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usbfs: simplify the lookup-by-minor routines
[linux-2.6/mini2440.git] / drivers / usb / core / devio.c
blob57bedcebf96c07884eeace55603e6784ff85d525
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
56 #define USB_MAXBUS 64
57 #define USB_DEVICE_MAX USB_MAXBUS * 128
58
59 /* Mutual exclusion for removal, open, and release */
60 DEFINE_MUTEX(usbfs_mutex);
61
62 struct dev_state {
63 struct list_head list; /* state list */
64 struct usb_device *dev;
65 struct file *file;
66 spinlock_t lock; /* protects the async urb lists */
67 struct list_head async_pending;
68 struct list_head async_completed;
69 wait_queue_head_t wait; /* wake up if a request completed */
70 unsigned int discsignr;
71 struct pid *disc_pid;
72 uid_t disc_uid, disc_euid;
73 void __user *disccontext;
74 unsigned long ifclaimed;
75 u32 secid;
76 };
77
78 struct async {
79 struct list_head asynclist;
80 struct dev_state *ps;
81 struct pid *pid;
82 uid_t uid, euid;
83 unsigned int signr;
84 unsigned int ifnum;
85 void __user *userbuffer;
86 void __user *userurb;
87 struct urb *urb;
88 int status;
89 u32 secid;
90 };
91
92 static int usbfs_snoop;
93 module_param(usbfs_snoop, bool, S_IRUGO | S_IWUSR);
94 MODULE_PARM_DESC(usbfs_snoop, "true to log all usbfs traffic");
95
96 #define snoop(dev, format, arg...) \
97 do { \
98 if (usbfs_snoop) \
99 dev_info(dev , format , ## arg); \
100 } while (0)
101
102 #define USB_DEVICE_DEV MKDEV(USB_DEVICE_MAJOR, 0)
103
104
105 #define MAX_USBFS_BUFFER_SIZE 16384
106
107 static inline int connected(struct dev_state *ps)
108 {
109 return (!list_empty(&ps->list) &&
110 ps->dev->state != USB_STATE_NOTATTACHED);
111 }
112
113 static loff_t usbdev_lseek(struct file *file, loff_t offset, int orig)
114 {
115 loff_t ret;
116
117 lock_kernel();
118
119 switch (orig) {
120 case 0:
121 file->f_pos = offset;
122 ret = file->f_pos;
123 break;
124 case 1:
125 file->f_pos += offset;
126 ret = file->f_pos;
127 break;
128 case 2:
129 default:
130 ret = -EINVAL;
131 }
132
133 unlock_kernel();
134 return ret;
135 }
136
137 static ssize_t usbdev_read(struct file *file, char __user *buf, size_t nbytes,
138 loff_t *ppos)
139 {
140 struct dev_state *ps = file->private_data;
141 struct usb_device *dev = ps->dev;
142 ssize_t ret = 0;
143 unsigned len;
144 loff_t pos;
145 int i;
146
147 pos = *ppos;
148 usb_lock_device(dev);
149 if (!connected(ps)) {
150 ret = -ENODEV;
151 goto err;
152 } else if (pos < 0) {
153 ret = -EINVAL;
154 goto err;
155 }
156
157 if (pos < sizeof(struct usb_device_descriptor)) {
158 /* 18 bytes - fits on the stack */
159 struct usb_device_descriptor temp_desc;
160
161 memcpy(&temp_desc, &dev->descriptor, sizeof(dev->descriptor));
162 le16_to_cpus(&temp_desc.bcdUSB);
163 le16_to_cpus(&temp_desc.idVendor);
164 le16_to_cpus(&temp_desc.idProduct);
165 le16_to_cpus(&temp_desc.bcdDevice);
166
167 len = sizeof(struct usb_device_descriptor) - pos;
168 if (len > nbytes)
169 len = nbytes;
170 if (copy_to_user(buf, ((char *)&temp_desc) + pos, len)) {
171 ret = -EFAULT;
172 goto err;
173 }
174
175 *ppos += len;
176 buf += len;
177 nbytes -= len;
178 ret += len;
179 }
180
181 pos = sizeof(struct usb_device_descriptor);
182 for (i = 0; nbytes && i < dev->descriptor.bNumConfigurations; i++) {
