[PATCH] USB: Allow high-bandwidth isochronous packets via usbfs
[linux-2.6.git] / drivers / usb / core / devio.c
1 /*****************************************************************************/
2
3 /*
4  *      devio.c  --  User space communication with USB devices.
5  *
6  *      Copyright (C) 1999-2000  Thomas Sailer (sailer@ife.ee.ethz.ch)
7  *
8  *      This program is free software; you can redistribute it and/or modify
9  *      it under the terms of the GNU General Public License as published by
10  *      the Free Software Foundation; either version 2 of the License, or
11  *      (at your option) any later version.
12  *
13  *      This program is distributed in the hope that it will be useful,
14  *      but WITHOUT ANY WARRANTY; without even the implied warranty of
15  *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16  *      GNU General Public License for more details.
17  *
18  *      You should have received a copy of the GNU General Public License
19  *      along with this program; if not, write to the Free Software
20  *      Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
21  *
22  *  $Id: devio.c,v 1.7 2000/02/01 17:28:48 fliegl Exp $
23  *
24  *  This file implements the usbfs/x/y files, where
25  *  x is the bus number and y the device number.
26  *
27  *  It allows user space programs/"drivers" to communicate directly
28  *  with USB devices without intervening kernel driver.
29  *
30  *  Revision history
31  *    22.12.1999   0.1   Initial release (split from proc_usb.c)
32  *    04.01.2000   0.2   Turned into its own filesystem
33  *    30.09.2005   0.3   Fix user-triggerable oops in async URB delivery
34  *                       (CAN-2005-3055)
35  */
36
37 /*****************************************************************************/
38
39 #include <linux/fs.h>
40 #include <linux/mm.h>
41 #include <linux/slab.h>
42 #include <linux/smp_lock.h>
43 #include <linux/signal.h>
44 #include <linux/poll.h>
45 #include <linux/module.h>
46 #include <linux/usb.h>
47 #include <linux/usbdevice_fs.h>
48 #include <linux/cdev.h>
49 #include <linux/notifier.h>
50 #include <asm/uaccess.h>
51 #include <asm/byteorder.h>
52 #include <linux/moduleparam.h>
53
54 #include "hcd.h"        /* for usbcore internals */
55 #include "usb.h"
56
57 #define USB_MAXBUS                      64
58 #define USB_DEVICE_MAX                  USB_MAXBUS * 128
59 static struct class *usb_device_class;
60
61 struct async {
62         struct list_head asynclist;
63         struct dev_state *ps;
64         pid_t pid;
65         uid_t uid, euid;
66         unsigned int signr;
67         unsigned int ifnum;
68         void __user *userbuffer;
69         void __user *userurb;
70         struct urb *urb;
71 };
72
73 static int usbfs_snoop = 0;
74 module_param (usbfs_snoop, bool, S_IRUGO | S_IWUSR);
75 MODULE_PARM_DESC (usbfs_snoop, "true to log all usbfs traffic");
76
77 #define snoop(dev, format, arg...)                              \
78         do {                                                    \
79                 if (usbfs_snoop)                                \
80                         dev_info( dev , format , ## arg);       \
81         } while (0)
82
83 #define USB_DEVICE_DEV          MKDEV(USB_DEVICE_MAJOR, 0)
84
85
86 #define MAX_USBFS_BUFFER_SIZE   16384
87
88 static inline int connected (struct usb_device *dev)
89 {
90         return dev->state != USB_STATE_NOTATTACHED;
91 }
92
93 static loff_t usbdev_lseek(struct file *file, loff_t offset, int orig)
94 {
95         loff_t ret;
96
97         lock_kernel();
98
99         switch (orig) {
100         case 0:
101                 file->f_pos = offset;
102                 ret = file->f_pos;
103                 break;
104         case 1:
105                 file->f_pos += offset;
106                 ret = file->f_pos;
107                 break;
108         case 2:
109         default:
110                 ret = -EINVAL;
111         }
112
113         unlock_kernel();
114         return ret;
115 }
116
117 static ssize_t usbdev_read(struct file *file, char __user *buf, size_t nbytes, loff_t *ppos)
118 {
119         struct dev_state *ps = (struct dev_state *)file->private_data;
120         struct usb_device *dev = ps->dev;
121         ssize_t ret = 0;
122         unsigned len;
123         loff_t pos;
124         int i;
125
126         pos = *ppos;
127         usb_lock_device(dev);
128         if (!connected(dev)) {
129                 ret = -ENODEV;
130                 goto err;
131         } else if (pos < 0) {
132                 ret = -EINVAL;
133                 goto err;
134         }
135
136         if (pos < sizeof(struct usb_device_descriptor)) {
137                 struct usb_device_descriptor temp_desc ; /* 18 bytes - fits on the stack */
138
139                 memcpy(&temp_desc, &dev->descriptor, sizeof(dev->descriptor));
140                 le16_to_cpus(&temp_desc.bcdUSB);
141                 le16_to_cpus(&temp_desc.idVendor);
142                 le16_to_cpus(&temp_desc.idProduct);
143                 le16_to_cpus(&temp_desc.bcdDevice);
144
145                 len = sizeof(struct usb_device_descriptor) - pos;
146                 if (len > nbytes)
147                         len = nbytes;
148                 if (copy_to_user(buf, ((char *)&temp_desc) + pos, len)) {
149                         ret = -EFAULT;
150                         goto err;
151                 }
152
153                 *ppos += len;
154                 buf += len;
155                 nbytes -= len;
156                 ret += len;
157         }
158
159         pos = sizeof(struct usb_device_descriptor);
160         for (i = 0; nbytes && i < dev->descriptor.bNumConfigurations; i++) {
161                 struct usb_config_descriptor *config =
162                         (struct usb_config_descriptor *)dev->rawdescriptors[i];
163                 unsigned int length = le16_to_cpu(config->wTotalLength);
164
165                 if (*ppos < pos + length) {
166
167                         /* The descriptor may claim to be longer than it
168                          * really is.  Here is the actual allocated length. */
169                         unsigned alloclen =
170                                 le16_to_cpu(dev->config[i].desc.wTotalLength);
171
172                         len = length - (*ppos - pos);
173                         if (len > nbytes)
174                                 len = nbytes;
175
176                         /* Simply don't write (skip over) unallocated parts */
177                         if (alloclen > (*ppos - pos)) {
178                                 alloclen -= (*ppos - pos);
179                                 if (copy_to_user(buf,
180                                     dev->rawdescriptors[i] + (*ppos - pos),
181                                     min(len, alloclen))) {
182                                         ret = -EFAULT;
183                                         goto err;
184                                 }
185                         }
186
187                         *ppos += len;
188                         buf += len;
189                         nbytes -= len;
190                         ret += len;
191                 }
192
193                 pos += length;
194         }
195
196 err:
197         usb_unlock_device(dev);
198         return ret;
199 }
200
201 /*
202  * async list handling
203  */
204
205 static struct async *alloc_async(unsigned int numisoframes)
206 {
207         unsigned int assize = sizeof(struct async) + numisoframes * sizeof(struct usb_iso_packet_descriptor);
208         struct async *as = kzalloc(assize, GFP_KERNEL);
209
210         if (!as)
211                 return NULL;
212         as->urb = usb_alloc_urb(numisoframes, GFP_KERNEL);
213         if (!as->urb) {
214                 kfree(as);
215                 return NULL;
216         }
217         return as;
218 }
219
220 static void free_async(struct async *as)
221 {
222         kfree(as->urb->transfer_buffer);
