USB: Make file operations structs in drivers/usb const.
[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 dev_state *ps)
94 {
95         return (!list_empty(&ps->list) &&
96                         ps->dev->state != USB_STATE_NOTATTACHED);
97 }
98
99 static loff_t usbdev_lseek(struct file *file, loff_t offset, int orig)
100 {
101         loff_t ret;
102
103         lock_kernel();
104
105         switch (orig) {
106         case 0:
107                 file->f_pos = offset;
108                 ret = file->f_pos;
109                 break;
110         case 1:
111                 file->f_pos += offset;
112                 ret = file->f_pos;
113                 break;
114         case 2:
115         default:
116                 ret = -EINVAL;
117         }
118
119         unlock_kernel();
120         return ret;
121 }
122
123 static ssize_t usbdev_read(struct file *file, char __user *buf, size_t nbytes, loff_t *ppos)
124 {
125         struct dev_state *ps = (struct dev_state *)file->private_data;
126         struct usb_device *dev = ps->dev;
127         ssize_t ret = 0;
128         unsigned len;
129         loff_t pos;
130         int i;
131
132         pos = *ppos;
133         usb_lock_device(dev);
134         if (!connected(ps)) {
135                 ret = -ENODEV;
136                 goto err;
137         } else if (pos < 0) {
138                 ret = -EINVAL;
139                 goto err;
140         }
141
142         if (pos < sizeof(struct usb_device_descriptor)) {
143                 struct usb_device_descriptor temp_desc ; /* 18 bytes - fits on the stack */
144
145                 memcpy(&temp_desc, &dev->descriptor, sizeof(dev->descriptor));
146                 le16_to_cpus(&temp_desc.bcdUSB);
147                 le16_to_cpus(&temp_desc.idVendor);
148                 le16_to_cpus(&temp_desc.idProduct);
149                 le16_to_cpus(&temp_desc.bcdDevice);
150
151                 len = sizeof(struct usb_device_descriptor) - pos;
152                 if (len > nbytes)
153                         len = nbytes;
154                 if (copy_to_user(buf, ((char *)&temp_desc) + pos, len)) {
155                         ret = -EFAULT;
156                         goto err;
157                 }
158
159                 *ppos += len;
160                 buf += len;
161                 nbytes -= len;
162                 ret += len;
163         }
164
165         pos = sizeof(struct usb_device_descriptor);
166         for (i = 0; nbytes && i < dev->descriptor.bNumConfigurations; i++) {
167                 struct usb_config_descriptor *config =
168                         (struct usb_config_descriptor *)dev->rawdescriptors[i];
169                 unsigned int length = le16_to_cpu(config->wTotalLength);
170
171                 if (*ppos < pos + length) {
172
173                         /* The descriptor may claim to be longer than it
174                          * really is.  Here is the actual allocated length. */
175                         unsigned alloclen =
176                                 le16_to_cpu(dev->config[i].desc.wTotalLength);
177
178                         len = length - (*ppos - pos);
179                         if (len > nbytes)
180                                 len = nbytes;
181
182                         /* Simply don't write (skip over) unallocated parts */
183                         if (alloclen > (*ppos - pos)) {
184                                 alloclen -= (*ppos - pos);
185                                 if (copy_to_user(buf,
186                                     dev->rawdescriptors[i] + (*ppos - pos),
187                                     min(len, alloclen))) {
188                                         ret = -EFAULT;
189                                         goto err;
190                                 }
191                         }
192
193                         *ppos += len;
194                         buf += len;
195                         nbytes -= len;
196                         ret += len;
197                 }
198
199                 pos += length;
200         }
201
202 err:
203         usb_unlock_device(dev);
204         return ret;
205 }
206
207 /*
208  * async list handling
209  */
210
211 static struct async *alloc_async(unsigned int numisoframes)
212 {
213         unsigned int assize = sizeof(struct async) + numisoframes * sizeof(struct usb_iso_packet_descriptor);
214         struct async *as = kzalloc(assize, GFP_KERNEL);
215
216         if (!as)
217                 return NULL;
218         as->urb = usb_alloc_urb(numisoframes, GFP_KERNEL);
219         if (!as->urb) {
220                 kfree(as);
221                 return NULL;
222         }
223         return as;
224 }
225
226 static void free_async(struct async *as)
227 {
228         kfree(as->urb->transfer_buffer);
229         kfree(as->urb->setup_packet);
230         usb_free_urb(as->urb);
231         kfree(as);
232 }
233
234 static inline void async_newpending(struct async *as)
235 {
236         struct dev_state *ps = as->ps;
237         unsigned long flags;
238         
239         spin_lock_irqsave(&ps->lock, flags);
240         list_add_tail(&as->asynclist, &ps->async_pending);
241         spin_unlock_irqrestore(&ps->lock, flags);
242 }
243
244 static inline void async_removepending(struct async *as)
245 {
246         struct dev_state *ps = as->ps;
247         unsigned long flags;
248         
249         spin_lock_irqsave(&ps->lock, flags);
250         list_del_init(&as->asynclist);
251         spin_unlock_irqrestore(&ps->lock, flags);
252 }
253
254 static inline struct async *async_getcompleted(struct dev_state *ps)
255 {
256         unsigned long flags;
257         struct async *as = NULL;
258
259         spin_lock_irqsave(&ps->lock, flags);
260         if (!list_empty(&ps->async_completed)) {
261                 as = list_entry(ps->async_completed.next, struct async, asynclist);
262                 list_del_init(&as->asynclist);
263         }
264         spin_unlock_irqrestore(&ps->lock, flags);
265         return as;
266 }
267
268 static inline struct async *async_getpending(struct dev_state *ps, void __user *userurb)
269 {
270         unsigned long flags;
271         struct async *as;
272
273         spin_lock_irqsave(&ps->lock, flags);
274         list_for_each_entry(as, &ps->async_pending, asynclist)
275                 if (as->userurb == userurb) {
276                         list_del_init(&as->asynclist);
277                         spin_unlock_irqrestore(&ps->lock, flags);
278                         return as;
279                 }
280         spin_unlock_irqrestore(&ps->lock, flags);
281         return NULL;
282 }
283
284 static void snoop_urb(struct urb *urb, void __user *userurb)
285 {
286         int j;
287         unsigned char *data = urb->transfer_buffer;
288
289         if (!usbfs_snoop)
290                 return;
291
292         if (urb->pipe & USB_DIR_IN)
293                 dev_info(&urb->dev->dev, "direction=IN\n");
294         else
295                 dev_info(&urb->dev->dev, "direction=OUT\n");
296         dev_info(&urb->dev->dev, "userurb=%p\n", userurb);
297         dev_info(&urb->dev->dev, "transfer_buffer_length=%d\n",
298                  urb->transfer_buffer_length);
299         dev_info(&urb->dev->dev, "actual_length=%d\n", urb->actual_length);
300         dev_info(&urb->dev->dev, "data: ");
301         for (j = 0; j < urb->transfer_buffer_length; ++j)
302                 printk ("%02x ", data[j]);
303         printk("\n");
304 }
305
306 static void async_completed(struct urb *urb, struct pt_regs *regs)
307 {
308         struct async *as = (struct async *)urb->context;
309         struct dev_state *ps = as->ps;
310         struct siginfo sinfo;
311
312         spin_lock(&ps->lock);
313         list_move_tail(&as->asynclist, &ps->async_completed);
314         spin_unlock(&ps->lock);
315         if (as->signr) {
316                 sinfo.si_signo = as->signr;
317                 sinfo.si_errno = as->urb->status;
318                 sinfo.si_code = SI_ASYNCIO;
319                 sinfo.si_addr = as->userurb;
320                 kill_proc_info_as_uid(as->signr, &sinfo, as->pid, as->uid, 
321                                       as->euid, as->secid);
322         }
323         snoop(&urb->dev->dev, "urb complete\n");
324         snoop_urb(urb, as->userurb);
325         wake_up(&ps->wait);
326 }
327
328 static void destroy_async (struct dev_state *ps, struct list_head *list)
329 {
330         struct async *as;
331         unsigned long flags;
332
333         spin_lock_irqsave(&ps->lock, flags);
334         while (!list_empty(list)) {
335                 as = list_entry(list->next, struct async, asynclist);
336                 list_del_init(&as->asynclist);
337
338                 /* drop the spinlock so the completion handler can run */
339                 spin_unlock_irqrestore(&ps->lock, flags);
340                 usb_kill_urb(as->urb);
341                 spin_lock_irqsave(&ps->lock, flags);
342         }
343         spin_unlock_irqrestore(&ps->lock, flags);
344         as = async_getcompleted(ps);
345         while (as) {
346                 free_async(as);
347                 as = async_getcompleted(ps);
348         }
349 }
350
351 static void destroy_async_on_interface (struct dev_state *ps, unsigned int ifnum)
352 {
353         struct list_head *p, *q, hitlist;
354         unsigned long flags;
355
356         INIT_LIST_HEAD(&hitlist);
357         spin_lock_irqsave(&ps->lock, flags);
358         list_for_each_safe(p, q, &ps->async_pending)
359                 if (ifnum == list_entry(p, struct async, asynclist)->ifnum)
360                         list_move_tail(p, &hitlist);
361         spin_unlock_irqrestore(&ps->lock, flags);
362         destroy_async(ps, &hitlist);
363 }
364
365 static inline void destroy_all_async(struct dev_state *ps)
366 {
367                 destroy_async(ps, &ps->async_pending);
368 }
369
370 /*
371  * interface claims are made only at the request of user level code,
372  * which can also release them (explicitly or by closing files).
