);
1664         unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
1665 }
1666