?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
USB: add API for userspace drivers to "claim" ports
[linux-2.6/linux-2.6-openrd.git] / drivers / usb / core / devio.c
blob165de5d5900549379d09dd8ce0d49b08cc83fd4d
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 * This file implements the usbfs/x/y files, where
23 * x is the bus number and y the device number.
24 *
25 * It allows user space programs/"drivers" to communicate directly
26 * with USB devices without intervening kernel driver.
27 *
28 * Revision history
29 * 22.12.1999 0.1 Initial release (split from proc_usb.c)
30 * 04.01.2000 0.2 Turned into its own filesystem
31 * 30.09.2005 0.3 Fix user-triggerable oops in async URB delivery
32 * (CAN-2005-3055)
33 */
34
35 /*****************************************************************************/
36
37 #include <linux/fs.h>
38 #include <linux/mm.h>
39 #include <linux/slab.h>
40 #include <linux/smp_lock.h>
41 #include <linux/signal.h>
42 #include <linux/poll.h>
43 #include <linux/module.h>
44 #include <linux/usb.h>
45 #include <linux/usbdevice_fs.h>
46 #include <linux/cdev.h>
47 #include <linux/notifier.h>
48 #include <linux/security.h>
49 #include <asm/uaccess.h>
50 #include <asm/byteorder.h>
51 #include <linux/moduleparam.h>
52
53 #include "hcd.h" /* for usbcore internals */
54 #include "usb.h"
55 #include "hub.h"
56
57 #define USB_MAXBUS 64
58 #define USB_DEVICE_MAX USB_MAXBUS * 128
59
60 /* Mutual exclusion for removal, open, and release */
61 DEFINE_MUTEX(usbfs_mutex);
62
63 struct dev_state {
64 struct list_head list; /* state list */
65 struct usb_device *dev;
66 struct file *file;
67 spinlock_t lock; /* protects the async urb lists */
68 struct list_head async_pending;
69 struct list_head async_completed;
70 wait_queue_head_t wait; /* wake up if a request completed */
71 unsigned int discsignr;
72 struct pid *disc_pid;
73 uid_t disc_uid, disc_euid;
74 void __user *disccontext;
75 unsigned long ifclaimed;
76 u32 secid;
77 };
78
79 struct async {
80 struct list_head asynclist;
81 struct dev_state *ps;
82 struct pid *pid;
83 uid_t uid, euid;
84 unsigned int signr;
85 unsigned int ifnum;
86 void __user *userbuffer;
87 void __user *userurb;
88 struct urb *urb;
89 int status;
90 u32 secid;
91 };
92
93 static int usbfs_snoop;
94 module_param(usbfs_snoop, bool, S_IRUGO | S_IWUSR);
95 MODULE_PARM_DESC(usbfs_snoop, "true to log all usbfs traffic");
96
97 #define snoop(dev, format, arg...) \
98 do { \
99 if (usbfs_snoop) \
100 dev_info(dev , format , ## arg); \
101 } while (0)
102
103 #define USB_DEVICE_DEV MKDEV(USB_DEVICE_MAJOR, 0)
104
105
106 #define MAX_USBFS_BUFFER_SIZE 16384
107
108 static int connected(struct dev_state *ps)
109 {
110 return (!list_empty(&ps->list) &&
111 ps->dev->state != USB_STATE_NOTATTACHED);
112 }
113
114 static loff_t usbdev_lseek(struct file *file, loff_t offset, int orig)
115 {
116 loff_t ret;
117
118 lock_kernel();
119
120 switch (orig) {
121 case 0:
122 file->f_pos = offset;
123 ret = file->f_pos;
124 break;
125 case 1:
126 file->f_pos += offset;
127 ret = file->f_pos;
128 break;
129 case 2:
130 default:
131 ret = -EINVAL;
132 }
133
134 unlock_kernel();
135 return ret;
136 }
137
138 static ssize_t usbdev_read(struct file *file, char __user *buf, size_t nbytes,
139 loff_t *ppos)
140 {
141 struct dev_state *ps = file->private_data;
142 struct usb_device *dev = ps->dev;
143 ssize_t ret = 0;
144 unsigned len;
145 loff_t pos;
146 int i;
147
148 pos = *ppos;
149 usb_lock_device(dev);
150 if (!connected(ps)) {
151 ret = -ENODEV;
152 goto err;
153 } else if (pos < 0) {
154 ret = -EINVAL;
155 goto err;
156 }
157
158 if (pos < sizeof(struct usb_device_descriptor)) {
159 /* 18 bytes - fits on the stack */
160 struct usb_device_descriptor temp_desc;
161
162 memcpy(&temp_desc, &dev->descriptor, sizeof(dev->descriptor));
163 le16_to_cpus(&temp_desc.bcdUSB);
164 le16_to_cpus(&temp_desc.idVendor);
165 le16_to_cpus(&temp_desc.idProduct);
166 le16_to_cpus(&temp_desc.bcdDevice);
167
168 len = sizeof(struct usb_device_descriptor) - pos;
169 if (len > nbytes)
170 len = nbytes;
171 if (copy_to_user(buf, ((char *)&temp_desc) + pos, len)) {
172 ret = -EFAULT;
173 goto err;
174 }
175
176 *ppos += len;
177 buf += len;
178 nbytes -= len;
179 ret += len;
180 }
181
182 pos = sizeof(struct usb_device_descriptor);
183 for (i = 0; nbytes && i < dev->descriptor.bNumConfigurations; i++) {
184 struct usb_config_descriptor *config =
185 (struct usb_config_descriptor *)dev->rawdescriptors[i];
186 unsigned int length = le16_to_cpu(config->wTotalLength);
187
188 if (*ppos < pos + length) {
189
190 /* The descriptor may claim to be longer than it
191 * really is. Here is the actual allocated length. */
192 unsigned alloclen =
193 le16_to_cpu(dev->config[i].desc.wTotalLength);
194
195 len = length - (*ppos - pos);
196 if (len > nbytes)
197 len = nbytes;
198
199 /* Simply don't write (skip over) unallocated parts */
200 if (alloclen > (*ppos - pos)) {
201 alloclen -= (*ppos - pos);
202 if (copy_to_user(buf,
203 dev->rawdescriptors[i] + (*ppos - pos),
204 min(len, alloclen))) {
205 ret = -EFAULT;
206 goto err;
207 }
208 }
209
210 *ppos += len;
211 buf += len;
212 nbytes -= len;
213 ret += len;
214 }
215
216 pos += length;
217 }
218
219 err:
220 usb_unlock_device(dev);
221 return ret;
222 }
223
224 /*
225 * async list handling
226 */
227
228 static struct async *alloc_async(unsigned int numisoframes)
229 {
230 struct async *as;
231
232 as = kzalloc(sizeof(struct async), GFP_KERNEL);
233 if (!as)
234 return NULL;
235 as->urb = usb_alloc_urb(numisoframes, GFP_KERNEL);
236 if (!as->urb) {
237 kfree(as);
238 return NULL;
239 }
240 return as;
241 }
242
243 static void free_async(struct async *as)
244 {
245 put_pid(as->pid);
246 kfree(as->urb->transfer_buffer);
247 kfree(as->urb->setup_packet);
248 usb_free_urb(as->urb);
249 kfree(as);
250 }
251
252 static void async_newpending(struct async *as)
253 {
254 struct dev_state *ps = as->ps;
255 unsigned long flags;
256
257 spin_lock_irqsave(&ps->lock, flags);
258 list_add_tail(&as->asynclist, &ps->async_pending);
259 spin_unlock_irqrestore(&ps->lock, flags);
260 }
261