373  * they're also undone when devices disconnect.
374  */
375
376 static int driver_probe (struct usb_interface *intf,
377                          const struct usb_device_id *id)
378 {
379         return -ENODEV;
380 }
381
382 static void driver_disconnect(struct usb_interface *intf)
383 {
384         struct dev_state *ps = usb_get_intfdata (intf);
385         unsigned int ifnum = intf->altsetting->desc.bInterfaceNumber;
386
387         if (!ps)
388                 return;
389
390         /* NOTE:  this relies on usbcore having canceled and completed
391          * all pending I/O requests; 2.6 does that.
392          */
393
394         if (likely(ifnum < 8*sizeof(ps->ifclaimed)))
395                 clear_bit(ifnum, &ps->ifclaimed);
396         else
397                 warn("interface number %u out of range", ifnum);
398
399         usb_set_intfdata (intf, NULL);
400
401         /* force async requests to complete */
402         destroy_async_on_interface(ps, ifnum);
403 }
404
405 struct usb_driver usbfs_driver = {
406         .name =         "usbfs",
407         .probe =        driver_probe,
408         .disconnect =   driver_disconnect,
409 };
410
411 static int claimintf(struct dev_state *ps, unsigned int ifnum)
412 {
413         struct usb_device *dev = ps->dev;
414         struct usb_interface *intf;
415         int err;
416
417         if (ifnum >= 8*sizeof(ps->ifclaimed))
418                 return -EINVAL;
419         /* already claimed */
420         if (test_bit(ifnum, &ps->ifclaimed))
421                 return 0;
422
423         /* lock against other changes to driver bindings */
424         down_write(&usb_bus_type.subsys.rwsem);
425         intf = usb_ifnum_to_if(dev, ifnum);
426         if (!intf)
427                 err = -ENOENT;
428         else
429                 err = usb_driver_claim_interface(&usbfs_driver, intf, ps);
430         up_write(&usb_bus_type.subsys.rwsem);
431         if (err == 0)
432                 set_bit(ifnum, &ps->ifclaimed);
433         return err;
434 }
435
436 static int releaseintf(struct dev_state *ps, unsigned int ifnum)
437 {
438         struct usb_device *dev;
439         struct usb_interface *intf;
440         int err;
441
442         err = -EINVAL;
443         if (ifnum >= 8*sizeof(ps->ifclaimed))
444                 return err;
445         dev = ps->dev;
446         /* lock against other changes to driver bindings */
447         down_write(&usb_bus_type.subsys.rwsem);
448         intf = usb_ifnum_to_if(dev, ifnum);
449         if (!intf)
450                 err = -ENOENT;
451         else if (test_and_clear_bit(ifnum, &ps->ifclaimed)) {
452                 usb_driver_release_interface(&usbfs_driver, intf);
453                 err = 0;
454         }
455         up_write(&usb_bus_type.subsys.rwsem);
456         return err;
457 }
458
459 static int checkintf(struct dev_state *ps, unsigned int ifnum)
460 {
461         if (ps->dev->state != USB_STATE_CONFIGURED)
462                 return -EHOSTUNREACH;
463         if (ifnum >= 8*sizeof(ps->ifclaimed))
464                 return -EINVAL;
465         if (test_bit(ifnum, &ps->ifclaimed))
466                 return 0;
467         /* if not yet claimed, claim it for the driver */
468         dev_warn(&ps->dev->dev, "usbfs: process %d (%s) did not claim interface %u before use\n",
469                current->pid, current->comm, ifnum);
470         return claimintf(ps, ifnum);
471 }
472
473 static int findintfep(struct usb_device *dev, unsigned int ep)
474 {
475         unsigned int i, j, e;
476         struct usb_interface *intf;
477         struct usb_host_interface *alts;
478         struct usb_endpoint_descriptor *endpt;
479
480         if (ep & ~(USB_DIR_IN|0xf))
481                 return -EINVAL;
482         if (!dev->actconfig)
483                 return -ESRCH;
484         for (i = 0; i < dev->actconfig->desc.bNumInterfaces; i++) {
485                 intf = dev->actconfig->interface[i];
486                 for (j = 0; j < intf->num_altsetting; j++) {
487                         alts = &intf->altsetting[j];
488                         for (e = 0; e < alts->desc.bNumEndpoints; e++) {
489                                 endpt = &alts->endpoint[e].desc;
490                                 if (endpt->bEndpointAddress == ep)
491                                         return alts->desc.bInterfaceNumber;
492                         }
493                 }
494         }
495         return -ENOENT; 
496 }
497
498 static int check_ctrlrecip(struct dev_state *ps, unsigned int requesttype, unsigned int index)
499 {
500         int ret = 0;
501
502         if (ps->dev->state != USB_STATE_ADDRESS
503          && ps->dev->state != USB_STATE_CONFIGURED)
504                 return -EHOSTUNREACH;
505         if (USB_TYPE_VENDOR == (USB_TYPE_MASK & requesttype))
506                 return 0;
507
508         index &= 0xff;
509         switch (requesttype & USB_RECIP_MASK) {
510         case USB_RECIP_ENDPOINT:
511                 if ((ret = findintfep(ps->dev, index)) >= 0)
512                         ret = checkintf(ps, ret);
513                 break;
514
515         case USB_RECIP_INTERFACE:
516                 ret = checkintf(ps, index);
517                 break;
518         }
519         return ret;
520 }
521
522 static struct usb_device *usbdev_lookup_minor(int minor)
523 {
524         struct class_device *class_dev;
525         struct usb_device *dev = NULL;
526
527         down(&usb_device_class->sem);
528         list_for_each_entry(class_dev, &usb_device_class->children, node) {
529                 if (class_dev->devt == MKDEV(USB_DEVICE_MAJOR, minor)) {
530                         dev = class_dev->class_data;
531                         break;
532                 }
533         }
534         up(&usb_device_class->sem);
535
536         return dev;
537 };
538
539 /*
540  * file operations
541  */
542 static int usbdev_open(struct inode *inode, struct file *file)
543 {
544         struct usb_device *dev = NULL;
545         struct dev_state *ps;
546         int ret;
547
548         /* Protect against simultaneous removal or release */
549         mutex_lock(&usbfs_mutex);
550
551         ret = -ENOMEM;
552         if (!(ps = kmalloc(sizeof(struct dev_state), GFP_KERNEL)))
553                 goto out;
554
555         ret = -ENOENT;
556         /* check if we are called from a real node or usbfs */
557         if (imajor(inode) == USB_DEVICE_MAJOR)
558                 dev = usbdev_lookup_minor(iminor(inode));
559         if (!dev)
560                 dev = inode->i_private;
561         if (!dev) {
562                 kfree(ps);
563                 goto out;
564         }
565         usb_get_dev(dev);
566         ret = 0;
567         ps->dev = dev;
568         ps->file = file;
569         spin_lock_init(&ps->lock);
570         INIT_LIST_HEAD(&ps->async_pending);
571         INIT_LIST_HEAD(&ps->async_completed);
572         init_waitqueue_head(&ps->wait);
573         ps->discsignr = 0;
574         ps->disc_pid = current->pid;
575         ps->disc_uid = current->uid;