223         kfree(as->urb->setup_packet);
224         usb_free_urb(as->urb);
225         kfree(as);
226 }
227
228 static inline void async_newpending(struct async *as)
229 {
230         struct dev_state *ps = as->ps;
231         unsigned long flags;
232         
233         spin_lock_irqsave(&ps->lock, flags);
234         list_add_tail(&as->asynclist, &ps->async_pending);
235         spin_unlock_irqrestore(&ps->lock, flags);
236 }
237
238 static inline void async_removepending(struct async *as)
239 {
240         struct dev_state *ps = as->ps;
241         unsigned long flags;
242         
243         spin_lock_irqsave(&ps->lock, flags);
244         list_del_init(&as->asynclist);
245         spin_unlock_irqrestore(&ps->lock, flags);
246 }
247
248 static inline struct async *async_getcompleted(struct dev_state *ps)
249 {
250         unsigned long flags;
251         struct async *as = NULL;
252
253         spin_lock_irqsave(&ps->lock, flags);
254         if (!list_empty(&ps->async_completed)) {
255                 as = list_entry(ps->async_completed.next, struct async, asynclist);
256                 list_del_init(&as->asynclist);
257         }
258         spin_unlock_irqrestore(&ps->lock, flags);
259         return as;
260 }
261
262 static inline struct async *async_getpending(struct dev_state *ps, void __user *userurb)
263 {
264         unsigned long flags;
265         struct async *as;
266
267         spin_lock_irqsave(&ps->lock, flags);
268         list_for_each_entry(as, &ps->async_pending, asynclist)
269                 if (as->userurb == userurb) {
270                         list_del_init(&as->asynclist);
271                         spin_unlock_irqrestore(&ps->lock, flags);
272                         return as;
273                 }
274         spin_unlock_irqrestore(&ps->lock, flags);
275         return NULL;
276 }
277
278 static void snoop_urb(struct urb *urb, void __user *userurb)
279 {
280         int j;
281         unsigned char *data = urb->transfer_buffer;
282
283         if (!usbfs_snoop)
284                 return;
285
286         if (urb->pipe & USB_DIR_IN)
287                 dev_info(&urb->dev->dev, "direction=IN\n");
288         else
289                 dev_info(&urb->dev->dev, "direction=OUT\n");
290         dev_info(&urb->dev->dev, "userurb=%p\n", userurb);
291         dev_info(&urb->dev->dev, "transfer_buffer_length=%d\n",
292                  urb->transfer_buffer_length);
293         dev_info(&urb->dev->dev, "actual_length=%d\n", urb->actual_length);
294         dev_info(&urb->dev->dev, "data: ");
295         for (j = 0; j < urb->transfer_buffer_length; ++j)
296                 printk ("%02x ", data[j]);
297         printk("\n");
298 }
299
300 static void async_completed(struct urb *urb, struct pt_regs *regs)
301 {
302         struct async *as = (struct async *)urb->context;
303         struct dev_state *ps = as->ps;
304         struct siginfo sinfo;
305
306         spin_lock(&ps->lock);
307         list_move_tail(&as->asynclist, &ps->async_completed);
308         spin_unlock(&ps->lock);
309         if (as->signr) {
310                 sinfo.si_signo = as->signr;
311                 sinfo.si_errno = as->urb->status;
312                 sinfo.si_code = SI_ASYNCIO;
313                 sinfo.si_addr = as->userurb;
314                 kill_proc_info_as_uid(as->signr, &sinfo, as->pid, as->uid, 
315                                       as->euid);
316         }
317         snoop(&urb->dev->dev, "urb complete\n");
318         snoop_urb(urb, as->userurb);
319         wake_up(&ps->wait);
320 }
321
322 static void destroy_async (struct dev_state *ps, struct list_head *list)
323 {
324         struct async *as;
325         unsigned long flags;
326
327         spin_lock_irqsave(&ps->lock, flags);
328         while (!list_empty(list)) {
329                 as = list_entry(list->next, struct async, asynclist);
330                 list_del_init(&as->asynclist);
331
332                 /* drop the spinlock so the completion handler can run */
333                 spin_unlock_irqrestore(&ps->lock, flags);
334                 usb_kill_urb(as->urb);
335                 spin_lock_irqsave(&ps->lock, flags);
336         }
337         spin_unlock_irqrestore(&ps->lock, flags);
338         as = async_getcompleted(ps);
339         while (as) {
340                 free_async(as);
341                 as = async_getcompleted(ps);
342         }
343 }
344
345 static void destroy_async_on_interface (struct dev_state *ps, unsigned int ifnum)
346 {
347         struct list_head *p, *q, hitlist;
348         unsigned long flags;
349
350         INIT_LIST_HEAD(&hitlist);
351         spin_lock_irqsave(&ps->lock, flags);
352         list_for_each_safe(p, q, &ps->async_pending)
353                 if (ifnum == list_entry(p, struct async, asynclist)->ifnum)
354                         list_move_tail(p, &hitlist);
355         spin_unlock_irqrestore(&ps->lock, flags);
356         destroy_async(ps, &hitlist);
357 }
358
359 static inline void destroy_all_async(struct dev_state *ps)
360 {
361                 destroy_async(ps, &ps->async_pending);
362 }
363
364 /*
365  * interface claims are made only at the request of user level code,
366  * which can also release them (explicitly or by closing files).
367  * they're also undone when devices disconnect.
368  */
369
370 static int driver_probe (struct usb_interface *intf,
371                          const struct usb_device_id *id)
372 {
373         return -ENODEV;
374 }
375
376 static void driver_disconnect(struct usb_interface *intf)
377 {
378         struct dev_state *ps = usb_get_intfdata (intf);
379         unsigned int ifnum = intf->altsetting->desc.bInterfaceNumber;
380
381         if (!ps)
382                 return;
383
384         /* NOTE:  this relies on usbcore having canceled and completed
385          * all pending I/O requests; 2.6 does that.
386          */
387
388         if (likely(ifnum < 8*sizeof(ps->ifclaimed)))
389                 clear_bit(ifnum, &ps->ifclaimed);
390         else
391                 warn("interface number %u out of range", ifnum);
392
393         usb_set_intfdata (intf, NULL);
394
395         /* force async requests to complete */
396         destroy_async_on_interface(ps, ifnum);
397 }
398
399 struct usb_driver usbfs_driver = {
400         .name =         "usbfs",
401         .probe =        driver_probe,
402         .disconnect =   driver_disconnect,
403 };
404
405 static int claimintf(struct dev_state *ps, unsigned int ifnum)
406 {
407         struct usb_device *dev = ps->dev;
408         struct usb_interface *intf;
409         int err;
410
411         if (ifnum >= 8*sizeof(ps->ifclaimed))
412                 return -EINVAL;
413         /* already claimed */
414         if (test_bit(ifnum, &ps->ifclaimed))
415                 return 0;
416
417         /* lock against other changes to driver bindings */
418         down_write(&usb_bus_type.subsys.rwsem);
419         intf = usb_ifnum_to_if(dev, ifnum);
420         if (!intf)
421                 err = -ENOENT;
422         else
423                 err = usb_driver_claim_interface(&usbfs_driver, intf, ps);
424         up_write(&usb_bus_type.subsys.rwsem);
425         if (err == 0)
426                 set_bit(ifnum, &ps->ifclaimed);
427         return err;
428 }
429
430 static int releaseintf(struct dev_state *ps, unsigned int ifnum)
431 {
432         struct usb_device *dev;
433         struct usb_interface *intf;
434         int err;
435
436         err = -EINVAL;
437         if (ifnum >= 8*sizeof(ps->ifclaimed))
438                 return err;
439         dev = ps->dev;
440         /* lock against other changes to driver bindings */
441         down_write(&usb_bus_type.subsys.rwsem);
442         intf = usb_ifnum_to_if(dev, ifnum);
443         if (!intf)
444                 err = -ENOENT;
445         else if (test_and_clear_bit(ifnum, &ps->ifclaimed)) {
446                 usb_driver_release_interface(&usbfs_driver, intf);
447                 err = 0;