183 struct usb_config_descriptor *config =
184 (struct usb_config_descriptor *)dev->rawdescriptors[i];
185 unsigned int length = le16_to_cpu(config->wTotalLength);
186
187 if (*ppos < pos + length) {
188
189 /* The descriptor may claim to be longer than it
190 * really is. Here is the actual allocated length. */
191 unsigned alloclen =
192 le16_to_cpu(dev->config[i].desc.wTotalLength);
193
194 len = length - (*ppos - pos);
195 if (len > nbytes)
196 len = nbytes;
197
198 /* Simply don't write (skip over) unallocated parts */
199 if (alloclen > (*ppos - pos)) {
200 alloclen -= (*ppos - pos);
201 if (copy_to_user(buf,
202 dev->rawdescriptors[i] + (*ppos - pos),
203 min(len, alloclen))) {
204 ret = -EFAULT;
205 goto err;
206 }
207 }
208
209 *ppos += len;
210 buf += len;
211 nbytes -= len;
212 ret += len;
213 }
214
215 pos += length;
216 }
217
218 err:
219 usb_unlock_device(dev);
220 return ret;
221 }
222
223 /*
224 * async list handling
225 */
226
227 static struct async *alloc_async(unsigned int numisoframes)
228 {
229 struct async *as;
230
231 as = kzalloc(sizeof(struct async), GFP_KERNEL);
232 if (!as)
233 return NULL;
234 as->urb = usb_alloc_urb(numisoframes, GFP_KERNEL);
235 if (!as->urb) {
236 kfree(as);
237 return NULL;
238 }
239 return as;
240 }
241
242 static void free_async(struct async *as)
243 {
244 put_pid(as->pid);
245 kfree(as->urb->transfer_buffer);
246 kfree(as->urb->setup_packet);
247 usb_free_urb(as->urb);
248 kfree(as);
249 }
250
251 static inline void async_newpending(struct async *as)
252 {
253 struct dev_state *ps = as->ps;
254 unsigned long flags;
255
256 spin_lock_irqsave(&ps->lock, flags);
257 list_add_tail(&as->asynclist, &ps->async_pending);
258 spin_unlock_irqrestore(&ps->lock, flags);
259 }
260
261 static inline void async_removepending(struct async *as)
262 {
263 struct dev_state *ps = as->ps;
264 unsigned long flags;
265
266 spin_lock_irqsave(&ps->lock, flags);
267 list_del_init(&as->asynclist);
268 spin_unlock_irqrestore(&ps->lock, flags);
269 }
270
271 static inline struct async *async_getcompleted(struct dev_state *ps)
272 {
273 unsigned long flags;
274 struct async *as = NULL;
275
276 spin_lock_irqsave(&ps->lock, flags);
277 if (!list_empty(&ps->async_completed)) {
278 as = list_entry(ps->async_completed.next, struct async,
279 asynclist);
280 list_del_init(&as->asynclist);
281 }
282 spin_unlock_irqrestore(&ps->lock, flags);
283 return as;
284 }
285
286 static inline struct async *async_getpending(struct dev_state *ps,
287 void __user *userurb)
288 {
289 unsigned long flags;
290 struct async *as;
291
292 spin_lock_irqsave(&ps->lock, flags);
293 list_for_each_entry(as, &ps->async_pending, asynclist)
294 if (as->userurb == userurb) {
295 list_del_init(&as->asynclist);
296 spin_unlock_irqrestore(&ps->lock, flags);
297 return as;
298 }
299 spin_unlock_irqrestore(&ps->lock, flags);
300 return NULL;
301 }
302
303 static void snoop_urb(struct urb *urb, void __user *userurb)
304 {
305 int j;
306 unsigned char *data = urb->transfer_buffer;
307
308 if (!usbfs_snoop)
309 return;
310
311 dev_info(&urb->dev->dev, "direction=%s\n",
312 usb_urb_dir_in(urb) ? "IN" : "OUT");
313 dev_info(&urb->dev->dev, "userurb=%p\n", userurb);
314 dev_info(&urb->dev->dev, "transfer_buffer_length=%d\n",