576         ps->disc_euid = current->euid;
577         ps->disccontext = NULL;
578         ps->ifclaimed = 0;
579         security_task_getsecid(current, &ps->secid);
580         wmb();
581         list_add_tail(&ps->list, &dev->filelist);
582         file->private_data = ps;
583  out:
584         mutex_unlock(&usbfs_mutex);
585         return ret;
586 }
587
588 static int usbdev_release(struct inode *inode, struct file *file)
589 {
590         struct dev_state *ps = (struct dev_state *)file->private_data;
591         struct usb_device *dev = ps->dev;
592         unsigned int ifnum;
593
594         usb_lock_device(dev);
595
596         /* Protect against simultaneous open */
597         mutex_lock(&usbfs_mutex);
598         list_del_init(&ps->list);
599         mutex_unlock(&usbfs_mutex);
600
601         for (ifnum = 0; ps->ifclaimed && ifnum < 8*sizeof(ps->ifclaimed);
602                         ifnum++) {
603                 if (test_bit(ifnum, &ps->ifclaimed))
604                         releaseintf(ps, ifnum);
605         }
606         destroy_all_async(ps);
607         usb_unlock_device(dev);
608         usb_put_dev(dev);
609         kfree(ps);
610         return 0;
611 }
612
613 static int proc_control(struct dev_state *ps, void __user *arg)
614 {
615         struct usb_device *dev = ps->dev;
616         struct usbdevfs_ctrltransfer ctrl;
617         unsigned int tmo;
618         unsigned char *tbuf;
619         int i, j, ret;
620
621         if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
622                 return -EFAULT;
623         if ((ret = check_ctrlrecip(ps, ctrl.bRequestType, ctrl.wIndex)))
624                 return ret;
625         if (ctrl.wLength > PAGE_SIZE)
626                 return -EINVAL;
627         if (!(tbuf = (unsigned char *)__get_free_page(GFP_KERNEL)))
628                 return -ENOMEM;
629         tmo = ctrl.timeout;
630         if (ctrl.bRequestType & 0x80) {
631                 if (ctrl.wLength && !access_ok(VERIFY_WRITE, ctrl.data, ctrl.wLength)) {
632                         free_page((unsigned long)tbuf);
633                         return -EINVAL;
634                 }
635                 snoop(&dev->dev, "control read: bRequest=%02x "
636                                 "bRrequestType=%02x wValue=%04x "
637                                 "wIndex=%04x wLength=%04x\n",
638                         ctrl.bRequest, ctrl.bRequestType, ctrl.wValue,
639                                 ctrl.wIndex, ctrl.wLength);
640
641                 usb_unlock_device(dev);
642                 i = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), ctrl.bRequest, ctrl.bRequestType,
643                                        ctrl.wValue, ctrl.wIndex, tbuf, ctrl.wLength, tmo);
644                 usb_lock_device(dev);
645                 if ((i > 0) && ctrl.wLength) {
646                         if (usbfs_snoop) {
647                                 dev_info(&dev->dev, "control read: data ");
648                                 for (j = 0; j < i; ++j)
649                                         printk("%02x ", (unsigned char)(tbuf)[j]);
650                                 printk("\n");
651                         }
652                         if (copy_to_user(ctrl.data, tbuf, i)) {
653                                 free_page((unsigned long)tbuf);
654                                 return -EFAULT;
655                         }
656                 }
657         } else {
658                 if (ctrl.wLength) {
659                         if (copy_from_user(tbuf, ctrl.data, ctrl.wLength)) {
660                                 free_page((unsigned long)tbuf);
661                                 return -EFAULT;
662                         }
663                 }
664                 snoop(&dev->dev, "control write: bRequest=%02x "
665                                 "bRrequestType=%02x wValue=%04x "
666                                 "wIndex=%04x wLength=%04x\n",
667                         ctrl.bRequest, ctrl.bRequestType, ctrl.wValue,
668                                 ctrl.wIndex, ctrl.wLength);
669                 if (usbfs_snoop) {
670                         dev_info(&dev->dev, "control write: data: ");
671                         for (j = 0; j < ctrl.wLength; ++j)
672                                 printk("%02x ", (unsigned char)(tbuf)[j]);
673                         printk("\n");
674                 }
675                 usb_unlock_device(dev);
676                 i = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), ctrl.bRequest, ctrl.bRequestType,
677                                        ctrl.wValue, ctrl.wIndex, tbuf, ctrl.wLength, tmo);
678                 usb_lock_device(dev);
679         }
680         free_page((unsigned long)tbuf);
681         if (i<0 && i != -EPIPE) {
682                 dev_printk(KERN_DEBUG, &dev->dev, "usbfs: USBDEVFS_CONTROL "
683                            "failed cmd %s rqt %u rq %u len %u ret %d\n",
684                            current->comm, ctrl.bRequestType, ctrl.bRequest,
685                            ctrl.wLength, i);
686         }
687         return i;
688 }
689
690 static int proc_bulk(struct dev_state *ps, void __user *arg)
691 {
692         struct usb_device *dev = ps->dev;
693         struct usbdevfs_bulktransfer bulk;
694         unsigned int tmo, len1, pipe;
695         int len2;
696         unsigned char *tbuf;
697         int i, j, ret;
698
699         if (copy_from_user(&bulk, arg, sizeof(bulk)))
700                 return -EFAULT;
701         if ((ret = findintfep(ps->dev, bulk.ep)) < 0)
702                 return ret;
703         if ((ret = checkintf(ps, ret)))
704                 return ret;
705         if (bulk.ep & USB_DIR_IN)
706                 pipe = usb_rcvbulkpipe(dev, bulk.ep & 0x7f);
707         else
708                 pipe = usb_sndbulkpipe(dev, bulk.ep & 0x7f);
709         if (!usb_maxpacket(dev, pipe, !(bulk.ep & USB_DIR_IN)))
710                 return -EINVAL;
711         len1 = bulk.len;
712         if (len1 > MAX_USBFS_BUFFER_SIZE)
713                 return -EINVAL;
714         if (!(tbuf = kmalloc(len1, GFP_KERNEL)))
715                 return -ENOMEM;
716         tmo = bulk.timeout;
717         if (bulk.ep & 0x80) {
718                 if (len1 && !access_ok(VERIFY_WRITE, bulk.data, len1)) {
719                         kfree(tbuf);
720                         return -EINVAL;
721                 }
722                 snoop(&dev->dev, "bulk read: len=0x%02x timeout=%04d\n",
723                         bulk.len, bulk.timeout);
724                 usb_unlock_device(dev);
725                 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
726                 usb_lock_device(dev);
727                 if (!i && len2) {
728                         if (usbfs_snoop) {
729                                 dev_info(&dev->dev, "bulk read: data ");
730                                 for (j = 0; j < len2; ++j)
731                                         printk("%02x ", (unsigned char)(tbuf)[j]);