448         }
449         up_write(&usb_bus_type.subsys.rwsem);
450         return err;
451 }
452
453 static int checkintf(struct dev_state *ps, unsigned int ifnum)
454 {
455         if (ps->dev->state != USB_STATE_CONFIGURED)
456                 return -EHOSTUNREACH;
457         if (ifnum >= 8*sizeof(ps->ifclaimed))
458                 return -EINVAL;
459         if (test_bit(ifnum, &ps->ifclaimed))
460                 return 0;
461         /* if not yet claimed, claim it for the driver */
462         dev_warn(&ps->dev->dev, "usbfs: process %d (%s) did not claim interface %u before use\n",
463                current->pid, current->comm, ifnum);
464         return claimintf(ps, ifnum);
465 }
466
467 static int findintfep(struct usb_device *dev, unsigned int ep)
468 {
469         unsigned int i, j, e;
470         struct usb_interface *intf;
471         struct usb_host_interface *alts;
472         struct usb_endpoint_descriptor *endpt;
473
474         if (ep & ~(USB_DIR_IN|0xf))
475                 return -EINVAL;
476         if (!dev->actconfig)
477                 return -ESRCH;
478         for (i = 0; i < dev->actconfig->desc.bNumInterfaces; i++) {
479                 intf = dev->actconfig->interface[i];
480                 for (j = 0; j < intf->num_altsetting; j++) {
481                         alts = &intf->altsetting[j];
482                         for (e = 0; e < alts->desc.bNumEndpoints; e++) {
483                                 endpt = &alts->endpoint[e].desc;
484                                 if (endpt->bEndpointAddress == ep)
485                                         return alts->desc.bInterfaceNumber;
486                         }
487                 }
488         }
489         return -ENOENT; 
490 }
491
492 static int check_ctrlrecip(struct dev_state *ps, unsigned int requesttype, unsigned int index)
493 {
494         int ret = 0;
495
496         if (ps->dev->state != USB_STATE_ADDRESS
497          && ps->dev->state != USB_STATE_CONFIGURED)
498                 return -EHOSTUNREACH;
499         if (USB_TYPE_VENDOR == (USB_TYPE_MASK & requesttype))
500                 return 0;
501
502         index &= 0xff;
503         switch (requesttype & USB_RECIP_MASK) {
504         case USB_RECIP_ENDPOINT:
505                 if ((ret = findintfep(ps->dev, index)) >= 0)
506                         ret = checkintf(ps, ret);
507                 break;
508
509         case USB_RECIP_INTERFACE:
510                 ret = checkintf(ps, index);
511                 break;
512         }
513         return ret;
514 }
515
516 static struct usb_device *usbdev_lookup_minor(int minor)
517 {
518         struct class_device *class_dev;
519         struct usb_device *dev = NULL;
520
521         down(&usb_device_class->sem);
522         list_for_each_entry(class_dev, &usb_device_class->children, node) {
523                 if (class_dev->devt == MKDEV(USB_DEVICE_MAJOR, minor)) {
524                         dev = class_dev->class_data;
525                         break;
526                 }
527         }
528         up(&usb_device_class->sem);
529
530         return dev;
531 };
532
533 /*
534  * file operations
535  */
536 static int usbdev_open(struct inode *inode, struct file *file)
537 {
538         struct usb_device *dev = NULL;
539         struct dev_state *ps;
540         int ret;
541
542         /* 
543          * no locking necessary here, as chrdev_open has the kernel lock
544          * (still acquire the kernel lock for safety)
545          */
546         ret = -ENOMEM;
547         if (!(ps = kmalloc(sizeof(struct dev_state), GFP_KERNEL)))
548                 goto out_nolock;
549
550         lock_kernel();
551         ret = -ENOENT;
552         /* check if we are called from a real node or usbfs */
553         if (imajor(inode) == USB_DEVICE_MAJOR)
554                 dev = usbdev_lookup_minor(iminor(inode));
555         if (!dev)
556                 dev = inode->u.generic_ip;
557         if (!dev) {
558                 kfree(ps);
559                 goto out;
560         }
561         usb_get_dev(dev);
562         ret = 0;
563         ps->dev = dev;
564         ps->file = file;
565         spin_lock_init(&ps->lock);
566         INIT_LIST_HEAD(&ps->async_pending);
567         INIT_LIST_HEAD(&ps->async_completed);
568         init_waitqueue_head(&ps->wait);
569         ps->discsignr = 0;
570         ps->disc_pid = current->pid;
571         ps->disc_uid = current->uid;
572         ps->disc_euid = current->euid;
573         ps->disccontext = NULL;
574         ps->ifclaimed = 0;
575         wmb();
576         list_add_tail(&ps->list, &dev->filelist);
577         file->private_data = ps;
578  out:
579         unlock_kernel();
580  out_nolock:
581         return ret;
582 }
583
584 static int usbdev_release(struct inode *inode, struct file *file)
585 {
586         struct dev_state *ps = (struct dev_state *)file->private_data;
587         struct usb_device *dev = ps->dev;
588         unsigned int ifnum;
589
590         usb_lock_device(dev);
591         list_del_init(&ps->list);
592         for (ifnum = 0; ps->ifclaimed && ifnum < 8*sizeof(ps->ifclaimed);
593                         ifnum++) {
594                 if (test_bit(ifnum, &ps->ifclaimed))
595                         releaseintf(ps, ifnum);
596         }
597         destroy_all_async(ps);
598         usb_unlock_device(dev);
599         usb_put_dev(dev);
600         ps->dev = NULL;
601         kfree(ps);
602         return 0;
603 }
604
605 static int proc_control(struct dev_state *ps, void __user *arg)
606 {
607         struct usb_device *dev = ps->dev;
608         struct usbdevfs_ctrltransfer ctrl;
609         unsigned int tmo;
610         unsigned char *tbuf;
611         int i, j, ret;
612
613         if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
614                 return -EFAULT;
615         if ((ret = check_ctrlrecip(ps, ctrl.bRequestType, ctrl.wIndex)))
616                 return ret;
617         if (ctrl.wLength > PAGE_SIZE)
618                 return -EINVAL;
619         if (!(tbuf = (unsigned char *)__get_free_page(GFP_KERNEL)))
620                 return -ENOMEM;
621         tmo = ctrl.timeout;
622         if (ctrl.bRequestType & 0x80) {
623                 if (ctrl.wLength && !access_ok(VERIFY_WRITE, ctrl.data, ctrl.wLength)) {
624                         free_page((unsigned long)tbuf);
625                         return -EINVAL;
626                 }
627                 snoop(&dev->dev, "control read: bRequest=%02x "
628                                 "bRrequestType=%02x wValue=%04x "
629                                 "wIndex=%04x wLength=%04x\n",
630                         ctrl.bRequest, ctrl.bRequestType, ctrl.wValue,
631                                 ctrl.wIndex, ctrl.wLength);
632
633                 usb_unlock_device(dev);
634                 i = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), ctrl.bRequest, ctrl.bRequestType,
635                                        ctrl.wValue, ctrl.wIndex, tbuf, ctrl.wLength, tmo);
636                 usb_lock_device(dev);
637                 if ((i > 0) && ctrl.wLength) {
638                         if (usbfs_snoop) {
639                                 dev_info(&dev->dev, "control read: data ");
640                                 for (j = 0; j < i; ++j)
641                                         printk("%02x ", (unsigned char)(tbuf)[j]);
642                                 printk("\n");
643                         }
644                         if (copy_to_user(ctrl.data, tbuf, i)) {
645                                 free_page((unsigned long)tbuf);
646                                 return -EFAULT;
647                         }
648                 }
649         } else {
650                 if (ctrl.wLength) {
651                         if (copy_from_user(tbuf, ctrl.data, ctrl.wLength)) {
652                                 free_page((unsigned long)tbuf);
653                                 return -EFAULT;
654                         }