315 urb->transfer_buffer_length);
316 dev_info(&urb->dev->dev, "actual_length=%d\n", urb->actual_length);
317 dev_info(&urb->dev->dev, "data: ");
318 for (j = 0; j < urb->transfer_buffer_length; ++j)
319 printk("%02x ", data[j]);
320 printk("\n");
321 }
322
323 static void async_completed(struct urb *urb)
324 {
325 struct async *as = urb->context;
326 struct dev_state *ps = as->ps;
327 struct siginfo sinfo;
328
329 spin_lock(&ps->lock);
330 list_move_tail(&as->asynclist, &ps->async_completed);
331 spin_unlock(&ps->lock);
332 as->status = urb->status;
333 if (as->signr) {
334 sinfo.si_signo = as->signr;
335 sinfo.si_errno = as->status;
336 sinfo.si_code = SI_ASYNCIO;
337 sinfo.si_addr = as->userurb;
338 kill_pid_info_as_uid(as->signr, &sinfo, as->pid, as->uid,
339 as->euid, as->secid);
340 }
341 snoop(&urb->dev->dev, "urb complete\n");
342 snoop_urb(urb, as->userurb);
343 wake_up(&ps->wait);
344 }
345
346 static void destroy_async(struct dev_state *ps, struct list_head *list)
347 {
348 struct async *as;
349 unsigned long flags;
350
351 spin_lock_irqsave(&ps->lock, flags);
352 while (!list_empty(list)) {
353 as = list_entry(list->next, struct async, asynclist);
354 list_del_init(&as->asynclist);
355
356 /* drop the spinlock so the completion handler can run */
357 spin_unlock_irqrestore(&ps->lock, flags);
358 usb_kill_urb(as->urb);
359 spin_lock_irqsave(&ps->lock, flags);
360 }
361 spin_unlock_irqrestore(&ps->lock, flags);
362 as = async_getcompleted(ps);
363 while (as) {
364 free_async(as);
365 as = async_getcompleted(ps);
366 }
367 }
368
369 static void destroy_async_on_interface(struct dev_state *ps,
370 unsigned int ifnum)
371 {
372 struct list_head *p, *q, hitlist;
373 unsigned long flags;
374
375 INIT_LIST_HEAD(&hitlist);
376 spin_lock_irqsave(&ps->lock, flags);
377 list_for_each_safe(p, q, &ps->async_pending)
378 if (ifnum == list_entry(p, struct async, asynclist)->ifnum)
379 list_move_tail(p, &hitlist);
380 spin_unlock_irqrestore(&ps->lock, flags);
381 destroy_async(ps, &hitlist);
382 }
383
384 static inline void destroy_all_async(struct dev_state *ps)
385 {
386 destroy_async(ps, &ps->async_pending);
387 }
388
389 /*
390 * interface claims are made only at the request of user level code,
391 * which can also release them (explicitly or by closing files).
392 * they're also undone when devices disconnect.
393 */
394
395 static int driver_probe(struct usb_interface *intf,
396 const struct usb_device_id *id)
397 {
398 return -ENODEV;
399 }
400
401 static void driver_disconnect(struct usb_interface *intf)
402 {
403 struct dev_state *ps = usb_get_intfdata(intf);
404 unsigned int ifnum = intf->altsetting->desc.bInterfaceNumber;
405
406 if (!ps)
407 return;
408
409 /* NOTE: this relies on usbcore having canceled and completed
410 * all pending I/O requests; 2.6 does that.
411 */
412
413 if (likely(ifnum < 8*sizeof(ps->ifclaimed)))
414 clear_bit(ifnum, &ps->ifclaimed);
415 else
416 warn("interface number %u out of range", ifnum);
417
418 usb_set_intfdata(intf, NULL);
419
420 /* force async requests to complete */
421 destroy_async_on_interface(ps, ifnum);
422 }
423
424 /* The following routines are merely placeholders. There is no way
425 * to inform a user task about suspend or resumes.