262 static void async_removepending(struct async *as)
263 {
264 struct dev_state *ps = as->ps;
265 unsigned long flags;
266
267 spin_lock_irqsave(&ps->lock, flags);
268 list_del_init(&as->asynclist);
269 spin_unlock_irqrestore(&ps->lock, flags);
270 }
271
272 static struct async *async_getcompleted(struct dev_state *ps)
273 {
274 unsigned long flags;
275 struct async *as = NULL;
276
277 spin_lock_irqsave(&ps->lock, flags);
278 if (!list_empty(&ps->async_completed)) {
279 as = list_entry(ps->async_completed.next, struct async,
280 asynclist);
281 list_del_init(&as->asynclist);
282 }
283 spin_unlock_irqrestore(&ps->lock, flags);
284 return as;
285 }
286
287 static struct async *async_getpending(struct dev_state *ps,
288 void __user *userurb)
289 {
290 unsigned long flags;
291 struct async *as;
292
293 spin_lock_irqsave(&ps->lock, flags);
294 list_for_each_entry(as, &ps->async_pending, asynclist)
295 if (as->userurb == userurb) {
296 list_del_init(&as->asynclist);
297 spin_unlock_irqrestore(&ps->lock, flags);
298 return as;
299 }
300 spin_unlock_irqrestore(&ps->lock, flags);
301 return NULL;
302 }
303
304 static void snoop_urb(struct urb *urb, void __user *userurb)
305 {
306 unsigned j;
307 unsigned char *data = urb->transfer_buffer;
308
309 if (!usbfs_snoop)
310 return;
311
312 dev_info(&urb->dev->dev, "direction=%s\n",
313 usb_urb_dir_in(urb) ? "IN" : "OUT");
314 dev_info(&urb->dev->dev, "userurb=%p\n", userurb);
315 dev_info(&urb->dev->dev, "transfer_buffer_length=%u\n",
316 urb->transfer_buffer_length);
317 dev_info(&urb->dev->dev, "actual_length=%u\n", urb->actual_length);
318 dev_info(&urb->dev->dev, "data: ");
319 for (j = 0; j < urb->transfer_buffer_length; ++j)
320 printk("%02x ", data[j]);
321 printk("\n");
322 }
323
324 static void async_completed(struct urb *urb)
325 {
326 struct async *as = urb->context;
327 struct dev_state *ps = as->ps;
328 struct siginfo sinfo;
329 struct pid *pid = NULL;
330 uid_t uid = 0;
331 uid_t euid = 0;
332 u32 secid = 0;
333 int signr;
334
335 spin_lock(&ps->lock);
336 list_move_tail(&as->asynclist, &ps->async_completed);
337 as->status = urb->status;
338 signr = as->signr;
339 if (signr) {
340 sinfo.si_signo = as->signr;
341 sinfo.si_errno = as->status;
342 sinfo.si_code = SI_ASYNCIO;
343 sinfo.si_addr = as->userurb;
344 pid = as->pid;
345 uid = as->uid;
346 euid = as->euid;
347 secid = as->secid;
348 }
349 snoop(&urb->dev->dev, "urb complete\n");
350 snoop_urb(urb, as->userurb);
351 spin_unlock(&ps->lock);
352
353 if (signr)
354 kill_pid_info_as_uid(sinfo.si_signo, &sinfo, pid, uid,
355 euid, secid);
356
357 wake_up(&ps->wait);
358 }
359
360 static void destroy_async(struct dev_state *ps, struct list_head *list)
361 {
362 struct async *as;
363 unsigned long flags;
364
365 spin_lock_irqsave(&ps->lock, flags);
366 while (!list_empty(list)) {
367 as = list_entry(list->next, struct async, asynclist);
368 list_del_init(&as->asynclist);
369
370 /* drop the spinlock so the completion handler can run */
371 spin_unlock_irqrestore(&ps->lock, flags);
372 usb_kill_urb(as->urb);
373 spin_lock_irqsave(&ps->lock, flags);
374 }
375 spin_unlock_irqrestore(&ps->lock, flags);
376 }
377
378 static void destroy_async_on_interface(struct dev_state *ps,
379 unsigned int ifnum)
380 {
381 struct list_head *p, *q, hitlist;
382 unsigned long flags;
383
384 INIT_LIST_HEAD(&hitlist);
385 spin_lock_irqsave(&ps->lock, flags);
386 list_for_each_safe(p, q, &ps->async_pending)
387 if (ifnum == list_entry(p, struct async, asynclist)->ifnum)
388 list_move_tail(p, &hitlist);
389 spin_unlock_irqrestore(&ps->lock, flags);
390 destroy_async(ps, &hitlist);
391 }
392
393 static void destroy_all_async(struct dev_state *ps)
394 {
395 destroy_async(ps, &ps->async_pending);
396 }
397
398 /*
399 * interface claims are made only at the request of user level code,
400 * which can also release them (explicitly or by closing files).
401 * they're also undone when devices disconnect.
402 */
403
404 static int driver_probe(struct usb_interface *intf,
405 const struct usb_device_id *id)
406 {
407 return -ENODEV;
408 }
409
410 static void driver_disconnect(struct usb_interface *intf)
411 {
412 struct dev_state *ps = usb_get_intfdata(intf);
413 unsigned int ifnum = intf->altsetting->desc.bInterfaceNumber;
414
415 if (!ps)
416 return;
417
418 /* NOTE: this relies on usbcore having canceled and completed
419 * all pending I/O requests; 2.6 does that.
420 */
421
422 if (likely(ifnum < 8*sizeof(ps->ifclaimed)))
423 clear_bit(ifnum, &ps->ifclaimed);
424 else
425 dev_warn(&intf->dev, "interface number %u out of range\n",
426 ifnum);
427
428 usb_set_intfdata(intf, NULL);
429
430 /* force async requests to complete */
431 destroy_async_on_interface(ps, ifnum);
432 }
433
434 /* The following routines are merely placeholders. There is no way
435 * to inform a user task about suspend or resumes.
436 */
437 static int driver_suspend(struct usb_interface *intf, pm_message_t msg)
438 {
439 return 0;
440 }
441
442 static int driver_resume(struct usb_interface *intf)
443 {
444 return 0;
445 }
446
447 struct usb_driver usbfs_driver = {
448 .name = "usbfs",
449 .probe = driver_probe,
450 .disconnect = driver_disconnect,
451 .suspend = driver_suspend,
452 .resume = driver_resume,
453 };
454
455 static int claimintf(struct dev_state *ps, unsigned int ifnum)
456 {
457 struct usb_device *dev = ps->dev;
458 struct usb_interface *intf;
459 int err;
460
461 if (ifnum >= 8*sizeof(ps->ifclaimed))
462 return -EINVAL;
463 /* already claimed */
464 if (test_bit(ifnum, &ps->ifclaimed))
465 return 0;
466
467 intf = usb_ifnum_to_if(dev, ifnum);
468 if (!intf)
469 err = -ENOENT;
470 else
471 err = usb_driver_claim_interface(&usbfs_driver, intf, ps);
472 if (err == 0)
473 set_bit(ifnum, &ps->ifclaimed);
474 return err;
475 }
476
477 static int releaseintf(struct dev_state *ps, unsigned int ifnum)
478 {
479 struct usb_device *dev;
480 struct usb_interface *intf;
481 int err;
482
483 err = -EINVAL;
484 if (ifnum >= 8*sizeof(ps->ifclaimed))
485 return err;
486 dev = ps->dev;
487 intf = usb_ifnum_to_if(dev, ifnum);
488 if (!intf)
489 err = -ENOENT;
490 else if (test_and_clear_bit(ifnum, &ps->ifclaimed)) {