732                                 printk("\n");
733                         }
734                         if (copy_to_user(bulk.data, tbuf, len2)) {
735                                 kfree(tbuf);
736                                 return -EFAULT;
737                         }
738                 }
739         } else {
740                 if (len1) {
741                         if (copy_from_user(tbuf, bulk.data, len1)) {
742                                 kfree(tbuf);
743                                 return -EFAULT;
744                         }
745                 }
746                 snoop(&dev->dev, "bulk write: len=0x%02x timeout=%04d\n",
747                         bulk.len, bulk.timeout);
748                 if (usbfs_snoop) {
749                         dev_info(&dev->dev, "bulk write: data: ");
750                         for (j = 0; j < len1; ++j)
751                                 printk("%02x ", (unsigned char)(tbuf)[j]);
752                         printk("\n");
753                 }
754                 usb_unlock_device(dev);
755                 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
756                 usb_lock_device(dev);
757         }
758         kfree(tbuf);
759         if (i < 0)
760                 return i;
761         return len2;
762 }
763
764 static int proc_resetep(struct dev_state *ps, void __user *arg)
765 {
766         unsigned int ep;
767         int ret;
768
769         if (get_user(ep, (unsigned int __user *)arg))
770                 return -EFAULT;
771         if ((ret = findintfep(ps->dev, ep)) < 0)
772                 return ret;
773         if ((ret = checkintf(ps, ret)))
774                 return ret;
775         usb_settoggle(ps->dev, ep & 0xf, !(ep & USB_DIR_IN), 0);
776         return 0;
777 }
778
779 static int proc_clearhalt(struct dev_state *ps, void __user *arg)
780 {
781         unsigned int ep;
782         int pipe;
783         int ret;
784
785         if (get_user(ep, (unsigned int __user *)arg))
786                 return -EFAULT;
787         if ((ret = findintfep(ps->dev, ep)) < 0)
788                 return ret;
789         if ((ret = checkintf(ps, ret)))
790                 return ret;
791         if (ep & USB_DIR_IN)
792                 pipe = usb_rcvbulkpipe(ps->dev, ep & 0x7f);
793         else
794                 pipe = usb_sndbulkpipe(ps->dev, ep & 0x7f);
795
796         return usb_clear_halt(ps->dev, pipe);
797 }
798                 
799
800 static int proc_getdriver(struct dev_state *ps, void __user *arg)
801 {
802         struct usbdevfs_getdriver gd;
803         struct usb_interface *intf;
804         int ret;
805
806         if (copy_from_user(&gd, arg, sizeof(gd)))
807                 return -EFAULT;
808         down_read(&usb_bus_type.subsys.rwsem);
809         intf = usb_ifnum_to_if(ps->dev, gd.interface);
810         if (!intf || !intf->dev.driver)
811                 ret = -ENODATA;
812         else {
813                 strncpy(gd.driver, intf->dev.driver->name,
814                                 sizeof(gd.driver));
815                 ret = (copy_to_user(arg, &gd, sizeof(gd)) ? -EFAULT : 0);
816         }
817         up_read(&usb_bus_type.subsys.rwsem);
818         return ret;
819 }
820
821 static int proc_connectinfo(struct dev_state *ps, void __user *arg)
822 {
823         struct usbdevfs_connectinfo ci;
824
825         ci.devnum = ps->dev->devnum;
826         ci.slow = ps->dev->speed == USB_SPEED_LOW;
827         if (copy_to_user(arg, &ci, sizeof(ci)))
828                 return -EFAULT;
829         return 0;
830 }
831
832 static int proc_resetdevice(struct dev_state *ps)
833 {
834         return usb_reset_composite_device(ps->dev, NULL);
835 }
836
837 static int proc_setintf(struct dev_state *ps, void __user *arg)
838 {
839         struct usbdevfs_setinterface setintf;
840         int ret;
841
842         if (copy_from_user(&setintf, arg, sizeof(setintf)))
843                 return -EFAULT;
844         if ((ret = checkintf(ps, setintf.interface)))
845                 return ret;
846         return usb_set_interface(ps->dev, setintf.interface,
847                         setintf.altsetting);
848 }
849
850 static int proc_setconfig(struct dev_state *ps, void __user *arg)
851 {
852         unsigned int u;
853         int status = 0;
854         struct usb_host_config *actconfig;
855
856         if (get_user(u, (unsigned int __user *)arg))
857                 return -EFAULT;
858
859         actconfig = ps->dev->actconfig;
860  
861         /* Don't touch the device if any interfaces are claimed.
862          * It could interfere with other drivers' operations, and if
863          * an interface is claimed by usbfs it could easily deadlock.
864          */
865         if (actconfig) {
866                 int i;
867  
868                 for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) {
869                         if (usb_interface_claimed(actconfig->interface[i])) {
870                                 dev_warn (&ps->dev->dev,
871                                         "usbfs: interface %d claimed by %s "
872                                         "while '%s' sets config #%d\n",
873                                         actconfig->interface[i]
874                                                 ->cur_altsetting
875                                                 ->desc.bInterfaceNumber,
876                                         actconfig->interface[i]
877                                                 ->dev.driver->name,
878                                         current->comm, u);
879                                 status = -EBUSY;
880                                 break;
881                         }
882                 }
883         }
884
885         /* SET_CONFIGURATION is often abused as a "cheap" driver reset,
886          * so avoid usb_set_configuration()'s kick to sysfs
887          */
888         if (status == 0) {
889                 if (actconfig && actconfig->desc.bConfigurationValue == u)
890                         status = usb_reset_configuration(ps->dev);
891                 else
892                         status = usb_set_configuration(ps->dev, u);
893         }
894
895         return status;
896 }
897
898 static int proc_do_submiturb(struct dev_state *ps, struct usbdevfs_urb *uurb,
899                              struct usbdevfs_iso_packet_desc __user *iso_frame_desc,
900                              void __user *arg)
901 {
902         struct usbdevfs_iso_packet_desc *isopkt = NULL;
903         struct usb_host_endpoint *ep;
904         struct async *as;
905         struct usb_ctrlrequest *dr = NULL;
906         unsigned int u, totlen, isofrmlen;
907         int ret, interval = 0, ifnum = -1;
908
909         if (uurb->flags & ~(USBDEVFS_URB_ISO_ASAP|USBDEVFS_URB_SHORT_NOT_OK|
910                            URB_NO_FSBR|URB_ZERO_PACKET))
911                 return -EINVAL;
912         if (!uurb->buffer)
913                 return -EINVAL;
914         if (uurb->signr != 0 && (uurb->signr < SIGRTMIN || uurb->signr > SIGRTMAX))