426 */
427 static int driver_suspend(struct usb_interface *intf, pm_message_t msg)
428 {
429 return 0;
430 }
431
432 static int driver_resume(struct usb_interface *intf)
433 {
434 return 0;
435 }
436
437 struct usb_driver usbfs_driver = {
438 .name = "usbfs",
439 .probe = driver_probe,
440 .disconnect = driver_disconnect,
441 .suspend = driver_suspend,
442 .resume = driver_resume,
443 };
444
445 static int claimintf(struct dev_state *ps, unsigned int ifnum)
446 {
447 struct usb_device *dev = ps->dev;
448 struct usb_interface *intf;
449 int err;
450
451 if (ifnum >= 8*sizeof(ps->ifclaimed))
452 return -EINVAL;
453 /* already claimed */
454 if (test_bit(ifnum, &ps->ifclaimed))
455 return 0;
456
457 intf = usb_ifnum_to_if(dev, ifnum);
458 if (!intf)
459 err = -ENOENT;
460 else
461 err = usb_driver_claim_interface(&usbfs_driver, intf, ps);
462 if (err == 0)
463 set_bit(ifnum, &ps->ifclaimed);
464 return err;
465 }
466
467 static int releaseintf(struct dev_state *ps, unsigned int ifnum)
468 {
469 struct usb_device *dev;
470 struct usb_interface *intf;
471 int err;
472
473 err = -EINVAL;
474 if (ifnum >= 8*sizeof(ps->ifclaimed))
475 return err;
476 dev = ps->dev;
477 intf = usb_ifnum_to_if(dev, ifnum);
478 if (!intf)
479 err = -ENOENT;
480 else if (test_and_clear_bit(ifnum, &ps->ifclaimed)) {
481 usb_driver_release_interface(&usbfs_driver, intf);
482 err = 0;
483 }
484 return err;
485 }
486
487 static int checkintf(struct dev_state *ps, unsigned int ifnum)
488 {
489 if (ps->dev->state != USB_STATE_CONFIGURED)
490 return -EHOSTUNREACH;
491 if (ifnum >= 8*sizeof(ps->ifclaimed))
492 return -EINVAL;
493 if (test_bit(ifnum, &ps->ifclaimed))
494 return 0;
495 /* if not yet claimed, claim it for the driver */
496 dev_warn(&ps->dev->dev, "usbfs: process %d (%s) did not claim "
497 "interface %u before use\n", task_pid_nr(current),
498 current->comm, ifnum);
499 return claimintf(ps, ifnum);
500 }
501
502 static int findintfep(struct usb_device *dev, unsigned int ep)
503 {
504 unsigned int i, j, e;
505 struct usb_interface *intf;
506 struct usb_host_interface *alts;
507 struct usb_endpoint_descriptor *endpt;
508
509 if (ep & ~(USB_DIR_IN|0xf))
510 return -EINVAL;
511 if (!dev->actconfig)
512 return -ESRCH;
513 for (i = 0; i < dev->actconfig->desc.bNumInterfaces; i++) {
514 intf = dev->actconfig->interface[i];
515 for (j = 0; j < intf->num_altsetting; j++) {
516 alts = &intf->altsetting[j];
517 for (e = 0; e < alts->desc.bNumEndpoints; e++) {
518 endpt = &alts->endpoint[e].desc;
519 if (endpt->bEndpointAddress == ep)
520 return alts->desc.bInterfaceNumber;
521 }
522 }
523 }
524 return -ENOENT;
525 }
526
527 static int check_ctrlrecip(struct dev_state *ps, unsigned int requesttype,
528 unsigned int index)
529 {
530 int ret = 0;
531
532 if (ps->dev->state != USB_STATE_ADDRESS
533 && ps->dev->state != USB_STATE_CONFIGURED)
534 return -EHOSTUNREACH;
535 if (USB_TYPE_VENDOR == (USB_TYPE_MASK & requesttype))
536 return 0;
537
538 index &= 0xff;
539 switch (requesttype & USB_RECIP_MASK) {
540 case USB_RECIP_ENDPOINT:
541 ret = findintfep(ps->dev, index);
542 if (ret >= 0)
543 ret = checkintf(ps, ret);
544 break;
545
546 case USB_RECIP_INTERFACE:
547 ret = checkintf(ps, index);
548 break;
549 }
550 return ret;
551 }
552
553 static int match_devt(struct device *dev, void *data)
554 {
555 return (dev->devt == (dev_t) data);
556 }
557
558 static struct usb_device *usbdev_lookup_by_devt(dev_t devt)
559 {
560 struct device *dev;
561
562 dev = bus_find_device(&usb_bus_type, NULL, (void *) devt, match_devt);
563 if (!dev)
564 return NULL;
565 put_device(dev);