491 usb_driver_release_interface(&usbfs_driver, intf);
492 err = 0;
493 }
494 return err;
495 }
496
497 static int checkintf(struct dev_state *ps, unsigned int ifnum)
498 {
499 if (ps->dev->state != USB_STATE_CONFIGURED)
500 return -EHOSTUNREACH;
501 if (ifnum >= 8*sizeof(ps->ifclaimed))
502 return -EINVAL;
503 if (test_bit(ifnum, &ps->ifclaimed))
504 return 0;
505 /* if not yet claimed, claim it for the driver */
506 dev_warn(&ps->dev->dev, "usbfs: process %d (%s) did not claim "
507 "interface %u before use\n", task_pid_nr(current),
508 current->comm, ifnum);
509 return claimintf(ps, ifnum);
510 }
511
512 static int findintfep(struct usb_device *dev, unsigned int ep)
513 {
514 unsigned int i, j, e;
515 struct usb_interface *intf;
516 struct usb_host_interface *alts;
517 struct usb_endpoint_descriptor *endpt;
518
519 if (ep & ~(USB_DIR_IN|0xf))
520 return -EINVAL;
521 if (!dev->actconfig)
522 return -ESRCH;
523 for (i = 0; i < dev->actconfig->desc.bNumInterfaces; i++) {
524 intf = dev->actconfig->interface[i];
525 for (j = 0; j < intf->num_altsetting; j++) {
526 alts = &intf->altsetting[j];
527 for (e = 0; e < alts->desc.bNumEndpoints; e++) {
528 endpt = &alts->endpoint[e].desc;
529 if (endpt->bEndpointAddress == ep)
530 return alts->desc.bInterfaceNumber;
531 }
532 }
533 }
534 return -ENOENT;
535 }
536
537 static int check_ctrlrecip(struct dev_state *ps, unsigned int requesttype,
538 unsigned int index)
539 {
540 int ret = 0;
541
542 if (ps->dev->state != USB_STATE_UNAUTHENTICATED
543 && ps->dev->state != USB_STATE_ADDRESS
544 && ps->dev->state != USB_STATE_CONFIGURED)
545 return -EHOSTUNREACH;
546 if (USB_TYPE_VENDOR == (USB_TYPE_MASK & requesttype))
547 return 0;
548
549 index &= 0xff;
550 switch (requesttype & USB_RECIP_MASK) {
551 case USB_RECIP_ENDPOINT:
552 ret = findintfep(ps->dev, index);
553 if (ret >= 0)
554 ret = checkintf(ps, ret);
555 break;
556
557 case USB_RECIP_INTERFACE:
558 ret = checkintf(ps, index);
559 break;
560 }
561 return ret;
562 }
563
564 static int match_devt(struct device *dev, void *data)
565 {
566 return dev->devt == (dev_t) (unsigned long) data;
567 }
568
569 static struct usb_device *usbdev_lookup_by_devt(dev_t devt)
570 {
571 struct device *dev;
572
573 dev = bus_find_device(&usb_bus_type, NULL,
574 (void *) (unsigned long) devt, match_devt);
575 if (!dev)
576 return NULL;
577 return container_of(dev, struct usb_device, dev);
578 }
579
580 /*
581 * file operations
582 */
583 static int usbdev_open(struct inode *inode, struct file *file)
584 {
585 struct usb_device *dev = NULL;
586 struct dev_state *ps;
587 const struct cred *cred = current_cred();
588 int ret;
589
590 lock_kernel();
591 /* Protect against simultaneous removal or release */
592 mutex_lock(&usbfs_mutex);
593
594 ret = -ENOMEM;
595 ps = kmalloc(sizeof(struct dev_state), GFP_KERNEL);
596 if (!ps)
597 goto out;
598
599 ret = -ENODEV;
600
601 /* usbdev device-node */
602 if (imajor(inode) == USB_DEVICE_MAJOR)
603 dev = usbdev_lookup_by_devt(inode->i_rdev);
604 #ifdef CONFIG_USB_DEVICEFS
605 /* procfs file */
606 if (!dev) {
607 dev = inode->i_private;
608 if (dev && dev->usbfs_dentry &&
609 dev->usbfs_dentry->d_inode == inode)
610 usb_get_dev(dev);
611 else
612 dev = NULL;
613 }
614 #endif
615 if (!dev || dev->state == USB_STATE_NOTATTACHED)
616 goto out;
617 ret = usb_autoresume_device(dev);
618 if (ret)
619 goto out;
620
621 ret = 0;
622 ps->dev = dev;
623 ps->file = file;
624 spin_lock_init(&ps->lock);
625 INIT_LIST_HEAD(&ps->list);
626 INIT_LIST_HEAD(&ps->async_pending);
627 INIT_LIST_HEAD(&ps->async_completed);
628 init_waitqueue_head(&ps->wait);
629 ps->discsignr = 0;
630 ps->disc_pid = get_pid(task_pid(current));
631 ps->disc_uid = cred->uid;
632 ps->disc_euid = cred->euid;
633 ps->disccontext = NULL;
634 ps->ifclaimed = 0;
635 security_task_getsecid(current, &ps->secid);
636 smp_wmb();
637 list_add_tail(&ps->list, &dev->filelist);
638 file->private_data = ps;
639 snoop(&dev->dev, "opened by process %d: %s\n", task_pid_nr(current),
640 current->comm);
641 out:
642 if (ret) {
643 kfree(ps);
644 usb_put_dev(dev);
645 }
646 mutex_unlock(&usbfs_mutex);
647 unlock_kernel();
648 return ret;
649 }
650
651 static int usbdev_release(struct inode *inode, struct file *file)
652 {
653 struct dev_state *ps = file->private_data;
654 struct usb_device *dev = ps->dev;
655 unsigned int ifnum;
656 struct async *as;
657
658 usb_lock_device(dev);
659 usb_hub_release_all_ports(dev, ps);
660
661 /* Protect against simultaneous open */
662 mutex_lock(&usbfs_mutex);
663 list_del_init(&ps->list);
664 mutex_unlock(&usbfs_mutex);
665
666 for (ifnum = 0; ps->ifclaimed && ifnum < 8*sizeof(ps->ifclaimed);
667 ifnum++) {
668 if (test_bit(ifnum, &ps->ifclaimed))
669 releaseintf(ps, ifnum);
670 }
671 destroy_all_async(ps);
672 usb_autosuspend_device(dev);
673 usb_unlock_device(dev);
674 usb_put_dev(dev);
675 put_pid(ps->disc_pid);
676
677 as = async_getcompleted(ps);
678 while (as) {
679 free_async(as);
680 as = async_getcompleted(ps);
681 }
682 kfree(ps);
683 return 0;
684 }
685
686 static int proc_control(struct dev_state *ps, void __user *arg)
687 {
688 struct usb_device *dev = ps->dev;
689 struct usbdevfs_ctrltransfer ctrl;
690 unsigned int tmo;
691 unsigned char *tbuf;
692 unsigned wLength;
693 int i, j, ret;
694
695 if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
696 return -EFAULT;
697 ret = check_ctrlrecip(ps, ctrl.bRequestType, ctrl.wIndex);
698 if (ret)
699 return ret;
700 wLength = ctrl.wLength; /* To suppress 64k PAGE_SIZE warning */
701 if (wLength > PAGE_SIZE)
702 return -EINVAL;
703 tbuf = (unsigned char *)__get_free_page(GFP_KERNEL);
704 if (!tbuf)
705 return -ENOMEM;
706 tmo = ctrl.timeout;
707 if (ctrl.bRequestType & 0x80) {
708 if (ctrl.wLength && !access_ok(VERIFY_WRITE, ctrl.data,
709 ctrl.wLength)) {
710 free_page((unsigned long)tbuf);
711 return -EINVAL;
712 }
713 snoop(&dev->dev, "control read: bRequest=%02x "
714 "bRrequestType=%02x wValue=%04x "
715 "wIndex=%04x wLength=%04x\n",
716 ctrl.bRequest, ctrl.bRequestType, ctrl.wValue,
717 ctrl.wIndex, ctrl.wLength);
718
719 usb_unlock_device(dev);