655                 }
656                 snoop(&dev->dev, "control write: bRequest=%02x "
657                                 "bRrequestType=%02x wValue=%04x "
658                                 "wIndex=%04x wLength=%04x\n",
659                         ctrl.bRequest, ctrl.bRequestType, ctrl.wValue,
660                                 ctrl.wIndex, ctrl.wLength);
661                 if (usbfs_snoop) {
662                         dev_info(&dev->dev, "control write: data: ");
663                         for (j = 0; j < ctrl.wLength; ++j)
664                                 printk("%02x ", (unsigned char)(tbuf)[j]);
665                         printk("\n");
666                 }
667                 usb_unlock_device(dev);
668                 i = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), ctrl.bRequest, ctrl.bRequestType,
669                                        ctrl.wValue, ctrl.wIndex, tbuf, ctrl.wLength, tmo);
670                 usb_lock_device(dev);
671         }
672         free_page((unsigned long)tbuf);
673         if (i<0 && i != -EPIPE) {
674                 dev_printk(KERN_DEBUG, &dev->dev, "usbfs: USBDEVFS_CONTROL "
675                            "failed cmd %s rqt %u rq %u len %u ret %d\n",
676                            current->comm, ctrl.bRequestType, ctrl.bRequest,
677                            ctrl.wLength, i);
678         }
679         return i;
680 }
681
682 static int proc_bulk(struct dev_state *ps, void __user *arg)
683 {
684         struct usb_device *dev = ps->dev;
685         struct usbdevfs_bulktransfer bulk;
686         unsigned int tmo, len1, pipe;
687         int len2;
688         unsigned char *tbuf;
689         int i, j, ret;
690
691         if (copy_from_user(&bulk, arg, sizeof(bulk)))
692                 return -EFAULT;
693         if ((ret = findintfep(ps->dev, bulk.ep)) < 0)
694                 return ret;
695         if ((ret = checkintf(ps, ret)))
696                 return ret;
697         if (bulk.ep & USB_DIR_IN)
698                 pipe = usb_rcvbulkpipe(dev, bulk.ep & 0x7f);
699         else
700                 pipe = usb_sndbulkpipe(dev, bulk.ep & 0x7f);
701         if (!usb_maxpacket(dev, pipe, !(bulk.ep & USB_DIR_IN)))
702                 return -EINVAL;
703         len1 = bulk.len;
704         if (len1 > MAX_USBFS_BUFFER_SIZE)
705                 return -EINVAL;
706         if (!(tbuf = kmalloc(len1, GFP_KERNEL)))
707                 return -ENOMEM;
708         tmo = bulk.timeout;
709         if (bulk.ep & 0x80) {
710                 if (len1 && !access_ok(VERIFY_WRITE, bulk.data, len1)) {
711                         kfree(tbuf);
712                         return -EINVAL;
713                 }
714                 snoop(&dev->dev, "bulk read: len=0x%02x timeout=%04d\n",
715                         bulk.len, bulk.timeout);
716                 usb_unlock_device(dev);
717                 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
718                 usb_lock_device(dev);
719                 if (!i && len2) {
720                         if (usbfs_snoop) {
721                                 dev_info(&dev->dev, "bulk read: data ");
722                                 for (j = 0; j < len2; ++j)
723                                         printk("%02x ", (unsigned char)(tbuf)[j]);
724                                 printk("\n");
725                         }
726                         if (copy_to_user(bulk.data, tbuf, len2)) {
727                                 kfree(tbuf);
728                                 return -EFAULT;
729                         }
730                 }
731         } else {
732                 if (len1) {
733                         if (copy_from_user(tbuf, bulk.data, len1)) {
734                                 kfree(tbuf);
735                                 return -EFAULT;
736                         }
737                 }
738                 snoop(&dev->dev, "bulk write: len=0x%02x timeout=%04d\n",
739                         bulk.len, bulk.timeout);
740                 if (usbfs_snoop) {
741                         dev_info(&dev->dev, "bulk write: data: ");
742                         for (j = 0; j < len1; ++j)
743                                 printk("%02x ", (unsigned char)(tbuf)[j]);
744                         printk("\n");
745                 }
746                 usb_unlock_device(dev);
747                 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
748                 usb_lock_device(dev);
749         }
750         kfree(tbuf);
751         if (i < 0)
752                 return i;
753         return len2;
754 }
755
756 static int proc_resetep(struct dev_state *ps, void __user *arg)
757 {
758         unsigned int ep;
759         int ret;
760
761         if (get_user(ep, (unsigned int __user *)arg))
762                 return -EFAULT;
763         if ((ret = findintfep(ps->dev, ep)) < 0)
764                 return ret;
765         if ((ret = checkintf(ps, ret)))
766                 return ret;
767         usb_settoggle(ps->dev, ep & 0xf, !(ep & USB_DIR_IN), 0);
768         return 0;
769 }
770
771 static int proc_clearhalt(struct dev_state *ps, void __user *arg)
772 {
773         unsigned int ep;
774         int pipe;
775         int ret;
776
777         if (get_user(ep, (unsigned int __user *)arg))
778                 return -EFAULT;
779         if ((ret = findintfep(ps->dev, ep)) < 0)
780                 return ret;
781         if ((ret = checkintf(ps, ret)))
782                 return ret;
783         if (ep & USB_DIR_IN)
784                 pipe = usb_rcvbulkpipe(ps->dev, ep & 0x7f);
785         else
786                 pipe = usb_sndbulkpipe(ps->dev, ep & 0x7f);
787
788         return usb_clear_halt(ps->dev, pipe);
789 }
790                 
791
792 static int proc_getdriver(struct dev_state *ps, void __user *arg)
793 {
794         struct usbdevfs_getdriver gd;
795         struct usb_interface *intf;
796         int ret;
797
798         if (copy_from_user(&gd, arg, sizeof(gd)))
799                 return -EFAULT;
800         down_read(&usb_bus_type.subsys.rwsem);
801         intf = usb_ifnum_to_if(ps->dev, gd.interface);
802         if (!intf || !intf->dev.driver)
803                 ret = -ENODATA;
804         else {
805                 strncpy(gd.driver, intf->dev.driver->name,
806                                 sizeof(gd.driver));
807                 ret = (copy_to_user(arg, &gd, sizeof(gd)) ? -EFAULT : 0);
808         }
809         up_read(&usb_bus_type.subsys.rwsem);
810         return ret;
811 }
812
813 static int proc_connectinfo(struct dev_state *ps, void __user *arg)
814 {
815         struct usbdevfs_connectinfo ci;
816
817         ci.devnum = ps->dev->devnum;
818         ci.slow = ps->dev->speed == USB_SPEED_LOW;
819         if (copy_to_user(arg, &ci, sizeof(ci)))
820                 return -EFAULT;
821         return 0;
822 }
823
824 static int proc_resetdevice(struct dev_state *ps)
825 {
826         return usb_reset_device(ps->dev);
827
828 }
829
830 static int proc_setintf(struct dev_state *ps, void __user *arg)
831 {
832         struct usbdevfs_setinterface setintf;
833         int ret;
834
835         if (copy_from_user(&setintf, arg, sizeof(setintf)))
836                 return -EFAULT;
837         if ((ret = checkintf(ps, setintf.interface)))
838                 return ret;
839         return usb_set_interface(ps->dev, setintf.interface,
840                         setintf.altsetting);
841 }
842
843 static int proc_setconfig(struct dev_state *ps, void __user *arg)
844 {
845         unsigned int u;
846         int status = 0;
847         struct usb_host_config *actconfig;
848
849         if (get_user(u, (unsigned int __user *)arg))
850                 return -EFAULT;
851
852         actconfig = ps->dev->actconfig;
853  
854         /* Don't touch the device if any interfaces are claimed.
855          * It could interfere with other drivers' operations, and if
856          * an interface is claimed by usbfs it could easily deadlock.