915                 return -EINVAL;
916         if (!(uurb->type == USBDEVFS_URB_TYPE_CONTROL && (uurb->endpoint & ~USB_ENDPOINT_DIR_MASK) == 0)) {
917                 if ((ifnum = findintfep(ps->dev, uurb->endpoint)) < 0)
918                         return ifnum;
919                 if ((ret = checkintf(ps, ifnum)))
920                         return ret;
921         }
922         if ((uurb->endpoint & USB_ENDPOINT_DIR_MASK) != 0)
923                 ep = ps->dev->ep_in [uurb->endpoint & USB_ENDPOINT_NUMBER_MASK];
924         else
925                 ep = ps->dev->ep_out [uurb->endpoint & USB_ENDPOINT_NUMBER_MASK];
926         if (!ep)
927                 return -ENOENT;
928         switch(uurb->type) {
929         case USBDEVFS_URB_TYPE_CONTROL:
930                 if ((ep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
931                                 != USB_ENDPOINT_XFER_CONTROL)
932                         return -EINVAL;
933                 /* min 8 byte setup packet, max 8 byte setup plus an arbitrary data stage */
934                 if (uurb->buffer_length < 8 || uurb->buffer_length > (8 + MAX_USBFS_BUFFER_SIZE))
935                         return -EINVAL;
936                 if (!(dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL)))
937                         return -ENOMEM;
938                 if (copy_from_user(dr, uurb->buffer, 8)) {
939                         kfree(dr);
940                         return -EFAULT;
941                 }
942                 if (uurb->buffer_length < (le16_to_cpup(&dr->wLength) + 8)) {
943                         kfree(dr);
944                         return -EINVAL;
945                 }
946                 if ((ret = check_ctrlrecip(ps, dr->bRequestType, le16_to_cpup(&dr->wIndex)))) {
947                         kfree(dr);
948                         return ret;
949                 }
950                 uurb->endpoint = (uurb->endpoint & ~USB_ENDPOINT_DIR_MASK) | (dr->bRequestType & USB_ENDPOINT_DIR_MASK);
951                 uurb->number_of_packets = 0;
952                 uurb->buffer_length = le16_to_cpup(&dr->wLength);
953                 uurb->buffer += 8;
954                 if (!access_ok((uurb->endpoint & USB_DIR_IN) ?  VERIFY_WRITE : VERIFY_READ, uurb->buffer, uurb->buffer_length)) {
955                         kfree(dr);
956                         return -EFAULT;
957                 }
958                 snoop(&ps->dev->dev, "control urb\n");
959                 break;
960
961         case USBDEVFS_URB_TYPE_BULK:
962                 switch (ep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) {
963                 case USB_ENDPOINT_XFER_CONTROL:
964                 case USB_ENDPOINT_XFER_ISOC:
965                         return -EINVAL;
966                 /* allow single-shot interrupt transfers, at bogus rates */
967                 }
968                 uurb->number_of_packets = 0;
969                 if (uurb->buffer_length > MAX_USBFS_BUFFER_SIZE)
970                         return -EINVAL;
971                 if (!access_ok((uurb->endpoint & USB_DIR_IN) ? VERIFY_WRITE : VERIFY_READ, uurb->buffer, uurb->buffer_length))
972                         return -EFAULT;
973                 snoop(&ps->dev->dev, "bulk urb\n");
974                 break;
975
976         case USBDEVFS_URB_TYPE_ISO:
977                 /* arbitrary limit */
978                 if (uurb->number_of_packets < 1 || uurb->number_of_packets > 128)
979                         return -EINVAL;
980                 if ((ep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
981                                 != USB_ENDPOINT_XFER_ISOC)
982                         return -EINVAL;
983                 interval = 1 << min (15, ep->desc.bInterval - 1);
984                 isofrmlen = sizeof(struct usbdevfs_iso_packet_desc) * uurb->number_of_packets;
985                 if (!(isopkt = kmalloc(isofrmlen, GFP_KERNEL)))
986                         return -ENOMEM;
987                 if (copy_from_user(isopkt, iso_frame_desc, isofrmlen)) {
988                         kfree(isopkt);
989                         return -EFAULT;
990                 }
991                 for (totlen = u = 0; u < uurb->number_of_packets; u++) {
992                         /* arbitrary limit, sufficient for USB 2.0 high-bandwidth iso */
993                         if (isopkt[u].length > 8192) {
994                                 kfree(isopkt);
995                                 return -EINVAL;
996                         }
997                         totlen += isopkt[u].length;
998                 }
999                 if (totlen > 32768) {
1000                         kfree(isopkt);
1001                         return -EINVAL;
1002                 }
1003                 uurb->buffer_length = totlen;
1004                 snoop(&ps->dev->dev, "iso urb\n");
1005                 break;
1006
1007         case USBDEVFS_URB_TYPE_INTERRUPT:
1008                 uurb->number_of_packets = 0;
1009                 if ((ep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
1010                                 != USB_ENDPOINT_XFER_INT)
1011                         return -EINVAL;
1012                 if (ps->dev->speed == USB_SPEED_HIGH)
1013                         interval = 1 << min (15, ep->desc.bInterval - 1);
1014                 else
1015                         interval = ep->desc.bInterval;
1016                 if (uurb->buffer_length > MAX_USBFS_BUFFER_SIZE)
1017                         return -EINVAL;
1018                 if (!access_ok((uurb->endpoint & USB_DIR_IN) ? VERIFY_WRITE : VERIFY_READ, uurb->buffer, uurb->buffer_length))
1019                         return -EFAULT;
1020                 snoop(&ps->dev->dev, "interrupt urb\n");
1021                 break;
1022
1023         default:
1024                 return -EINVAL;
1025         }
1026         if (!(as = alloc_async(uurb->number_of_packets))) {
1027                 kfree(isopkt);
1028                 kfree(dr);
1029                 return -ENOMEM;
1030         }
1031         if (!(as->urb->transfer_buffer = kmalloc(uurb->buffer_length, GFP_KERNEL))) {
1032                 kfree(isopkt);
1033                 kfree(dr);
1034                 free_async(as);
1035                 return -ENOMEM;
1036         }
1037         as->urb->dev = ps->dev;
1038         as->urb->pipe = (uurb->type << 30) | __create_pipe(ps->dev, uurb->endpoint & 0xf) | (uurb->endpoint & USB_DIR_IN);
1039         as->urb->transfer_flags = uurb->flags;
1040         as->urb->transfer_buffer_length = uurb->buffer_length;
1041         as->urb->setup_packet = (unsigned char*)dr;
1042         as->urb->start_frame = uurb->start_frame;
1043         as->urb->number_of_packets = uurb->number_of_packets;
1044         as->urb->interval = interval;
1045         as->urb->context = as;
1046         as->urb->complete = async_completed;
1047         for (totlen = u = 0; u < uurb->number_of_packets; u++) {
1048                 as->urb->iso_frame_desc[u].offset = totlen;
1049                 as->urb->iso_frame_desc[u].length = isopkt[u].length;