720 i = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), ctrl.bRequest,
721 ctrl.bRequestType, ctrl.wValue, ctrl.wIndex,
722 tbuf, ctrl.wLength, tmo);
723 usb_lock_device(dev);
724 if ((i > 0) && ctrl.wLength) {
725 if (usbfs_snoop) {
726 dev_info(&dev->dev, "control read: data ");
727 for (j = 0; j < i; ++j)
728 printk("%02x ", (u8)(tbuf)[j]);
729 printk("\n");
730 }
731 if (copy_to_user(ctrl.data, tbuf, i)) {
732 free_page((unsigned long)tbuf);
733 return -EFAULT;
734 }
735 }
736 } else {
737 if (ctrl.wLength) {
738 if (copy_from_user(tbuf, ctrl.data, ctrl.wLength)) {
739 free_page((unsigned long)tbuf);
740 return -EFAULT;
741 }
742 }
743 snoop(&dev->dev, "control write: bRequest=%02x "
744 "bRrequestType=%02x wValue=%04x "
745 "wIndex=%04x wLength=%04x\n",
746 ctrl.bRequest, ctrl.bRequestType, ctrl.wValue,
747 ctrl.wIndex, ctrl.wLength);
748 if (usbfs_snoop) {
749 dev_info(&dev->dev, "control write: data: ");
750 for (j = 0; j < ctrl.wLength; ++j)
751 printk("%02x ", (unsigned char)(tbuf)[j]);
752 printk("\n");
753 }
754 usb_unlock_device(dev);
755 i = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), ctrl.bRequest,
756 ctrl.bRequestType, ctrl.wValue, ctrl.wIndex,
757 tbuf, ctrl.wLength, tmo);
758 usb_lock_device(dev);
759 }
760 free_page((unsigned long)tbuf);
761 if (i < 0 && i != -EPIPE) {
762 dev_printk(KERN_DEBUG, &dev->dev, "usbfs: USBDEVFS_CONTROL "
763 "failed cmd %s rqt %u rq %u len %u ret %d\n",
764 current->comm, ctrl.bRequestType, ctrl.bRequest,
765 ctrl.wLength, i);
766 }
767 return i;
768 }
769
770 static int proc_bulk(struct dev_state *ps, void __user *arg)
771 {
772 struct usb_device *dev = ps->dev;
773 struct usbdevfs_bulktransfer bulk;
774 unsigned int tmo, len1, pipe;
775 int len2;
776 unsigned char *tbuf;
777 int i, j, ret;
778
779 if (copy_from_user(&bulk, arg, sizeof(bulk)))
780 return -EFAULT;
781 ret = findintfep(ps->dev, bulk.ep);
782 if (ret < 0)
783 return ret;
784 ret = checkintf(ps, ret);
785 if (ret)
786 return ret;
787 if (bulk.ep & USB_DIR_IN)
788 pipe = usb_rcvbulkpipe(dev, bulk.ep & 0x7f);
789 else
790 pipe = usb_sndbulkpipe(dev, bulk.ep & 0x7f);
791 if (!usb_maxpacket(dev, pipe, !(bulk.ep & USB_DIR_IN)))
792 return -EINVAL;
793 len1 = bulk.len;
794 if (len1 > MAX_USBFS_BUFFER_SIZE)
795 return -EINVAL;
796 if (!(tbuf = kmalloc(len1, GFP_KERNEL)))
797 return -ENOMEM;
798 tmo = bulk.timeout;
799 if (bulk.ep & 0x80) {
800 if (len1 && !access_ok(VERIFY_WRITE, bulk.data, len1)) {
801 kfree(tbuf);
802 return -EINVAL;
803 }
804 snoop(&dev->dev, "bulk read: len=0x%02x timeout=%04d\n",
805 bulk.len, bulk.timeout);
806 usb_unlock_device(dev);
807 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
808 usb_lock_device(dev);
809 if (!i && len2) {
810 if (usbfs_snoop) {
811 dev_info(&dev->dev, "bulk read: data ");
812 for (j = 0; j < len2; ++j)
813 printk("%02x ", (u8)(tbuf)[j]);
814 printk("\n");
815 }
816 if (copy_to_user(bulk.data, tbuf, len2)) {
817 kfree(tbuf);
818 return -EFAULT;
819 }
820 }
821 } else {
822 if (len1) {
823 if (copy_from_user(tbuf, bulk.data, len1)) {
824 kfree(tbuf);
825 return -EFAULT;
826 }
827 }
828 snoop(&dev->dev, "bulk write: len=0x%02x timeout=%04d\n",
829 bulk.len, bulk.timeout);
830 if (usbfs_snoop) {
831 dev_info(&dev->dev, "bulk write: data: ");
832 for (j = 0; j < len1; ++j)
833 printk("%02x ", (unsigned char)(tbuf)[j]);
834 printk("\n");
835 }
836 usb_unlock_device(dev);
837 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
838 usb_lock_device(dev);
839 }
840 kfree(tbuf);
841 if (i < 0)
842 return i;
843 return len2;
844 }
845
846 static int proc_resetep(struct dev_state *ps, void __user *arg)
847 {
848 unsigned int ep;
849 int ret;
850
851 if (get_user(ep, (unsigned int __user *)arg))
852 return -EFAULT;
853 ret = findintfep(ps->dev, ep);
854 if (ret < 0)
855 return ret;
856 ret = checkintf(ps, ret);
857 if (ret)
858 return ret;
859 usb_reset_endpoint(ps->dev, ep);
860 return 0;
861 }
862
863 static int proc_clearhalt(struct dev_state *ps, void __user *arg)
864 {
865 unsigned int ep;
866 int pipe;
867 int ret;
868
869 if (get_user(ep, (unsigned int __user *)arg))
870 return -EFAULT;
871 ret = findintfep(ps->dev, ep);
872 if (ret < 0)
873 return ret;
874 ret = checkintf(ps, ret);
875 if (ret)
876 return ret;
877 if (ep & USB_DIR_IN)
878 pipe = usb_rcvbulkpipe(ps->dev, ep & 0x7f);
879 else
880 pipe = usb_sndbulkpipe(ps->dev, ep & 0x7f);
881
882 return usb_clear_halt(ps->dev, pipe);
883 }
884
885 static int proc_getdriver(struct dev_state *ps, void __user *arg)
886 {
887 struct usbdevfs_getdriver gd;
888 struct usb_interface *intf;
889 int ret;
890
891 if (copy_from_user(&gd, arg, sizeof(gd)))
892 return -EFAULT;
893 intf = usb_ifnum_to_if(ps->dev, gd.interface);
894 if (!intf || !intf->dev.driver)
895 ret = -ENODATA;
896 else {
897 strncpy(gd.driver, intf->dev.driver->name,
898 sizeof(gd.driver));
899 ret = (copy_to_user(arg, &gd, sizeof(gd)) ? -EFAULT : 0);
900 }
901 return ret;
902 }
903
904 static int proc_connectinfo(struct dev_state *ps, void __user *arg)
905 {
906 struct usbdevfs_connectinfo ci;
907
908 ci.devnum = ps->dev->devnum;
909 ci.slow = ps->dev->speed == USB_SPEED_LOW;
910 if (copy_to_user(arg, &ci, sizeof(ci)))
911 return -EFAULT;
912 return 0;
913 }
914
915 static int proc_resetdevice(struct dev_state *ps)
916 {
917 return usb_reset_device(ps->dev);
918 }
919
920 static int proc_setintf(struct dev_state *ps, void __user *arg)
921 {
922 struct usbdevfs_setinterface setintf;
923 int ret;
924
925 if (copy_from_user(&setintf, arg, sizeof(setintf)))
926 return -EFAULT;
927 if ((ret = checkintf(ps, setintf.interface)))
928 return ret;
929 return usb_set_interface(ps->dev, setintf.interface,
930 setintf.altsetting);
931 }
932
933 static int proc_setconfig(struct dev_state *ps, void __user *arg)
934 {
935 int u;
936 int status = 0;
937 struct usb_host_config *actconfig;
938
939 if (get_user(u, (int __user *)arg))
940 return -EFAULT;
941
942 actconfig = ps->dev->actconfig;
943
944 /* Don't touch the device if any interfaces are claimed.
945 * It could interfere with other drivers' operations, and if
946 * an interface is claimed by usbfs it could easily deadlock.