857          */
858         if (actconfig) {
859                 int i;
860  
861                 for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) {
862                         if (usb_interface_claimed(actconfig->interface[i])) {
863                                 dev_warn (&ps->dev->dev,
864                                         "usbfs: interface %d claimed by %s "
865                                         "while '%s' sets config #%d\n",
866                                         actconfig->interface[i]
867                                                 ->cur_altsetting
868                                                 ->desc.bInterfaceNumber,
869                                         actconfig->interface[i]
870                                                 ->dev.driver->name,
871                                         current->comm, u);
872                                 status = -EBUSY;
873                                 break;
874                         }
875                 }
876         }
877
878         /* SET_CONFIGURATION is often abused as a "cheap" driver reset,
879          * so avoid usb_set_configuration()'s kick to sysfs
880          */
881         if (status == 0) {
882                 if (actconfig && actconfig->desc.bConfigurationValue == u)
883                         status = usb_reset_configuration(ps->dev);
884                 else
885                         status = usb_set_configuration(ps->dev, u);
886         }
887
888         return status;
889 }
890
891 static int proc_do_submiturb(struct dev_state *ps, struct usbdevfs_urb *uurb,
892                              struct usbdevfs_iso_packet_desc __user *iso_frame_desc,
893                              void __user *arg)
894 {
895         struct usbdevfs_iso_packet_desc *isopkt = NULL;
896         struct usb_host_endpoint *ep;
897         struct async *as;
898         struct usb_ctrlrequest *dr = NULL;
899         unsigned int u, totlen, isofrmlen;
900         int ret, interval = 0, ifnum = -1;
901
902         if (uurb->flags & ~(USBDEVFS_URB_ISO_ASAP|USBDEVFS_URB_SHORT_NOT_OK|
903                            URB_NO_FSBR|URB_ZERO_PACKET))
904                 return -EINVAL;
905         if (!uurb->buffer)
906                 return -EINVAL;
907         if (uurb->signr != 0 && (uurb->signr < SIGRTMIN || uurb->signr > SIGRTMAX))
908                 return -EINVAL;
909         if (!(uurb->type == USBDEVFS_URB_TYPE_CONTROL && (uurb->endpoint & ~USB_ENDPOINT_DIR_MASK) == 0)) {
910                 if ((ifnum = findintfep(ps->dev, uurb->endpoint)) < 0)
911                         return ifnum;
912                 if ((ret = checkintf(ps, ifnum)))
913                         return ret;
914         }
915         if ((uurb->endpoint & USB_ENDPOINT_DIR_MASK) != 0)
916                 ep = ps->dev->ep_in [uurb->endpoint & USB_ENDPOINT_NUMBER_MASK];
917         else
918                 ep = ps->dev->ep_out [uurb->endpoint & USB_ENDPOINT_NUMBER_MASK];
919         if (!ep)
920                 return -ENOENT;
921         switch(uurb->type) {
922         case USBDEVFS_URB_TYPE_CONTROL:
923                 if ((ep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
924                                 != USB_ENDPOINT_XFER_CONTROL)
925                         return -EINVAL;
926                 /* min 8 byte setup packet, max 8 byte setup plus an arbitrary data stage */
927                 if (uurb->buffer_length < 8 || uurb->buffer_length > (8 + MAX_USBFS_BUFFER_SIZE))
928                         return -EINVAL;
929                 if (!(dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL)))
930                         return -ENOMEM;
931                 if (copy_from_user(dr, uurb->buffer, 8)) {
932                         kfree(dr);
933                         return -EFAULT;
934                 }
935                 if (uurb->buffer_length < (le16_to_cpup(&dr->wLength) + 8)) {
936                         kfree(dr);
937                         return -EINVAL;
938                 }
939                 if ((ret = check_ctrlrecip(ps, dr->bRequestType, le16_to_cpup(&dr->wIndex)))) {
940                         kfree(dr);
941                         return ret;
942                 }
943                 uurb->endpoint = (uurb->endpoint & ~USB_ENDPOINT_DIR_MASK) | (dr->bRequestType & USB_ENDPOINT_DIR_MASK);
944                 uurb->number_of_packets = 0;
945                 uurb->buffer_length = le16_to_cpup(&dr->wLength);
946                 uurb->buffer += 8;
947                 if (!access_ok((uurb->endpoint & USB_DIR_IN) ?  VERIFY_WRITE : VERIFY_READ, uurb->buffer, uurb->buffer_length)) {
948                         kfree(dr);
949                         return -EFAULT;
950                 }
951                 snoop(&ps->dev->dev, "control urb\n");
952                 break;
953
954         case USBDEVFS_URB_TYPE_BULK:
955                 switch (ep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) {
956                 case USB_ENDPOINT_XFER_CONTROL:
957                 case USB_ENDPOINT_XFER_ISOC:
958                         return -EINVAL;
959                 /* allow single-shot interrupt transfers, at bogus rates */
960                 }
961                 uurb->number_of_packets = 0;
962                 if (uurb->buffer_length > MAX_USBFS_BUFFER_SIZE)
963                         return -EINVAL;
964                 if (!access_ok((uurb->endpoint & USB_DIR_IN) ? VERIFY_WRITE : VERIFY_READ, uurb->buffer, uurb->buffer_length))
965                         return -EFAULT;
966                 snoop(&ps->dev->dev, "bulk urb\n");
967                 break;
968
969         case USBDEVFS_URB_TYPE_ISO:
970                 /* arbitrary limit */
971                 if (uurb->number_of_packets < 1 || uurb->number_of_packets > 128)
972                         return -EINVAL;
973                 if ((ep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
974                                 != USB_ENDPOINT_XFER_ISOC)
975                         return -EINVAL;
976                 interval = 1 << min (15, ep->desc.bInterval - 1);
977                 isofrmlen = sizeof(struct usbdevfs_iso_packet_desc) * uurb->number_of_packets;
978                 if (!(isopkt = kmalloc(isofrmlen, GFP_KERNEL)))
979                         return -ENOMEM;
980                 if (copy_from_user(isopkt, iso_frame_desc, isofrmlen)) {
981                         kfree(isopkt);
982                         return -EFAULT;
983                 }
984                 for (totlen = u = 0; u < uurb->number_of_packets; u++) {
985                         /* arbitrary limit, sufficient for USB 2.0 high-bandwidth iso */
986                         if (isopkt[u].length > 8192) {
987                                 kfree(isopkt);
988                                 return -EINVAL;
989                         }
990                         totlen += isopkt[u].length;
991                 }
992                 if (totlen > 32768) {
993                         kfree(isopkt);
994                         return -EINVAL;
995                 }
996                 uurb->buffer_length = totlen;
997                 snoop(&ps->dev->dev, "iso urb\n");
998                 break;
999
1000         case USBDEVFS_URB_TYPE_INTERRUPT:
1001                 uurb->number_of_packets = 0;
1002                 if ((ep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
1003                                 != USB_ENDPOINT_XFER_INT)
1004                         return -EINVAL;
1005                 if (ps->dev->speed == USB_SPEED_HIGH)
1006                         interval = 1 << min (15, ep->desc.bInterval - 1);
1007                 else
1008                         interval = ep->desc.bInterval;
1009                 if (uurb->buffer_length > MAX_USBFS_BUFFER_SIZE)