1050                 totlen += isopkt[u].length;
1051         }
1052         kfree(isopkt);
1053         as->ps = ps;
1054         as->userurb = arg;
1055         if (uurb->endpoint & USB_DIR_IN)
1056                 as->userbuffer = uurb->buffer;
1057         else
1058                 as->userbuffer = NULL;
1059         as->signr = uurb->signr;
1060         as->ifnum = ifnum;
1061         as->pid = current->pid;
1062         as->uid = current->uid;
1063         as->euid = current->euid;
1064         security_task_getsecid(current, &as->secid);
1065         if (!(uurb->endpoint & USB_DIR_IN)) {
1066                 if (copy_from_user(as->urb->transfer_buffer, uurb->buffer, as->urb->transfer_buffer_length)) {
1067                         free_async(as);
1068                         return -EFAULT;
1069                 }
1070         }
1071         snoop(&as->urb->dev->dev, "submit urb\n");
1072         snoop_urb(as->urb, as->userurb);
1073         async_newpending(as);
1074         if ((ret = usb_submit_urb(as->urb, GFP_KERNEL))) {
1075                 dev_printk(KERN_DEBUG, &ps->dev->dev, "usbfs: usb_submit_urb returned %d\n", ret);
1076                 async_removepending(as);
1077                 free_async(as);
1078                 return ret;
1079         }
1080         return 0;
1081 }
1082
1083 static int proc_submiturb(struct dev_state *ps, void __user *arg)
1084 {
1085         struct usbdevfs_urb uurb;
1086
1087         if (copy_from_user(&uurb, arg, sizeof(uurb)))
1088                 return -EFAULT;
1089
1090         return proc_do_submiturb(ps, &uurb, (((struct usbdevfs_urb __user *)arg)->iso_frame_desc), arg);
1091 }
1092
1093 static int proc_unlinkurb(struct dev_state *ps, void __user *arg)
1094 {
1095         struct async *as;
1096
1097         as = async_getpending(ps, arg);
1098         if (!as)
1099                 return -EINVAL;
1100         usb_kill_urb(as->urb);
1101         return 0;
1102 }
1103
1104 static int processcompl(struct async *as, void __user * __user *arg)
1105 {
1106         struct urb *urb = as->urb;
1107         struct usbdevfs_urb __user *userurb = as->userurb;
1108         void __user *addr = as->userurb;
1109         unsigned int i;
1110
1111         if (as->userbuffer)
1112                 if (copy_to_user(as->userbuffer, urb->transfer_buffer, urb->transfer_buffer_length))
1113                         return -EFAULT;
1114         if (put_user(urb->status, &userurb->status))
1115                 return -EFAULT;
1116         if (put_user(urb->actual_length, &userurb->actual_length))
1117                 return -EFAULT;
1118         if (put_user(urb->error_count, &userurb->error_count))
1119                 return -EFAULT;
1120
1121         if (usb_pipeisoc(urb->pipe)) {
1122                 for (i = 0; i < urb->number_of_packets; i++) {
1123                         if (put_user(urb->iso_frame_desc[i].actual_length,
1124                                      &userurb->iso_frame_desc[i].actual_length))
1125                                 return -EFAULT;
1126                         if (put_user(urb->iso_frame_desc[i].status,
1127                                      &userurb->iso_frame_desc[i].status))
1128                                 return -EFAULT;
1129                 }
1130         }
1131
1132         free_async(as);
1133
1134         if (put_user(addr, (void __user * __user *)arg))
1135                 return -EFAULT;
1136         return 0;
1137 }
1138
1139 static struct async* reap_as(struct dev_state *ps)
1140 {
1141         DECLARE_WAITQUEUE(wait, current);
1142         struct async *as = NULL;
1143         struct usb_device *dev = ps->dev;
1144
1145         add_wait_queue(&ps->wait, &wait);
1146         for (;;) {
1147                 __set_current_state(TASK_INTERRUPTIBLE);
1148                 if ((as = async_getcompleted(ps)))
1149                         break;
1150                 if (signal_pending(current))
1151                         break;
1152                 usb_unlock_device(dev);
1153                 schedule();
1154                 usb_lock_device(dev);
1155         }
1156         remove_wait_queue(&ps->wait, &wait);
1157         set_current_state(TASK_RUNNING);
1158         return as;
1159 }
1160
1161 static int proc_reapurb(struct dev_state *ps, void __user *arg)
1162 {
1163         struct async *as = reap_as(ps);
1164         if (as)
1165                 return processcompl(as, (void __user * __user *)arg);
1166         if (signal_pending(current))
1167                 return -EINTR;
1168         return -EIO;
1169 }
1170
1171 static int proc_reapurbnonblock(struct dev_state *ps, void __user *arg)
1172 {
1173         struct async *as;
1174
1175         if (!(as = async_getcompleted(ps)))
1176                 return -EAGAIN;
1177         return processcompl(as, (void __user * __user *)arg);
1178 }
1179
1180 #ifdef CONFIG_COMPAT
1181
1182 static int get_urb32(struct usbdevfs_urb *kurb,
1183                      struct usbdevfs_urb32 __user *uurb)
1184 {
1185         __u32  uptr;
1186         if (get_user(kurb->type, &uurb->type) ||
1187             __get_user(kurb->endpoint, &uurb->endpoint) ||
1188             __get_user(kurb->status, &uurb->status) ||
1189             __get_user(kurb->flags, &uurb->flags) ||
1190             __get_user(kurb->buffer_length, &uurb->buffer_length) ||
1191             __get_user(kurb->actual_length, &uurb->actual_length) ||
1192             __get_user(kurb->start_frame, &uurb->start_frame) ||
1193             __get_user(kurb->number_of_packets, &uurb->number_of_packets) ||
1194             __get_user(kurb->error_count, &uurb->error_count) ||
1195             __get_user(kurb->signr, &uurb->signr))
1196                 return -EFAULT;
1197
1198         if (__get_user(uptr, &uurb->buffer))
1199                 return -EFAULT;
1200         kurb->buffer = compat_ptr(uptr);
1201         if (__get_user(uptr, &uurb->buffer))
1202                 return -EFAULT;
1203         kurb->usercontext = compat_ptr(uptr);
1204
1205         return 0;
1206 }
1207
1208 static int proc_submiturb_compat(struct dev_state *ps, void __user *arg)
1209 {
1210         struct usbdevfs_urb uurb;
1211
1212         if (get_urb32(&uurb,(struct usbdevfs_urb32 *)arg))
1213                 return -EFAULT;
1214
1215         return proc_do_submiturb(ps, &uurb, ((struct usbdevfs_urb32 __user *)arg)->iso_frame_desc, arg);
1216 }
1217
1218 static int processcompl_compat(struct async *as, void __user * __user *arg)
1219 {
1220         struct urb *urb = as->urb;
1221         struct usbdevfs_urb32 __user *userurb = as->userurb;
1222         void __user *addr = as->userurb;
1223         unsigned int i;
1224
1225         if (as->userbuffer)
1226                 if (copy_to_user(as->userbuffer, urb->transfer_buffer, urb->transfer_buffer_length))
1227                         return -EFAULT;
1228         if (put_user(urb->status, &userurb->status))
1229                 return -EFAULT;
1230         if (put_user(urb->actual_length, &userurb->actual_length))