947 */
948 if (actconfig) {
949 int i;
950
951 for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) {
952 if (usb_interface_claimed(actconfig->interface[i])) {
953 dev_warn(&ps->dev->dev,
954 "usbfs: interface %d claimed by %s "
955 "while '%s' sets config #%d\n",
956 actconfig->interface[i]
957 ->cur_altsetting
958 ->desc.bInterfaceNumber,
959 actconfig->interface[i]
960 ->dev.driver->name,
961 current->comm, u);
962 status = -EBUSY;
963 break;
964 }
965 }
966 }
967
968 /* SET_CONFIGURATION is often abused as a "cheap" driver reset,
969 * so avoid usb_set_configuration()'s kick to sysfs
970 */
971 if (status == 0) {
972 if (actconfig && actconfig->desc.bConfigurationValue == u)
973 status = usb_reset_configuration(ps->dev);
974 else
975 status = usb_set_configuration(ps->dev, u);
976 }
977
978 return status;
979 }
980
981 static int proc_do_submiturb(struct dev_state *ps, struct usbdevfs_urb *uurb,
982 struct usbdevfs_iso_packet_desc __user *iso_frame_desc,
983 void __user *arg)
984 {
985 struct usbdevfs_iso_packet_desc *isopkt = NULL;
986 struct usb_host_endpoint *ep;
987 struct async *as;
988 struct usb_ctrlrequest *dr = NULL;
989 const struct cred *cred = current_cred();
990 unsigned int u, totlen, isofrmlen;
991 int ret, ifnum = -1;
992 int is_in;
993
994 if (uurb->flags & ~(USBDEVFS_URB_ISO_ASAP |
995 USBDEVFS_URB_SHORT_NOT_OK |
996 USBDEVFS_URB_NO_FSBR |
997 USBDEVFS_URB_ZERO_PACKET |
998 USBDEVFS_URB_NO_INTERRUPT))
999 return -EINVAL;
1000 if (uurb->buffer_length > 0 && !uurb->buffer)
1001 return -EINVAL;
1002 if (!(uurb->type == USBDEVFS_URB_TYPE_CONTROL &&
1003 (uurb->endpoint & ~USB_ENDPOINT_DIR_MASK) == 0)) {
1004 ifnum = findintfep(ps->dev, uurb->endpoint);
1005 if (ifnum < 0)
1006 return ifnum;
1007 ret = checkintf(ps, ifnum);
1008 if (ret)
1009 return ret;
1010 }
1011 if ((uurb->endpoint & USB_ENDPOINT_DIR_MASK) != 0) {
1012 is_in = 1;
1013 ep = ps->dev->ep_in[uurb->endpoint & USB_ENDPOINT_NUMBER_MASK];
1014 } else {
1015 is_in = 0;
1016 ep = ps->dev->ep_out[uurb->endpoint & USB_ENDPOINT_NUMBER_MASK];
1017 }
1018 if (!ep)
1019 return -ENOENT;
1020 switch(uurb->type) {
1021 case USBDEVFS_URB_TYPE_CONTROL:
1022 if (!usb_endpoint_xfer_control(&ep->desc))
1023 return -EINVAL;
1024 /* min 8 byte setup packet,
1025 * max 8 byte setup plus an arbitrary data stage */
1026 if (uurb->buffer_length < 8 ||
1027 uurb->buffer_length > (8 + MAX_USBFS_BUFFER_SIZE))
1028 return -EINVAL;
1029 dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL);
1030 if (!dr)
1031 return -ENOMEM;
1032 if (copy_from_user(dr, uurb->buffer, 8)) {
1033 kfree(dr);
1034 return -EFAULT;
1035 }
1036 if (uurb->buffer_length < (le16_to_cpup(&dr->wLength) + 8)) {
1037 kfree(dr);
1038 return -EINVAL;
1039 }
1040 ret = check_ctrlrecip(ps, dr->bRequestType,
1041 le16_to_cpup(&dr->wIndex));
1042 if (ret) {
1043 kfree(dr);
1044 return ret;
1045 }
1046 uurb->number_of_packets = 0;
1047 uurb->buffer_length = le16_to_cpup(&dr->wLength);
1048 uurb->buffer += 8;
1049 if ((dr->bRequestType & USB_DIR_IN) && uurb->buffer_length) {
1050 is_in = 1;
1051 uurb->endpoint |= USB_DIR_IN;
1052 } else {
1053 is_in = 0;
1054 uurb->endpoint &= ~USB_DIR_IN;
1055 }
1056 snoop(&ps->dev->dev, "control urb: bRequest=%02x "
1057 "bRrequestType=%02x wValue=%04x "
1058 "wIndex=%04x wLength=%04x\n",
1059 dr->bRequest, dr->bRequestType,
1060 __le16_to_cpup(&dr->wValue),
1061 __le16_to_cpup(&dr->wIndex),
1062 __le16_to_cpup(&dr->wLength));
1063 break;
1064
1065 case USBDEVFS_URB_TYPE_BULK:
1066 switch (usb_endpoint_type(&ep->desc)) {
1067 case USB_ENDPOINT_XFER_CONTROL:
1068 case USB_ENDPOINT_XFER_ISOC:
1069 return -EINVAL;
1070 /* allow single-shot interrupt transfers, at bogus rates */
1071 }
1072 uurb->number_of_packets = 0;
1073 if (uurb->buffer_length > MAX_USBFS_BUFFER_SIZE)
1074 return -EINVAL;
1075 snoop(&ps->dev->dev, "bulk urb\n");
1076 break;
1077
1078 case USBDEVFS_URB_TYPE_ISO:
1079 /* arbitrary limit */
1080 if (uurb->number_of_packets < 1 ||
1081 uurb->number_of_packets > 128)
1082 return -EINVAL;
1083 if (!usb_endpoint_xfer_isoc(&ep->desc))
1084 return -EINVAL;
1085 isofrmlen = sizeof(struct usbdevfs_iso_packet_desc) *
1086 uurb->number_of_packets;
1087 if (!(isopkt = kmalloc(isofrmlen, GFP_KERNEL)))
1088 return -ENOMEM;
1089 if (copy_from_user(isopkt, iso_frame_desc, isofrmlen)) {
1090 kfree(isopkt);
1091 return -EFAULT;
1092 }
1093 for (totlen = u = 0; u < uurb->number_of_packets; u++) {
1094 /* arbitrary limit,
1095 * sufficient for USB 2.0 high-bandwidth iso */
1096 if (isopkt[u].length > 8192) {
1097 kfree(isopkt);
1098 return -EINVAL;
1099 }
1100 totlen += isopkt[u].length;
1101 }
1102 if (totlen > 32768) {
1103 kfree(isopkt);
1104 return -EINVAL;
1105 }
1106 uurb->buffer_length = totlen;
1107 snoop(&ps->dev->dev, "iso urb\n");
1108 break;
1109
1110 case USBDEVFS_URB_TYPE_INTERRUPT:
1111 uurb->number_of_packets = 0;
1112 if (!usb_endpoint_xfer_int(&ep->desc))
1113 return -EINVAL;
1114 if (uurb->buffer_length > MAX_USBFS_BUFFER_SIZE)
1115 return -EINVAL;
1116 snoop(&ps->dev->dev, "interrupt urb\n");
1117 break;
1118
1119 default:
1120 return -EINVAL;
1121 }
1122 if (uurb->buffer_length > 0 &&
1123 !access_ok(is_in ? VERIFY_WRITE : VERIFY_READ,
1124 uurb->buffer, uurb->buffer_length)) {
1125 kfree(isopkt);
1126 kfree(dr);
1127 return -EFAULT;
1128 }
1129 as = alloc_async(uurb->number_of_packets);
1130 if (!as) {
1131 kfree(isopkt);
1132 kfree(dr);
1133 return -ENOMEM;
1134 }
1135 if (uurb->buffer_length > 0) {
1136 as->urb->transfer_buffer = kmalloc(uurb->buffer_length,
1137 GFP_KERNEL);
1138 if (!as->urb->transfer_buffer) {
1139 kfree(isopkt);
1140 kfree(dr);
1141 free_async(as);
1142 return -ENOMEM;
1143 }
1144 }
1145 as->urb->dev = ps->dev;
1146 as->urb->pipe = (uurb->type << 30) |
1147 __create_pipe(ps->dev, uurb->endpoint & 0xf) |
1148 (uurb->endpoint & USB_DIR_IN);
1149
1150 /* This tedious sequence is necessary because the URB_* flags
1151 * are internal to the kernel and subject to change, whereas
1152 * the USBDEVFS_URB_* flags are a user API and must not be changed.