1010                         return -EINVAL;
1011                 if (!access_ok((uurb->endpoint & USB_DIR_IN) ? VERIFY_WRITE : VERIFY_READ, uurb->buffer, uurb->buffer_length))
1012                         return -EFAULT;
1013                 snoop(&ps->dev->dev, "interrupt urb\n");
1014                 break;
1015
1016         default:
1017                 return -EINVAL;
1018         }
1019         if (!(as = alloc_async(uurb->number_of_packets))) {
1020                 kfree(isopkt);
1021                 kfree(dr);
1022                 return -ENOMEM;
1023         }
1024         if (!(as->urb->transfer_buffer = kmalloc(uurb->buffer_length, GFP_KERNEL))) {
1025                 kfree(isopkt);
1026                 kfree(dr);
1027                 free_async(as);
1028                 return -ENOMEM;
1029         }
1030         as->urb->dev = ps->dev;
1031         as->urb->pipe = (uurb->type << 30) | __create_pipe(ps->dev, uurb->endpoint & 0xf) | (uurb->endpoint & USB_DIR_IN);
1032         as->urb->transfer_flags = uurb->flags;
1033         as->urb->transfer_buffer_length = uurb->buffer_length;
1034         as->urb->setup_packet = (unsigned char*)dr;
1035         as->urb->start_frame = uurb->start_frame;
1036         as->urb->number_of_packets = uurb->number_of_packets;
1037         as->urb->interval = interval;
1038         as->urb->context = as;
1039         as->urb->complete = async_completed;
1040         for (totlen = u = 0; u < uurb->number_of_packets; u++) {
1041                 as->urb->iso_frame_desc[u].offset = totlen;
1042                 as->urb->iso_frame_desc[u].length = isopkt[u].length;
1043                 totlen += isopkt[u].length;
1044         }
1045         kfree(isopkt);
1046         as->ps = ps;
1047         as->userurb = arg;
1048         if (uurb->endpoint & USB_DIR_IN)
1049                 as->userbuffer = uurb->buffer;
1050         else
1051                 as->userbuffer = NULL;
1052         as->signr = uurb->signr;
1053         as->ifnum = ifnum;
1054         as->pid = current->pid;
1055         as->uid = current->uid;
1056         as->euid = current->euid;
1057         if (!(uurb->endpoint & USB_DIR_IN)) {
1058                 if (copy_from_user(as->urb->transfer_buffer, uurb->buffer, as->urb->transfer_buffer_length)) {
1059                         free_async(as);
1060                         return -EFAULT;
1061                 }
1062         }
1063         snoop(&as->urb->dev->dev, "submit urb\n");
1064         snoop_urb(as->urb, as->userurb);
1065         async_newpending(as);
1066         if ((ret = usb_submit_urb(as->urb, GFP_KERNEL))) {
1067                 dev_printk(KERN_DEBUG, &ps->dev->dev, "usbfs: usb_submit_urb returned %d\n", ret);
1068                 async_removepending(as);
1069                 free_async(as);
1070                 return ret;
1071         }
1072         return 0;
1073 }
1074
1075 static int proc_submiturb(struct dev_state *ps, void __user *arg)
1076 {
1077         struct usbdevfs_urb uurb;
1078
1079         if (copy_from_user(&uurb, arg, sizeof(uurb)))
1080                 return -EFAULT;
1081
1082         return proc_do_submiturb(ps, &uurb, (((struct usbdevfs_urb __user *)arg)->iso_frame_desc), arg);
1083 }
1084
1085 static int proc_unlinkurb(struct dev_state *ps, void __user *arg)
1086 {
1087         struct async *as;
1088
1089         as = async_getpending(ps, arg);
1090         if (!as)
1091                 return -EINVAL;
1092         usb_kill_urb(as->urb);
1093         return 0;
1094 }
1095
1096 static int processcompl(struct async *as, void __user * __user *arg)
1097 {
1098         struct urb *urb = as->urb;
1099         struct usbdevfs_urb __user *userurb = as->userurb;
1100         void __user *addr = as->userurb;
1101         unsigned int i;
1102
1103         if (as->userbuffer)
1104                 if (copy_to_user(as->userbuffer, urb->transfer_buffer, urb->transfer_buffer_length))
1105                         return -EFAULT;
1106         if (put_user(urb->status, &userurb->status))
1107                 return -EFAULT;
1108         if (put_user(urb->actual_length, &userurb->actual_length))
1109                 return -EFAULT;
1110         if (put_user(urb->error_count, &userurb->error_count))
1111                 return -EFAULT;
1112
1113         if (usb_pipeisoc(urb->pipe)) {
1114                 for (i = 0; i < urb->number_of_packets; i++) {
1115                         if (put_user(urb->iso_frame_desc[i].actual_length,
1116                                      &userurb->iso_frame_desc[i].actual_length))
1117                                 return -EFAULT;
1118                         if (put_user(urb->iso_frame_desc[i].status,
1119                                      &userurb->iso_frame_desc[i].status))
1120                                 return -EFAULT;
1121                 }
1122         }
1123
1124         free_async(as);
1125
1126         if (put_user(addr, (void __user * __user *)arg))
1127                 return -EFAULT;
1128         return 0;
1129 }
1130
1131 static struct async* reap_as(struct dev_state *ps)
1132 {
1133         DECLARE_WAITQUEUE(wait, current);
1134         struct async *as = NULL;
1135         struct usb_device *dev = ps->dev;
1136
1137         add_wait_queue(&ps->wait, &wait);
1138         for (;;) {
1139                 __set_current_state(TASK_INTERRUPTIBLE);
1140                 if ((as = async_getcompleted(ps)))
1141                         break;
1142                 if (signal_pending(current))
1143                         break;
1144                 usb_unlock_device(dev);
1145                 schedule();
1146                 usb_lock_device(dev);
1147         }
1148         remove_wait_queue(&ps->wait, &wait);
1149         set_current_state(TASK_RUNNING);
1150         return as;
1151 }
1152
1153 static int proc_reapurb(struct dev_state *ps, void __user *arg)
1154 {
1155         struct async *as = reap_as(ps);
1156         if (as)
1157                 return processcompl(as, (void __user * __user *)arg);
1158         if (signal_pending(current))
1159                 return -EINTR;
1160         return -EIO;
1161 }
1162
1163 static int proc_reapurbnonblock(struct dev_state *ps, void __user *arg)
1164 {
1165         struct async *as;
1166
1167         if (!(as = async_getcompleted(ps)))
1168                 return -EAGAIN;
1169         return processcompl(as, (void __user * __user *)arg);
1170 }
1171
1172 #ifdef CONFIG_COMPAT
1173
1174 static int get_urb32(struct usbdevfs_urb *kurb,
1175                      struct usbdevfs_urb32 __user *uurb)
1176 {
1177         __u32  uptr;
1178         if (get_user(kurb->type, &uurb->type) ||
1179             __get_user(kurb->endpoint, &uurb->endpoint) ||
1180             __get_user(kurb->status, &uurb->status) ||
1181             __get_user(kurb->flags, &uurb->flags) ||
1182             __get_user(kurb->buffer_length, &uurb->buffer_length) ||
1183             __get_user(kurb->actual_length, &uurb->actual_length) ||
1184             __get_user(kurb->start_frame, &uurb->start_frame) ||
1185             __get_user(kurb->number_of_packets, &uurb->number_of_packets) ||
1186             __get_user(kurb->error_count, &uurb->error_count) ||
1187             __get_user(kurb->signr, &uurb->signr))
1188                 return -EFAULT;
1189
1190         if (__get_user(uptr, &uurb->buffer))
1191                 return -EFAULT;
1192         kurb->buffer = compat_ptr(uptr);
1193         if (__get_user(uptr, &uurb->buffer))
1194                 return -EFAULT;
1195         kurb->usercontext = compat_ptr(uptr);
1196
1197         return 0;
1198 }
1199
1200 static int proc_submiturb_compat(struct dev_state *ps, void __user *arg)
1201 {
1202         struct usbdevfs_urb uurb;
1203
1204         if (get_urb32(&uurb,(struct usbdevfs_urb32 *)arg))
1205                 return -EFAULT;