1231                 return -EFAULT;
1232         if (put_user(urb->error_count, &userurb->error_count))
1233                 return -EFAULT;
1234
1235         if (usb_pipeisoc(urb->pipe)) {
1236                 for (i = 0; i < urb->number_of_packets; i++) {
1237                         if (put_user(urb->iso_frame_desc[i].actual_length,
1238                                      &userurb->iso_frame_desc[i].actual_length))
1239                                 return -EFAULT;
1240                         if (put_user(urb->iso_frame_desc[i].status,
1241                                      &userurb->iso_frame_desc[i].status))
1242                                 return -EFAULT;
1243                 }
1244         }
1245
1246         free_async(as);
1247         if (put_user((u32)(u64)addr, (u32 __user *)arg))
1248                 return -EFAULT;
1249         return 0;
1250 }
1251
1252 static int proc_reapurb_compat(struct dev_state *ps, void __user *arg)
1253 {
1254         struct async *as = reap_as(ps);
1255         if (as)
1256                 return processcompl_compat(as, (void __user * __user *)arg);
1257         if (signal_pending(current))
1258                 return -EINTR;
1259         return -EIO;
1260 }
1261
1262 static int proc_reapurbnonblock_compat(struct dev_state *ps, void __user *arg)
1263 {
1264         struct async *as;
1265
1266         if (!(as = async_getcompleted(ps)))
1267                 return -EAGAIN;
1268         return processcompl_compat(as, (void __user * __user *)arg);
1269 }
1270
1271 #endif
1272
1273 static int proc_disconnectsignal(struct dev_state *ps, void __user *arg)
1274 {
1275         struct usbdevfs_disconnectsignal ds;
1276
1277         if (copy_from_user(&ds, arg, sizeof(ds)))
1278                 return -EFAULT;
1279         if (ds.signr != 0 && (ds.signr < SIGRTMIN || ds.signr > SIGRTMAX))
1280                 return -EINVAL;
1281         ps->discsignr = ds.signr;
1282         ps->disccontext = ds.context;
1283         return 0;
1284 }
1285
1286 static int proc_claiminterface(struct dev_state *ps, void __user *arg)
1287 {
1288         unsigned int ifnum;
1289
1290         if (get_user(ifnum, (unsigned int __user *)arg))
1291                 return -EFAULT;
1292         return claimintf(ps, ifnum);
1293 }
1294
1295 static int proc_releaseinterface(struct dev_state *ps, void __user *arg)
1296 {
1297         unsigned int ifnum;
1298         int ret;
1299
1300         if (get_user(ifnum, (unsigned int __user *)arg))
1301                 return -EFAULT;
1302         if ((ret = releaseintf(ps, ifnum)) < 0)
1303                 return ret;
1304         destroy_async_on_interface (ps, ifnum);
1305         return 0;
1306 }
1307
1308 static int proc_ioctl(struct dev_state *ps, struct usbdevfs_ioctl *ctl)
1309 {
1310         int                     size;
1311         void                    *buf = NULL;
1312         int                     retval = 0;
1313         struct usb_interface    *intf = NULL;
1314         struct usb_driver       *driver = NULL;
1315
1316         /* alloc buffer */
1317         if ((size = _IOC_SIZE (ctl->ioctl_code)) > 0) {
1318                 if ((buf = kmalloc (size, GFP_KERNEL)) == NULL)
1319                         return -ENOMEM;
1320                 if ((_IOC_DIR(ctl->ioctl_code) & _IOC_WRITE)) {
1321                         if (copy_from_user (buf, ctl->data, size)) {
1322                                 kfree(buf);
1323                                 return -EFAULT;
1324                         }
1325                 } else {
1326                         memset (buf, 0, size);
1327                 }
1328         }
1329
1330         if (!connected(ps)) {
1331                 kfree(buf);
1332                 return -ENODEV;
1333         }
1334
1335         if (ps->dev->state != USB_STATE_CONFIGURED)
1336                 retval = -EHOSTUNREACH;
1337         else if (!(intf = usb_ifnum_to_if (ps->dev, ctl->ifno)))
1338                retval = -EINVAL;
1339         else switch (ctl->ioctl_code) {
1340
1341         /* disconnect kernel driver from interface */
1342         case USBDEVFS_DISCONNECT:
1343
1344                 down_write(&usb_bus_type.subsys.rwsem);
1345                 if (intf->dev.driver) {
1346                         driver = to_usb_driver(intf->dev.driver);
1347                         dev_dbg (&intf->dev, "disconnect by usbfs\n");
1348                         usb_driver_release_interface(driver, intf);
1349                 } else
1350                         retval = -ENODATA;
1351                 up_write(&usb_bus_type.subsys.rwsem);
1352                 break;
1353
1354         /* let kernel drivers try to (re)bind to the interface */
1355         case USBDEVFS_CONNECT:
1356                 usb_unlock_device(ps->dev);
1357                 bus_rescan_devices(intf->dev.bus);
1358                 usb_lock_device(ps->dev);
1359                 break;
1360
1361         /* talk directly to the interface's driver */
1362         default:
1363                 down_read(&usb_bus_type.subsys.rwsem);
1364                 if (intf->dev.driver)
1365                         driver = to_usb_driver(intf->dev.driver);
1366                 if (driver == NULL || driver->ioctl == NULL) {
1367                         retval = -ENOTTY;
1368                 } else {
1369                         retval = driver->ioctl (intf, ctl->ioctl_code, buf);
1370                         if (retval == -ENOIOCTLCMD)
1371                                 retval = -ENOTTY;
1372                 }
1373                 up_read(&usb_bus_type.subsys.rwsem);
1374         }
1375
1376         /* cleanup and return */
1377         if (retval >= 0
1378                         && (_IOC_DIR (ctl->ioctl_code) & _IOC_READ) != 0
1379                         && size > 0
1380                         && copy_to_user (ctl->data, buf, size) != 0)
1381                 retval = -EFAULT;
1382
1383         kfree(buf);
1384         return retval;
1385 }
1386
1387 static int proc_ioctl_default(struct dev_state *ps, void __user *arg)
1388 {
1389         struct usbdevfs_ioctl   ctrl;
1390
1391         if (copy_from_user(&ctrl, arg, sizeof (ctrl)))
1392                 return -EFAULT;
1393         return proc_ioctl(ps, &ctrl);
1394 }
1395
1396 #ifdef CONFIG_COMPAT
1397 static int proc_ioctl_compat(struct dev_state *ps, compat_uptr_t arg)
1398 {
1399         struct usbdevfs_ioctl32 __user *uioc;
1400         struct usbdevfs_ioctl ctrl;
1401         u32 udata;
1402
1403         uioc = compat_ptr((long)arg);
1404         if (get_user(ctrl.ifno, &uioc->ifno) ||
1405             get_user(ctrl.ioctl_code, &uioc->ioctl_code) ||
1406             __get_user(udata, &uioc->data))
1407                 return -EFAULT;
1408         ctrl.data = compat_ptr(udata);
1409
1410         return proc_ioctl(ps, &ctrl);
1411 }
1412 #endif
1413
1414 /*
1415  * NOTE:  All requests here that have interface numbers as parameters
1416  * are assuming that somehow the configuration has been prevented from
1417  * changing.  But there's no mechanism to ensure that...