1153 */
1154 u = (is_in ? URB_DIR_IN : URB_DIR_OUT);
1155 if (uurb->flags & USBDEVFS_URB_ISO_ASAP)
1156 u |= URB_ISO_ASAP;
1157 if (uurb->flags & USBDEVFS_URB_SHORT_NOT_OK)
1158 u |= URB_SHORT_NOT_OK;
1159 if (uurb->flags & USBDEVFS_URB_NO_FSBR)
1160 u |= URB_NO_FSBR;
1161 if (uurb->flags & USBDEVFS_URB_ZERO_PACKET)
1162 u |= URB_ZERO_PACKET;
1163 if (uurb->flags & USBDEVFS_URB_NO_INTERRUPT)
1164 u |= URB_NO_INTERRUPT;
1165 as->urb->transfer_flags = u;
1166
1167 as->urb->transfer_buffer_length = uurb->buffer_length;
1168 as->urb->setup_packet = (unsigned char *)dr;
1169 as->urb->start_frame = uurb->start_frame;
1170 as->urb->number_of_packets = uurb->number_of_packets;
1171 if (uurb->type == USBDEVFS_URB_TYPE_ISO ||
1172 ps->dev->speed == USB_SPEED_HIGH)
1173 as->urb->interval = 1 << min(15, ep->desc.bInterval - 1);
1174 else
1175 as->urb->interval = ep->desc.bInterval;
1176 as->urb->context = as;
1177 as->urb->complete = async_completed;
1178 for (totlen = u = 0; u < uurb->number_of_packets; u++) {
1179 as->urb->iso_frame_desc[u].offset = totlen;
1180 as->urb->iso_frame_desc[u].length = isopkt[u].length;
1181 totlen += isopkt[u].length;
1182 }
1183 kfree(isopkt);
1184 as->ps = ps;
1185 as->userurb = arg;
1186 if (is_in && uurb->buffer_length > 0)
1187 as->userbuffer = uurb->buffer;
1188 else
1189 as->userbuffer = NULL;
1190 as->signr = uurb->signr;
1191 as->ifnum = ifnum;
1192 as->pid = get_pid(task_pid(current));
1193 as->uid = cred->uid;
1194 as->euid = cred->euid;
1195 security_task_getsecid(current, &as->secid);
1196 if (!is_in && uurb->buffer_length > 0) {
1197 if (copy_from_user(as->urb->transfer_buffer, uurb->buffer,
1198 uurb->buffer_length)) {
1199 free_async(as);
1200 return -EFAULT;
1201 }
1202 }
1203 snoop_urb(as->urb, as->userurb);
1204 async_newpending(as);
1205 if ((ret = usb_submit_urb(as->urb, GFP_KERNEL))) {
1206 dev_printk(KERN_DEBUG, &ps->dev->dev,
1207 "usbfs: usb_submit_urb returned %d\n", ret);
1208 async_removepending(as);
1209 free_async(as);
1210 return ret;
1211 }
1212 return 0;
1213 }
1214
1215 static int proc_submiturb(struct dev_state *ps, void __user *arg)
1216 {
1217 struct usbdevfs_urb uurb;
1218
1219 if (copy_from_user(&uurb, arg, sizeof(uurb)))
1220 return -EFAULT;
1221
1222 return proc_do_submiturb(ps, &uurb,
1223 (((struct usbdevfs_urb __user *)arg)->iso_frame_desc),
1224 arg);
1225 }
1226
1227 static int proc_unlinkurb(struct dev_state *ps, void __user *arg)
1228 {
1229 struct async *as;
1230
1231 as = async_getpending(ps, arg);
1232 if (!as)
1233 return -EINVAL;
1234 usb_kill_urb(as->urb);
1235 return 0;
1236 }
1237
1238 static int processcompl(struct async *as, void __user * __user *arg)
1239 {
1240 struct urb *urb = as->urb;
1241 struct usbdevfs_urb __user *userurb = as->userurb;
1242 void __user *addr = as->userurb;
1243 unsigned int i;
1244
1245 if (as->userbuffer)
1246 if (copy_to_user(as->userbuffer, urb->transfer_buffer,
1247 urb->transfer_buffer_length))
1248 goto err_out;
1249 if (put_user(as->status, &userurb->status))
1250 goto err_out;
1251 if (put_user(urb->actual_length, &userurb->actual_length))
1252 goto err_out;
1253 if (put_user(urb->error_count, &userurb->error_count))
1254 goto err_out;
1255
1256 if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
1257 for (i = 0; i < urb->number_of_packets; i++) {
1258 if (put_user(urb->iso_frame_desc[i].actual_length,
1259 &userurb->iso_frame_desc[i].actual_length))
1260 goto err_out;
1261 if (put_user(urb->iso_frame_desc[i].status,
1262 &userurb->iso_frame_desc[i].status))
1263 goto err_out;
1264 }
1265 }
1266
1267 free_async(as);
1268
1269 if (put_user(addr, (void __user * __user *)arg))
1270 return -EFAULT;
1271 return 0;
1272
1273 err_out:
1274 free_async(as);
1275 return -EFAULT;
1276 }
1277
1278 static struct async *reap_as(struct dev_state *ps)
1279 {
1280 DECLARE_WAITQUEUE(wait, current);
1281 struct async *as = NULL;
1282 struct usb_device *dev = ps->dev;
1283
1284 add_wait_queue(&ps->wait, &wait);
1285 for (;;) {
1286 __set_current_state(TASK_INTERRUPTIBLE);
1287 as = async_getcompleted(ps);
1288 if (as)
1289 break;
1290 if (signal_pending(current))
1291 break;
1292 usb_unlock_device(dev);
1293 schedule();
1294 usb_lock_device(dev);
1295 }
1296 remove_wait_queue(&ps->wait, &wait);
1297 set_current_state(TASK_RUNNING);
1298 return as;
1299 }
1300
1301 static int proc_reapurb(struct dev_state *ps, void __user *arg)
1302 {
1303 struct async *as = reap_as(ps);
1304 if (as)
1305 return processcompl(as, (void __user * __user *)arg);
1306 if (signal_pending(current))
1307 return -EINTR;
1308 return -EIO;
1309 }
1310
1311 static int proc_reapurbnonblock(struct dev_state *ps, void __user *arg)
1312 {
1313 struct async *as;
1314
1315 if (!(as = async_getcompleted(ps)))
1316 return -EAGAIN;
1317 return processcompl(as, (void __user * __user *)arg);
1318 }
1319
1320 #ifdef CONFIG_COMPAT
1321
1322 static int get_urb32(struct usbdevfs_urb *kurb,
1323 struct usbdevfs_urb32 __user *uurb)
1324 {
1325 __u32 uptr;
1326 if (!access_ok(VERIFY_READ, uurb, sizeof(*uurb)) ||
1327 __get_user(kurb->type, &uurb->type) ||
1328 __get_user(kurb->endpoint, &uurb->endpoint) ||
1329 __get_user(kurb->status, &uurb->status) ||
1330 __get_user(kurb->flags, &uurb->flags) ||
1331 __get_user(kurb->buffer_length, &uurb->buffer_length) ||
1332 __get_user(kurb->actual_length, &uurb->actual_length) ||
1333 __get_user(kurb->start_frame, &uurb->start_frame) ||
1334 __get_user(kurb->number_of_packets, &uurb->number_of_packets) ||
1335 __get_user(kurb->error_count, &uurb->error_count) ||
1336 __get_user(kurb->signr, &uurb->signr))
1337 return -EFAULT;
1338
1339 if (__get_user(uptr, &uurb->buffer))
1340 return -EFAULT;
1341 kurb->buffer = compat_ptr(uptr);
1342 if (__get_user(uptr, &uurb->usercontext))
1343 return -EFAULT;
1344 kurb->usercontext = compat_ptr(uptr);
1345
1346 return 0;
1347 }
1348
1349 static int proc_submiturb_compat(struct dev_state *ps, void __user *arg)
1350 {
1351 struct usbdevfs_urb uurb;
1352
1353 if (get_urb32(&uurb, (struct usbdevfs_urb32 __user *)arg))
1354 return -EFAULT;
1355
1356 return proc_do_submiturb(ps, &uurb,
1357 ((struct usbdevfs_urb32 __user *)arg)->iso_frame_desc,
1358 arg);
1359 }
1360
1361 static int processcompl_compat(struct async *as, void __user * __user *arg)
1362 {
1363 struct urb *urb = as->urb;
1364 struct usbdevfs_urb32 __user *userurb = as->userurb;
1365 void __user *addr = as->userurb;
1366 unsigned int i;
1367
1368 if (as->userbuffer)
1369 if (copy_to_user(as->userbuffer, urb->transfer_buffer,
1370 urb->transfer_buffer_length))
1371 return -EFAULT;
1372 if (put_user(as->status, &userurb->status))
1373 return -EFAULT;
1374 if (put_user(urb->actual_length, &userurb->actual_length))
1375 return -EFAULT;
1376 if (put_user(urb->error_count, &userurb->error_count))
1377 return -EFAULT;
1378
1379 if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