1206
1207         return proc_do_submiturb(ps, &uurb, ((struct usbdevfs_urb32 __user *)arg)->iso_frame_desc, arg);
1208 }
1209
1210 static int processcompl_compat(struct async *as, void __user * __user *arg)
1211 {
1212         struct urb *urb = as->urb;
1213         struct usbdevfs_urb32 __user *userurb = as->userurb;
1214         void __user *addr = as->userurb;
1215         unsigned int i;
1216
1217         if (as->userbuffer)
1218                 if (copy_to_user(as->userbuffer, urb->transfer_buffer, urb->transfer_buffer_length))
1219                         return -EFAULT;
1220         if (put_user(urb->status, &userurb->status))
1221                 return -EFAULT;
1222         if (put_user(urb->actual_length, &userurb->actual_length))
1223                 return -EFAULT;
1224         if (put_user(urb->error_count, &userurb->error_count))
1225                 return -EFAULT;
1226
1227         if (usb_pipeisoc(urb->pipe)) {
1228                 for (i = 0; i < urb->number_of_packets; i++) {
1229                         if (put_user(urb->iso_frame_desc[i].actual_length,
1230                                      &userurb->iso_frame_desc[i].actual_length))
1231                                 return -EFAULT;
1232                         if (put_user(urb->iso_frame_desc[i].status,
1233                                      &userurb->iso_frame_desc[i].status))
1234                                 return -EFAULT;
1235                 }
1236         }
1237
1238         free_async(as);
1239         if (put_user((u32)(u64)addr, (u32 __user *)arg))
1240                 return -EFAULT;
1241         return 0;
1242 }
1243
1244 static int proc_reapurb_compat(struct dev_state *ps, void __user *arg)
1245 {
1246         struct async *as = reap_as(ps);
1247         if (as)
1248                 return processcompl_compat(as, (void __user * __user *)arg);
1249         if (signal_pending(current))
1250                 return -EINTR;
1251         return -EIO;
1252 }
1253
1254 static int proc_reapurbnonblock_compat(struct dev_state *ps, void __user *arg)
1255 {
1256         struct async *as;
1257
1258         if (!(as = async_getcompleted(ps)))
1259                 return -EAGAIN;
1260         return processcompl_compat(as, (void __user * __user *)arg);
1261 }
1262
1263 #endif
1264
1265 static int proc_disconnectsignal(struct dev_state *ps, void __user *arg)
1266 {
1267         struct usbdevfs_disconnectsignal ds;
1268
1269         if (copy_from_user(&ds, arg, sizeof(ds)))
1270                 return -EFAULT;
1271         if (ds.signr != 0 && (ds.signr < SIGRTMIN || ds.signr > SIGRTMAX))
1272                 return -EINVAL;
1273         ps->discsignr = ds.signr;
1274         ps->disccontext = ds.context;
1275         return 0;
1276 }
1277
1278 static int proc_claiminterface(struct dev_state *ps, void __user *arg)
1279 {
1280         unsigned int ifnum;
1281
1282         if (get_user(ifnum, (unsigned int __user *)arg))
1283                 return -EFAULT;
1284         return claimintf(ps, ifnum);
1285 }
1286
1287 static int proc_releaseinterface(struct dev_state *ps, void __user *arg)
1288 {
1289         unsigned int ifnum;
1290         int ret;
1291
1292         if (get_user(ifnum, (unsigned int __user *)arg))
1293                 return -EFAULT;
1294         if ((ret = releaseintf(ps, ifnum)) < 0)
1295                 return ret;
1296         destroy_async_on_interface (ps, ifnum);
1297         return 0;
1298 }
1299
1300 static int proc_ioctl(struct dev_state *ps, struct usbdevfs_ioctl *ctl)
1301 {
1302         int                     size;
1303         void                    *buf = NULL;
1304         int                     retval = 0;
1305         struct usb_interface    *intf = NULL;
1306         struct usb_driver       *driver = NULL;
1307
1308         /* alloc buffer */
1309         if ((size = _IOC_SIZE (ctl->ioctl_code)) > 0) {
1310                 if ((buf = kmalloc (size, GFP_KERNEL)) == NULL)
1311                         return -ENOMEM;
1312                 if ((_IOC_DIR(ctl->ioctl_code) & _IOC_WRITE)) {
1313                         if (copy_from_user (buf, ctl->data, size)) {
1314                                 kfree(buf);
1315                                 return -EFAULT;
1316                         }
1317                 } else {
1318                         memset (buf, 0, size);
1319                 }
1320         }
1321
1322         if (!connected(ps->dev)) {
1323                 kfree(buf);
1324                 return -ENODEV;
1325         }
1326
1327         if (ps->dev->state != USB_STATE_CONFIGURED)
1328                 retval = -EHOSTUNREACH;
1329         else if (!(intf = usb_ifnum_to_if (ps->dev, ctl->ifno)))
1330                retval = -EINVAL;
1331         else switch (ctl->ioctl_code) {
1332
1333         /* disconnect kernel driver from interface */
1334         case USBDEVFS_DISCONNECT:
1335
1336                 down_write(&usb_bus_type.subsys.rwsem);
1337                 if (intf->dev.driver) {
1338                         driver = to_usb_driver(intf->dev.driver);
1339                         dev_dbg (&intf->dev, "disconnect by usbfs\n");
1340                         usb_driver_release_interface(driver, intf);
1341                 } else
1342                         retval = -ENODATA;
1343                 up_write(&usb_bus_type.subsys.rwsem);
1344                 break;
1345
1346         /* let kernel drivers try to (re)bind to the interface */
1347         case USBDEVFS_CONNECT:
1348                 usb_unlock_device(ps->dev);
1349                 bus_rescan_devices(intf->dev.bus);
1350                 usb_lock_device(ps->dev);
1351                 break;
1352
1353         /* talk directly to the interface's driver */
1354         default:
1355                 down_read(&usb_bus_type.subsys.rwsem);
1356                 if (intf->dev.driver)
1357                         driver = to_usb_driver(intf->dev.driver);
1358                 if (driver == NULL || driver->ioctl == NULL) {
1359                         retval = -ENOTTY;
1360                 } else {
1361                         retval = driver->ioctl (intf, ctl->ioctl_code, buf);
1362                         if (retval == -ENOIOCTLCMD)
1363                                 retval = -ENOTTY;
1364                 }
1365                 up_read(&usb_bus_type.subsys.rwsem);
1366         }
1367
1368         /* cleanup and return */
1369         if (retval >= 0
1370                         && (_IOC_DIR (ctl->ioctl_code) & _IOC_READ) != 0
1371                         && size > 0
1372                         && copy_to_user (ctl->data, buf, size) != 0)
1373                 retval = -EFAULT;
1374
1375         kfree(buf);
1376         return retval;
1377 }
1378
1379 static int proc_ioctl_default(struct dev_state *ps, void __user *arg)
1380 {
1381         struct usbdevfs_ioctl   ctrl;
1382
1383         if (copy_from_user(&ctrl, arg, sizeof (ctrl)))
1384                 return -EFAULT;
1385         return proc_ioctl(ps, &ctrl);
1386 }
1387
1388 #ifdef CONFIG_COMPAT
1389 static int proc_ioctl_compat(struct dev_state *ps, compat_uptr_t arg)
1390 {
1391         struct usbdevfs_ioctl32 __user *uioc;
1392         struct usbdevfs_ioctl ctrl;
1393         u32 udata;
1394
1395         uioc = compat_ptr((long)arg);
1396         if (get_user(ctrl.ifno, &uioc->ifno) ||
1397             get_user(ctrl.ioctl_code, &uioc->ioctl_code) ||
1398             __get_user(udata, &uioc->data))
1399                 return -EFAULT;
1400         ctrl.data = compat_ptr(udata);
1401
1402         return proc_ioctl(ps, &ctrl);
1403 }
1404 #endif
1405
1406 /*
1407  * NOTE:  All requests here that have interface numbers as parameters
1408  * are assuming that somehow the configuration has been prevented from
1409  * changing.  But there's no mechanism to ensure that...