1418  */
1419 static int usbdev_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
1420 {
1421         struct dev_state *ps = (struct dev_state *)file->private_data;
1422         struct usb_device *dev = ps->dev;
1423         void __user *p = (void __user *)arg;
1424         int ret = -ENOTTY;
1425
1426         if (!(file->f_mode & FMODE_WRITE))
1427                 return -EPERM;
1428         usb_lock_device(dev);
1429         if (!connected(ps)) {
1430                 usb_unlock_device(dev);
1431                 return -ENODEV;
1432         }
1433
1434         switch (cmd) {
1435         case USBDEVFS_CONTROL:
1436                 snoop(&dev->dev, "%s: CONTROL\n", __FUNCTION__);
1437                 ret = proc_control(ps, p);
1438                 if (ret >= 0)
1439                         inode->i_mtime = CURRENT_TIME;
1440                 break;
1441
1442         case USBDEVFS_BULK:
1443                 snoop(&dev->dev, "%s: BULK\n", __FUNCTION__);
1444                 ret = proc_bulk(ps, p);
1445                 if (ret >= 0)
1446                         inode->i_mtime = CURRENT_TIME;
1447                 break;
1448
1449         case USBDEVFS_RESETEP:
1450                 snoop(&dev->dev, "%s: RESETEP\n", __FUNCTION__);
1451                 ret = proc_resetep(ps, p);
1452                 if (ret >= 0)
1453                         inode->i_mtime = CURRENT_TIME;
1454                 break;
1455
1456         case USBDEVFS_RESET:
1457                 snoop(&dev->dev, "%s: RESET\n", __FUNCTION__);
1458                 ret = proc_resetdevice(ps);
1459                 break;
1460
1461         case USBDEVFS_CLEAR_HALT:
1462                 snoop(&dev->dev, "%s: CLEAR_HALT\n", __FUNCTION__);
1463                 ret = proc_clearhalt(ps, p);
1464                 if (ret >= 0)
1465                         inode->i_mtime = CURRENT_TIME;
1466                 break;
1467
1468         case USBDEVFS_GETDRIVER:
1469                 snoop(&dev->dev, "%s: GETDRIVER\n", __FUNCTION__);
1470                 ret = proc_getdriver(ps, p);
1471                 break;
1472
1473         case USBDEVFS_CONNECTINFO:
1474                 snoop(&dev->dev, "%s: CONNECTINFO\n", __FUNCTION__);
1475                 ret = proc_connectinfo(ps, p);
1476                 break;
1477
1478         case USBDEVFS_SETINTERFACE:
1479                 snoop(&dev->dev, "%s: SETINTERFACE\n", __FUNCTION__);
1480                 ret = proc_setintf(ps, p);
1481                 break;
1482
1483         case USBDEVFS_SETCONFIGURATION:
1484                 snoop(&dev->dev, "%s: SETCONFIGURATION\n", __FUNCTION__);
1485                 ret = proc_setconfig(ps, p);
1486                 break;
1487
1488         case USBDEVFS_SUBMITURB:
1489                 snoop(&dev->dev, "%s: SUBMITURB\n", __FUNCTION__);
1490                 ret = proc_submiturb(ps, p);
1491                 if (ret >= 0)
1492                         inode->i_mtime = CURRENT_TIME;
1493                 break;
1494
1495 #ifdef CONFIG_COMPAT
1496
1497         case USBDEVFS_SUBMITURB32:
1498                 snoop(&dev->dev, "%s: SUBMITURB32\n", __FUNCTION__);
1499                 ret = proc_submiturb_compat(ps, p);
1500                 if (ret >= 0)
1501                         inode->i_mtime = CURRENT_TIME;
1502                 break;
1503
1504         case USBDEVFS_REAPURB32:
1505                 snoop(&dev->dev, "%s: REAPURB32\n", __FUNCTION__);
1506                 ret = proc_reapurb_compat(ps, p);
1507                 break;
1508
1509         case USBDEVFS_REAPURBNDELAY32:
1510                 snoop(&dev->dev, "%s: REAPURBDELAY32\n", __FUNCTION__);
1511                 ret = proc_reapurbnonblock_compat(ps, p);
1512                 break;
1513
1514         case USBDEVFS_IOCTL32:
1515                 snoop(&dev->dev, "%s: IOCTL\n", __FUNCTION__);
1516                 ret = proc_ioctl_compat(ps, (compat_uptr_t)(long)p);
1517                 break;
1518 #endif
1519
1520         case USBDEVFS_DISCARDURB:
1521                 snoop(&dev->dev, "%s: DISCARDURB\n", __FUNCTION__);
1522                 ret = proc_unlinkurb(ps, p);
1523                 break;
1524
1525         case USBDEVFS_REAPURB:
1526                 snoop(&dev->dev, "%s: REAPURB\n", __FUNCTION__);
1527                 ret = proc_reapurb(ps, p);
1528                 break;
1529
1530         case USBDEVFS_REAPURBNDELAY:
1531                 snoop(&dev->dev, "%s: REAPURBDELAY\n", __FUNCTION__);
1532                 ret = proc_reapurbnonblock(ps, p);
1533                 break;
1534
1535         case USBDEVFS_DISCSIGNAL:
1536                 snoop(&dev->dev, "%s: DISCSIGNAL\n", __FUNCTION__);
1537                 ret = proc_disconnectsignal(ps, p);
1538                 break;
1539
1540         case USBDEVFS_CLAIMINTERFACE:
1541                 snoop(&dev->dev, "%s: CLAIMINTERFACE\n", __FUNCTION__);
1542                 ret = proc_claiminterface(ps, p);
1543                 break;
1544
1545         case USBDEVFS_RELEASEINTERFACE:
1546                 snoop(&dev->dev, "%s: RELEASEINTERFACE\n", __FUNCTION__);
1547                 ret = proc_releaseinterface(ps, p);
1548                 break;
1549
1550         case USBDEVFS_IOCTL:
1551                 snoop(&dev->dev, "%s: IOCTL\n", __FUNCTION__);
1552                 ret = proc_ioctl_default(ps, p);
1553                 break;
1554         }
1555         usb_unlock_device(dev);
1556         if (ret >= 0)
1557                 inode->i_atime = CURRENT_TIME;
1558         return ret;
1559 }
1560
1561 /* No kernel lock - fine */
1562 static unsigned int usbdev_poll(struct file *file, struct poll_table_struct *wait)
1563 {
1564         struct dev_state *ps = (struct dev_state *)file->private_data;
1565         unsigned int mask = 0;
1566
1567         poll_wait(file, &ps->wait, wait);
1568         if (file->f_mode & FMODE_WRITE && !list_empty(&ps->async_completed))
1569                 mask |= POLLOUT | POLLWRNORM;
1570         if (!connected(ps))
1571                 mask |= POLLERR | POLLHUP;
1572         return mask;
1573 }
1574
1575 const struct file_operations usbfs_device_file_operations = {
1576         .llseek =       usbdev_lseek,
1577         .read =         usbdev_read,
1578         .poll =         usbdev_poll,
1579         .ioctl =        usbdev_ioctl,
1580         .open =         usbdev_open,
1581         .release =      usbdev_release,
1582 };
1583
1584 static void usbdev_add(struct usb_device *dev)
1585 {
1586         int minor = ((dev->bus->busnum-1) * 128) + (dev->devnum-1);
1587
1588         dev->class_dev = class_device_create(usb_device_class, NULL,
1589                                 MKDEV(USB_DEVICE_MAJOR, minor), &dev->dev,
1590                                 "usbdev%d.%d", dev->bus->busnum, dev->devnum);
1591
1592         dev->class_dev->class_data = dev;
1593 }
1594
1595 static void usbdev_remove(struct usb_device *dev)
1596 {
1597         class_device_unregister(dev->class_dev);
1598 }
1599
1600 static int usbdev_notify(struct notifier_block *self, unsigned long action,
1601                          void *dev)
1602 {
1603         switch (action) {
1604         case USB_DEVICE_ADD:
1605                 usbdev_add(dev);
1606                 break;
1607         case USB_DEVICE_REMOVE:
1608                 usbdev_remove(dev);
1609                 break;
1610         }
1611         return NOTIFY_OK;
1612 }
1613
1614 static struct notifier_block usbdev_nb = {
1615         .notifier_call =        usbdev_notify,
1616 };
1617
1618 static struct cdev usb_device_cdev = {
1619         .kobj   = {.name = "usb_device", },
1620         .owner  = THIS_MODULE,
1621 };
1622
1623 int __init usbdev_init(void)
1624 {
1625         int retval;
1626
1627         retval = register_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX,
1628                         "usb_device");
1629         if (retval) {
1630                 err("unable to register minors for usb_device");
1631                 goto out;
1632         }
1633         cdev_init(&usb_device_cdev, &usbfs_device_file_operations);
1634         retval = cdev_add(&usb_device_cdev, USB_DEVICE_DEV, USB_DEVICE_MAX);
1635         if (retval) {
1636                 err("unable to get usb_device major %d", USB_DEVICE_MAJOR);
1637                 goto error_cdev;
1638         }
1639         usb_device_class = class_create(THIS_MODULE, "usb_device");
1640         if (IS_ERR(usb_device_class)) {
1641                 err("unable to register usb_device class");
1642                 retval = PTR_ERR(usb_device_class);
1643                 goto error_class;
1644         }
1645
1646         usb_register_notify(&usbdev_nb);
1647
1648 out:
1649         return retval;
1650
1651 error_class:
1652         usb_device_class = NULL;
1653         cdev_del(&usb_device_cdev);
1654
1655 error_cdev:
1656         unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
1657         goto out;
1658 }
1659
1660 void usbdev_cleanup(void)
1661 {
1662         usb_unregister_notify(&usbdev_nb);
1663         class_destroy(usb_device_class);
1664         cdev_del(&usb_device_cdev);
1665         unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
1666 }
1667