1380 for (i = 0; i < urb->number_of_packets; i++) {
1381 if (put_user(urb->iso_frame_desc[i].actual_length,
1382 &userurb->iso_frame_desc[i].actual_length))
1383 return -EFAULT;
1384 if (put_user(urb->iso_frame_desc[i].status,
1385 &userurb->iso_frame_desc[i].status))
1386 return -EFAULT;
1387 }
1388 }
1389
1390 free_async(as);
1391 if (put_user(ptr_to_compat(addr), (u32 __user *)arg))
1392 return -EFAULT;
1393 return 0;
1394 }
1395
1396 static int proc_reapurb_compat(struct dev_state *ps, void __user *arg)
1397 {
1398 struct async *as = reap_as(ps);
1399 if (as)
1400 return processcompl_compat(as, (void __user * __user *)arg);
1401 if (signal_pending(current))
1402 return -EINTR;
1403 return -EIO;
1404 }
1405
1406 static int proc_reapurbnonblock_compat(struct dev_state *ps, void __user *arg)
1407 {
1408 struct async *as;
1409
1410 if (!(as = async_getcompleted(ps)))
1411 return -EAGAIN;
1412 return processcompl_compat(as, (void __user * __user *)arg);
1413 }
1414
1415 #endif
1416
1417 static int proc_disconnectsignal(struct dev_state *ps, void __user *arg)
1418 {
1419 struct usbdevfs_disconnectsignal ds;
1420
1421 if (copy_from_user(&ds, arg, sizeof(ds)))
1422 return -EFAULT;
1423 ps->discsignr = ds.signr;
1424 ps->disccontext = ds.context;
1425 return 0;
1426 }
1427
1428 static int proc_claiminterface(struct dev_state *ps, void __user *arg)
1429 {
1430 unsigned int ifnum;
1431
1432 if (get_user(ifnum, (unsigned int __user *)arg))
1433 return -EFAULT;
1434 return claimintf(ps, ifnum);
1435 }
1436
1437 static int proc_releaseinterface(struct dev_state *ps, void __user *arg)
1438 {
1439 unsigned int ifnum;
1440 int ret;
1441
1442 if (get_user(ifnum, (unsigned int __user *)arg))
1443 return -EFAULT;
1444 if ((ret = releaseintf(ps, ifnum)) < 0)
1445 return ret;
1446 destroy_async_on_interface (ps, ifnum);
1447 return 0;
1448 }
1449
1450 static int proc_ioctl(struct dev_state *ps, struct usbdevfs_ioctl *ctl)
1451 {
1452 int size;
1453 void *buf = NULL;
1454 int retval = 0;
1455 struct usb_interface *intf = NULL;
1456 struct usb_driver *driver = NULL;
1457
1458 /* alloc buffer */
1459 if ((size = _IOC_SIZE(ctl->ioctl_code)) > 0) {
1460 if ((buf = kmalloc(size, GFP_KERNEL)) == NULL)
1461 return -ENOMEM;
1462 if ((_IOC_DIR(ctl->ioctl_code) & _IOC_WRITE)) {
1463 if (copy_from_user(buf, ctl->data, size)) {
1464 kfree(buf);
1465 return -EFAULT;
1466 }
1467 } else {
1468 memset(buf, 0, size);
1469 }
1470 }
1471
1472 if (!connected(ps)) {
1473 kfree(buf);
1474 return -ENODEV;
1475 }
1476
1477 if (ps->dev->state != USB_STATE_CONFIGURED)
1478 retval = -EHOSTUNREACH;
1479 else if (!(intf = usb_ifnum_to_if(ps->dev, ctl->ifno)))
1480 retval = -EINVAL;
1481 else switch (ctl->ioctl_code) {
1482
1483 /* disconnect kernel driver from interface */
1484 case USBDEVFS_DISCONNECT:
1485 if (intf->dev.driver) {
1486 driver = to_usb_driver(intf->dev.driver);
1487 dev_dbg(&intf->dev, "disconnect by usbfs\n");
1488 usb_driver_release_interface(driver, intf);
1489 } else
1490 retval = -ENODATA;
1491 break;
1492
1493 /* let kernel drivers try to (re)bind to the interface */
1494 case USBDEVFS_CONNECT:
1495 if (!intf->dev.driver)
1496 retval = device_attach(&intf->dev);
1497 else
1498 retval = -EBUSY;
1499 break;
1500
1501 /* talk directly to the interface's driver */
1502 default:
1503 if (intf->dev.driver)
1504 driver = to_usb_driver(intf->dev.driver);
1505 if (driver == NULL || driver->ioctl == NULL) {
1506 retval = -ENOTTY;
1507 } else {
1508 retval = driver->ioctl(intf, ctl->ioctl_code, buf);
1509 if (retval == -ENOIOCTLCMD)
1510 retval = -ENOTTY;
1511 }
1512 }
1513
1514 /* cleanup and return */
1515 if (retval >= 0
1516 && (_IOC_DIR(ctl->ioctl_code) & _IOC_READ) != 0
1517 && size > 0
1518 && copy_to_user(ctl->data, buf, size) != 0)
1519 retval = -EFAULT;
1520
1521 kfree(buf);
1522 return retval;
1523 }
1524
1525 static int proc_ioctl_default(struct dev_state *ps, void __user *arg)
1526 {
1527 struct usbdevfs_ioctl ctrl;
1528
1529 if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
1530 return -EFAULT;
1531 return proc_ioctl(ps, &ctrl);
1532 }
1533
1534 #ifdef CONFIG_COMPAT
1535 static int proc_ioctl_compat(struct dev_state *ps, compat_uptr_t arg)
1536 {
1537 struct usbdevfs_ioctl32 __user *uioc;
1538 struct usbdevfs_ioctl ctrl;
1539 u32 udata;
1540
1541 uioc = compat_ptr((long)arg);
1542 if (!access_ok(VERIFY_READ, uioc, sizeof(*uioc)) ||
1543 __get_user(ctrl.ifno, &uioc->ifno) ||
1544 __get_user(ctrl.ioctl_code, &uioc->ioctl_code) ||
1545 __get_user(udata, &uioc->data))
1546 return -EFAULT;
1547 ctrl.data = compat_ptr(udata);
1548
1549 return proc_ioctl(ps, &ctrl);
1550 }
1551 #endif
1552
1553 static int proc_claim_port(struct dev_state *ps, void __user *arg)
1554 {
1555 unsigned portnum;
1556 int rc;
1557
1558 if (get_user(portnum, (unsigned __user *) arg))
1559 return -EFAULT;
1560 rc = usb_hub_claim_port(ps->dev, portnum, ps);
1561 if (rc == 0)
1562 snoop(&ps->dev->dev, "port %d claimed by process %d: %s\n",
1563 portnum, task_pid_nr(current), current->comm);
1564 return rc;
1565 }
1566
1567 static int proc_release_port(struct dev_state *ps, void __user *arg)
1568 {
1569 unsigned portnum;
1570
1571 if (get_user(portnum, (unsigned __user *) arg))
1572 return -EFAULT;
1573 return usb_hub_release_port(ps->dev, portnum, ps);
1574 }
1575
1576 /*
1577 * NOTE: All requests here that have interface numbers as parameters
1578 * are assuming that somehow the configuration has been prevented from
1579 * changing. But there's no mechanism to ensure that...
1580 */
1581 static int usbdev_ioctl(struct inode *inode, struct file *file,
1582 unsigned int cmd, unsigned long arg)
1583 {
1584 struct dev_state *ps = file->private_data;
1585 struct usb_device *dev = ps->dev;
1586 void __user *p = (void __user *)arg;
1587 int ret = -ENOTTY;
1588
1589 if (!(file->f_mode & FMODE_WRITE))
1590 return -EPERM;
1591 usb_lock_device(dev);
1592 if (!connected(ps)) {
1593 usb_unlock_device(dev);
1594 return -ENODEV;
1595 }
1596
1597 switch (cmd) {
1598 case USBDEVFS_CONTROL:
1599 snoop(&dev->dev, "%s: CONTROL\n", __func__);
1600 ret = proc_control(ps, p);
1601 if (ret >= 0)
1602 inode->i_mtime = CURRENT_TIME;
1603 break;
1604
1605 case USBDEVFS_BULK:
1606 snoop(&dev->dev, "%s: BULK\n", __func__);
1607 ret = proc_bulk(ps, p);
1608 if (ret >= 0)
1609 inode->i_mtime = CURRENT_TIME;
1610 break;
1611
1612 case USBDEVFS_RESETEP:
1613 snoop(&dev->dev, "%s: RESETEP\n", __func__);
1614 ret = proc_resetep(ps, p);
1615 if (ret >= 0)
1616 inode->i_mtime = CURRENT_TIME;
1617 break;
1618
1619 case USBDEVFS_RESET:
1620 snoop(&dev->dev, "%s: RESET\n", __func__);
1621 ret = proc_resetdevice(ps);
1622 break;
1623
1624 case USBDEVFS_CLEAR_HALT:
1625 snoop(&dev->dev, "%s: CLEAR_HALT\n", __func__);
1626 ret = proc_clearhalt(ps, p);
1627 if (ret >= 0)
1628 inode->i_mtime = CURRENT_TIME;
1629 break;
1630
1631 case USBDEVFS_GETDRIVER:
1632 snoop(&dev->dev, "%s: GETDRIVER\n", __func__);
1633 ret = proc_getdriver(ps, p);
1634 break;
1635
1636 case USBDEVFS_CONNECTINFO:
1637 snoop(&dev->dev, "%s: CONNECTINFO\n", __func__);
1638 ret = proc_connectinfo(ps, p);
1639 break;
1640
1641 case USBDEVFS_SETINTERFACE:
1642 snoop(&dev->dev, "%s: SETINTERFACE\n", __func__);
1643 ret = proc_setintf(ps, p);
1644 break;
1645
1646 case USBDEVFS_SETCONFIGURATION:
1647 snoop(&dev->dev, "%s: SETCONFIGURATION\n", __func__);
1648 ret = proc_setconfig(ps, p);
1649 break;
1650
1651 case USBDEVFS_SUBMITURB:
1652 snoop(&dev->dev, "%s: SUBMITURB\n", __func__);
1653 ret = proc_submiturb(ps, p);
1654 if (ret >= 0)
1655 inode->i_mtime = CURRENT_TIME;
1656 break;
1657
1658 #ifdef CONFIG_COMPAT
1659
1660 case USBDEVFS_SUBMITURB32:
1661 snoop(&dev->dev, "%s: SUBMITURB32\n", __func__);
1662 ret = proc_submiturb_compat(ps, p);
1663 if (ret >= 0)
1664 inode->i_mtime = CURRENT_TIME;
1665 break;
1666
1667 case USBDEVFS_REAPURB32:
1668 snoop(&dev->dev, "%s: REAPURB32\n", __func__);
1669 ret = proc_reapurb_compat(ps, p);
1670 break;
1671
1672 case USBDEVFS_REAPURBNDELAY32:
1673 snoop(&dev->dev, "%s: REAPURBDELAY32\n", __func__);
1674 ret = proc_reapurbnonblock_compat(ps, p);
1675 break;
1676
1677 case USBDEVFS_IOCTL32:
1678 snoop(&dev->dev, "%s: IOCTL\n", __func__);
1679 ret = proc_ioctl_compat(ps, ptr_to_compat(p));
1680 break;
1681 #endif
1682
1683 case USBDEVFS_DISCARDURB:
1684 snoop(&dev->dev, "%s: DISCARDURB\n", __func__);
1685 ret = proc_unlinkurb(ps, p);
1686 break;
1687
1688 case USBDEVFS_REAPURB:
1689 snoop(&dev->dev, "%s: REAPURB\n", __func__);
1690 ret = proc_reapurb(ps, p);
1691 break;
1692
1693 case USBDEVFS_REAPURBNDELAY:
1694 snoop(&dev->dev, "%s: REAPURBDELAY\n", __func__);
1695 ret = proc_reapurbnonblock(ps, p);
1696 break;
1697
1698 case USBDEVFS_DISCSIGNAL:
1699 snoop(&dev->dev, "%s: DISCSIGNAL\n", __func__);
1700 ret = proc_disconnectsignal(ps, p);
1701 break;
1702
1703 case USBDEVFS_CLAIMINTERFACE:
1704 snoop(&dev->dev, "%s: CLAIMINTERFACE\n", __func__);
1705 ret = proc_claiminterface(ps, p);
1706 break;
1707
1708 case USBDEVFS_RELEASEINTERFACE:
1709 snoop(&dev->dev, "%s: RELEASEINTERFACE\n", __func__);
1710 ret = proc_releaseinterface(ps, p);
1711 break;
1712
1713 case USBDEVFS_IOCTL:
1714 snoop(&dev->dev, "%s: IOCTL\n", __func__);
1715 ret = proc_ioctl_default(ps, p);
1716 break;
1717
1718 case USBDEVFS_CLAIM_PORT:
1719 snoop(&dev->dev, "%s: CLAIM_PORT\n", __func__);
1720 ret = proc_claim_port(ps, p);
1721 break;
1722
1723 case USBDEVFS_RELEASE_PORT:
1724 snoop(&dev->dev, "%s: RELEASE_PORT\n", __func__);
1725 ret = proc_release_port(ps, p);
1726 break;
1727 }
1728 usb_unlock_device(dev);
1729 if (ret >= 0)
1730 inode->i_atime = CURRENT_TIME;
1731 return ret;
1732 }
1733
1734 /* No kernel lock - fine */
1735 static unsigned int usbdev_poll(struct file *file,
1736 struct poll_table_struct *wait)
1737 {
1738 struct dev_state *ps = file->private_data;
1739 unsigned int mask = 0;
1740
1741 poll_wait(file, &ps->wait, wait);
1742 if (file->f_mode & FMODE_WRITE && !list_empty(&ps->async_completed))
1743 mask |= POLLOUT | POLLWRNORM;
1744 if (!connected(ps))
1745 mask |= POLLERR | POLLHUP;
1746 return mask;
1747 }
1748
1749 const struct file_operations usbdev_file_operations = {
1750 .owner = THIS_MODULE,
1751 .llseek = usbdev_lseek,
1752 .read = usbdev_read,
1753 .poll = usbdev_poll,
1754 .ioctl = usbdev_ioctl,
1755 .open = usbdev_open,
1756 .release = usbdev_release,
1757 };
1758
1759 static void usbdev_remove(struct usb_device *udev)
1760 {
1761 struct dev_state *ps;
1762 struct siginfo sinfo;
1763
1764 while (!list_empty(&udev->filelist)) {
1765 ps = list_entry(udev->filelist.next, struct dev_state, list);
1766 destroy_all_async(ps);
1767 wake_up_all(&ps->wait);
1768 list_del_init(&ps->list);
1769 if (ps->discsignr) {
1770 sinfo.si_signo = ps->discsignr;
1771 sinfo.si_errno = EPIPE;
1772 sinfo.si_code = SI_ASYNCIO;
1773 sinfo.si_addr = ps->disccontext;
1774 kill_pid_info_as_uid(ps->discsignr, &sinfo,
1775 ps->disc_pid, ps->disc_uid,
1776 ps->disc_euid, ps->secid);
1777 }
1778 }
1779 }
1780
1781 #ifdef CONFIG_USB_DEVICE_CLASS
1782 static struct class *usb_classdev_class;
1783
1784 static int usb_classdev_add(struct usb_device *dev)
1785 {
1786 struct device *cldev;
1787
1788 cldev = device_create(usb_classdev_class, &dev->dev, dev->dev.devt,
1789 NULL, "usbdev%d.%d", dev->bus->busnum,
1790 dev->devnum);
1791 if (IS_ERR(cldev))
1792 return PTR_ERR(cldev);
1793 dev->usb_classdev = cldev;
1794 return 0;
1795 }
1796
1797 static void usb_classdev_remove(struct usb_device *dev)
1798 {
1799 if (dev->usb_classdev)
1800 device_unregister(dev->usb_classdev);
1801 }
1802
1803 #else
1804 #define usb_classdev_add(dev) 0
1805 #define usb_classdev_remove(dev) do {} while (0)
1806
1807 #endif
1808
1809 static int usbdev_notify(struct notifier_block *self,
1810 unsigned long action, void *dev)
1811 {
1812 switch (action) {
1813 case USB_DEVICE_ADD:
1814 if (usb_classdev_add(dev))
1815 return NOTIFY_BAD;
1816 break;
1817 case USB_DEVICE_REMOVE:
1818 usb_classdev_remove(dev);
1819 usbdev_remove(dev);
1820 break;
1821 }
1822 return NOTIFY_OK;
1823 }
1824
1825 static struct notifier_block usbdev_nb = {
1826 .notifier_call = usbdev_notify,
1827 };
1828
1829 static struct cdev usb_device_cdev;
1830
1831 int __init usb_devio_init(void)
1832 {
1833 int retval;
1834
1835 retval = register_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX,
1836 "usb_device");
1837 if (retval) {
1838 printk(KERN_ERR "Unable to register minors for usb_device\n");
1839 goto out;
1840 }
1841 cdev_init(&usb_device_cdev, &usbdev_file_operations);
1842 retval = cdev_add(&usb_device_cdev, USB_DEVICE_DEV, USB_DEVICE_MAX);
1843 if (retval) {
1844 printk(KERN_ERR "Unable to get usb_device major %d\n",
1845 USB_DEVICE_MAJOR);
1846 goto error_cdev;
1847 }
1848 #ifdef CONFIG_USB_DEVICE_CLASS
1849 usb_classdev_class = class_create(THIS_MODULE, "usb_device");
1850 if (IS_ERR(usb_classdev_class)) {
1851 printk(KERN_ERR "Unable to register usb_device class\n");
1852 retval = PTR_ERR(usb_classdev_class);
1853 cdev_del(&usb_device_cdev);
1854 usb_classdev_class = NULL;
1855 goto out;
1856 }
1857 /* devices of this class shadow the major:minor of their parent
1858 * device, so clear ->dev_kobj to prevent adding duplicate entries
1859 * to /sys/dev
1860 */
1861 usb_classdev_class->dev_kobj = NULL;
1862 #endif
1863 usb_register_notify(&usbdev_nb);
1864 out:
1865 return retval;
1866
1867 error_cdev:
1868 unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
1869 goto out;
1870 }
1871
1872 void usb_devio_cleanup(void)
1873 {
1874 usb_unregister_notify(&usbdev_nb);
1875 #ifdef CONFIG_USB_DEVICE_CLASS
1876 class_destroy(usb_classdev_class);
1877 #endif
1878 cdev_del(&usb_device_cdev);
1879 unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
1880 }
linux 2.6 git repository for openrd