1410  */
1411 static int usbdev_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
1412 {
1413         struct dev_state *ps = (struct dev_state *)file->private_data;
1414         struct usb_device *dev = ps->dev;
1415         void __user *p = (void __user *)arg;
1416         int ret = -ENOTTY;
1417
1418         if (!(file->f_mode & FMODE_WRITE))
1419                 return -EPERM;
1420         usb_lock_device(dev);
1421         if (!connected(dev)) {
1422                 usb_unlock_device(dev);
1423                 return -ENODEV;
1424         }
1425
1426         switch (cmd) {
1427         case USBDEVFS_CONTROL:
1428                 snoop(&dev->dev, "%s: CONTROL\n", __FUNCTION__);
1429                 ret = proc_control(ps, p);
1430                 if (ret >= 0)
1431                         inode->i_mtime = CURRENT_TIME;
1432                 break;
1433
1434         case USBDEVFS_BULK:
1435                 snoop(&dev->dev, "%s: BULK\n", __FUNCTION__);
1436                 ret = proc_bulk(ps, p);
1437                 if (ret >= 0)
1438                         inode->i_mtime = CURRENT_TIME;
1439                 break;
1440
1441         case USBDEVFS_RESETEP:
1442                 snoop(&dev->dev, "%s: RESETEP\n", __FUNCTION__);
1443                 ret = proc_resetep(ps, p);
1444                 if (ret >= 0)
1445                         inode->i_mtime = CURRENT_TIME;
1446                 break;
1447
1448         case USBDEVFS_RESET:
1449                 snoop(&dev->dev, "%s: RESET\n", __FUNCTION__);
1450                 ret = proc_resetdevice(ps);
1451                 break;
1452
1453         case USBDEVFS_CLEAR_HALT:
1454                 snoop(&dev->dev, "%s: CLEAR_HALT\n", __FUNCTION__);
1455                 ret = proc_clearhalt(ps, p);
1456                 if (ret >= 0)
1457                         inode->i_mtime = CURRENT_TIME;
1458                 break;
1459
1460         case USBDEVFS_GETDRIVER:
1461                 snoop(&dev->dev, "%s: GETDRIVER\n", __FUNCTION__);
1462                 ret = proc_getdriver(ps, p);
1463                 break;
1464
1465         case USBDEVFS_CONNECTINFO:
1466                 snoop(&dev->dev, "%s: CONNECTINFO\n", __FUNCTION__);
1467                 ret = proc_connectinfo(ps, p);
1468                 break;
1469
1470         case USBDEVFS_SETINTERFACE:
1471                 snoop(&dev->dev, "%s: SETINTERFACE\n", __FUNCTION__);
1472                 ret = proc_setintf(ps, p);
1473                 break;
1474
1475         case USBDEVFS_SETCONFIGURATION:
1476                 snoop(&dev->dev, "%s: SETCONFIGURATION\n", __FUNCTION__);
1477                 ret = proc_setconfig(ps, p);
1478                 break;
1479
1480         case USBDEVFS_SUBMITURB:
1481                 snoop(&dev->dev, "%s: SUBMITURB\n", __FUNCTION__);
1482                 ret = proc_submiturb(ps, p);
1483                 if (ret >= 0)
1484                         inode->i_mtime = CURRENT_TIME;
1485                 break;
1486
1487 #ifdef CONFIG_COMPAT
1488
1489         case USBDEVFS_SUBMITURB32:
1490                 snoop(&dev->dev, "%s: SUBMITURB32\n", __FUNCTION__);
1491                 ret = proc_submiturb_compat(ps, p);
1492                 if (ret >= 0)
1493                         inode->i_mtime = CURRENT_TIME;
1494                 break;
1495
1496         case USBDEVFS_REAPURB32:
1497                 snoop(&dev->dev, "%s: REAPURB32\n", __FUNCTION__);
1498                 ret = proc_reapurb_compat(ps, p);
1499                 break;
1500
1501         case USBDEVFS_REAPURBNDELAY32:
1502                 snoop(&dev->dev, "%s: REAPURBDELAY32\n", __FUNCTION__);
1503                 ret = proc_reapurbnonblock_compat(ps, p);
1504                 break;
1505
1506         case USBDEVFS_IOCTL32:
1507                 snoop(&dev->dev, "%s: IOCTL\n", __FUNCTION__);
1508                 ret = proc_ioctl_compat(ps, (compat_uptr_t)(long)p);
1509                 break;
1510 #endif
1511
1512         case USBDEVFS_DISCARDURB:
1513                 snoop(&dev->dev, "%s: DISCARDURB\n", __FUNCTION__);
1514                 ret = proc_unlinkurb(ps, p);
1515                 break;
1516
1517         case USBDEVFS_REAPURB:
1518                 snoop(&dev->dev, "%s: REAPURB\n", __FUNCTION__);
1519                 ret = proc_reapurb(ps, p);
1520                 break;
1521
1522         case USBDEVFS_REAPURBNDELAY:
1523                 snoop(&dev->dev, "%s: REAPURBDELAY\n", __FUNCTION__);
1524                 ret = proc_reapurbnonblock(ps, p);
1525                 break;
1526
1527         case USBDEVFS_DISCSIGNAL:
1528                 snoop(&dev->dev, "%s: DISCSIGNAL\n", __FUNCTION__);
1529                 ret = proc_disconnectsignal(ps, p);
1530                 break;
1531
1532         case USBDEVFS_CLAIMINTERFACE:
1533                 snoop(&dev->dev, "%s: CLAIMINTERFACE\n", __FUNCTION__);
1534                 ret = proc_claiminterface(ps, p);
1535                 break;
1536
1537         case USBDEVFS_RELEASEINTERFACE:
1538                 snoop(&dev->dev, "%s: RELEASEINTERFACE\n", __FUNCTION__);
1539                 ret = proc_releaseinterface(ps, p);
1540                 break;
1541
1542         case USBDEVFS_IOCTL:
1543                 snoop(&dev->dev, "%s: IOCTL\n", __FUNCTION__);
1544                 ret = proc_ioctl_default(ps, p);
1545                 break;
1546         }
1547         usb_unlock_device(dev);
1548         if (ret >= 0)
1549                 inode->i_atime = CURRENT_TIME;
1550         return ret;
1551 }
1552
1553 /* No kernel lock - fine */
1554 static unsigned int usbdev_poll(struct file *file, struct poll_table_struct *wait)
1555 {
1556         struct dev_state *ps = (struct dev_state *)file->private_data;
1557         unsigned int mask = 0;
1558
1559         poll_wait(file, &ps->wait, wait);
1560         if (file->f_mode & FMODE_WRITE && !list_empty(&ps->async_completed))
1561                 mask |= POLLOUT | POLLWRNORM;
1562         if (!connected(ps->dev))
1563                 mask |= POLLERR | POLLHUP;
1564         return mask;
1565 }
1566
1567 struct file_operations usbfs_device_file_operations = {
1568         .llseek =       usbdev_lseek,
1569         .read =         usbdev_read,
1570         .poll =         usbdev_poll,
1571         .ioctl =        usbdev_ioctl,
1572         .open =         usbdev_open,
1573         .release =      usbdev_release,
1574 };
1575
1576 static void usbdev_add(struct usb_device *dev)
1577 {
1578         int minor = ((dev->bus->busnum-1) * 128) + (dev->devnum-1);
1579
1580         dev->class_dev = class_device_create(usb_device_class, NULL,
1581                                 MKDEV(USB_DEVICE_MAJOR, minor), &dev->dev,
1582                                 "usbdev%d.%d", dev->bus->busnum, dev->devnum);
1583
1584         dev->class_dev->class_data = dev;
1585 }
1586
1587 static void usbdev_remove(struct usb_device *dev)
1588 {
1589         class_device_unregister(dev->class_dev);
1590 }
1591
1592 static int usbdev_notify(struct notifier_block *self, unsigned long action,
1593                          void *dev)
1594 {
1595         switch (action) {
1596         case USB_DEVICE_ADD:
1597                 usbdev_add(dev);
1598                 break;
1599         case USB_DEVICE_REMOVE:
1600                 usbdev_remove(dev);
1601                 break;
1602         }
1603         return NOTIFY_OK;
1604 }
1605
1606 static struct notifier_block usbdev_nb = {
1607         .notifier_call =        usbdev_notify,
1608 };
1609
1610 static struct cdev usb_device_cdev = {
1611         .kobj   = {.name = "usb_device", },
1612         .owner  = THIS_MODULE,
1613 };
1614
1615 int __init usbdev_init(void)
1616 {
1617         int retval;
1618
1619         retval = register_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX,
1620                         "usb_device");
1621         if (retval) {
1622                 err("unable to register minors for usb_device");
1623                 goto out;
1624         }
1625         cdev_init(&usb_device_cdev, &usbfs_device_file_operations);
1626         retval = cdev_add(&usb_device_cdev, USB_DEVICE_DEV, USB_DEVICE_MAX);
1627         if (retval) {
1628                 err("unable to get usb_device major %d", USB_DEVICE_MAJOR);
1629                 goto error_cdev;
1630         }
1631         usb_device_class = class_create(THIS_MODULE, "usb_device");
1632         if (IS_ERR(usb_device_class)) {
1633                 err("unable to register usb_device class");
1634                 retval = PTR_ERR(usb_device_class);
1635                 goto error_class;
1636         }
1637
1638         usb_register_notify(&usbdev_nb);
1639
1640 out:
1641         return retval;
1642
1643 error_class:
1644         usb_device_class = NULL;
1645         cdev_del(&usb_device_cdev);
1646
1647 error_cdev:
1648         unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
1649         goto out;
1650 }
1651
1652 void usbdev_cleanup(void)
1653 {
1654         usb_unregister_notify(&usbdev_nb);
1655         class_destroy(usb_device_class);
1656         cdev_del(&usb_device_cdev);
1657         unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
1658 }
1659