566 return container_of(dev, struct usb_device, dev);
567 }
568
569 /*
570 * file operations
571 */
572 static int usbdev_open(struct inode *inode, struct file *file)
573 {
574 struct usb_device *dev = NULL;
575 struct dev_state *ps;
576 int ret;
577
578 lock_kernel();
579 /* Protect against simultaneous removal or release */
580 mutex_lock(&usbfs_mutex);
581
582 ret = -ENOMEM;
583 ps = kmalloc(sizeof(struct dev_state), GFP_KERNEL);
584 if (!ps)
585 goto out;
586
587 ret = -ENOENT;
588
589 /* usbdev device-node */
590 if (imajor(inode) == USB_DEVICE_MAJOR)
591 dev = usbdev_lookup_by_devt(inode->i_rdev);
592 #ifdef CONFIG_USB_DEVICEFS
593 /* procfs file */
594 if (!dev)
595 dev = inode->i_private;
596 #endif
597 if (!dev)
598 goto out;
599 ret = usb_autoresume_device(dev);
600 if (ret)
601 goto out;
602
603 usb_get_dev(dev);
604 ret = 0;
605 ps->dev = dev;
606 ps->file = file;
607 spin_lock_init(&ps->lock);
608 INIT_LIST_HEAD(&ps->list);
609 INIT_LIST_HEAD(&ps->async_pending);
610 INIT_LIST_HEAD(&ps->async_completed);
611 init_waitqueue_head(&ps->wait);
612 ps->discsignr = 0;
613 ps->disc_pid = get_pid(task_pid(current));
614 ps->disc_uid = current->uid;
615 ps->disc_euid = current->euid;
616 ps->disccontext = NULL;
617 ps->ifclaimed = 0;
618 security_task_getsecid(current, &ps->secid);
619 smp_wmb();
620 list_add_tail(&ps->list, &dev->filelist);
621 file->private_data = ps;
622 out:
623 if (ret)
624 kfree(ps);
625 mutex_unlock(&usbfs_mutex);
626 unlock_kernel();
627 return ret;
628 }
629
630 static int usbdev_release(struct inode *inode, struct file *file)
631 {
632 struct dev_state *ps = file->private_data;
633 struct usb_device *dev = ps->dev;
634 unsigned int ifnum;
635
636 usb_lock_device(dev);
637
638 /* Protect against simultaneous open */
639 mutex_lock(&usbfs_mutex);
640 list_del_init(&ps->list);
641 mutex_unlock(&usbfs_mutex);
642
643 for (ifnum = 0; ps->ifclaimed && ifnum < 8*sizeof(ps->ifclaimed);
644 ifnum++) {
645 if (test_bit(ifnum, &ps->ifclaimed))
646 releaseintf(ps, ifnum);
647 }
648 destroy_all_async(ps);
649 usb_autosuspend_device(dev);
650 usb_unlock_device(dev);
651 usb_put_dev(dev);
652 put_pid(ps->disc_pid);
653 kfree(ps);
654 return 0;
655 }
656
657 static int proc_control(struct dev_state *ps, void __user *arg)
658 {
659 struct usb_device *dev = ps->dev;
660 struct usbdevfs_ctrltransfer ctrl;
661 unsigned int tmo;
662 unsigned char *tbuf;
663 unsigned wLength;
664 int i, j, ret;
665
666 if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
667 return -EFAULT;
668 ret = check_ctrlrecip(ps, ctrl.bRequestType, ctrl.wIndex);
669 if (ret)
670 return ret;
671 wLength = ctrl.wLength; /* To suppress 64k PAGE_SIZE warning */
672 if (wLength > PAGE_SIZE)
673 return -EINVAL;
674 tbuf = (unsigned char *)__get_free_page(GFP_KERNEL);
675 if (!tbuf)
676 return -ENOMEM;
677 tmo = ctrl.timeout;
678 if (ctrl.bRequestType & 0x80) {
679 if (ctrl.wLength && !access_ok(VERIFY_WRITE, ctrl.data,
680 ctrl.wLength)) {
681 free_page((unsigned long)tbuf);
682 return -EINVAL;
683 }
684 snoop(&dev->dev, "control read: bRequest=%02x "
685 "bRrequestType=%02x wValue=%04x "
686 "wIndex=%04x wLength=%04x\n",
687 ctrl.bRequest, ctrl.bRequestType, ctrl.wValue,
688 ctrl.wIndex, ctrl.wLength);
689
690 usb_unlock_device(dev);
691 i = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), ctrl.bRequest,
692 ctrl.bRequestType, ctrl.wValue, ctrl.wIndex,
693 tbuf, ctrl.wLength, tmo);
694 usb_lock_device(dev);
695 if ((i > 0) && ctrl.wLength) {
696 if (usbfs_snoop) {
697 dev_info(&dev->dev, "control read: data ");
698 for (j = 0; j < i; ++j)
699 printk("%02x ", (u8)(tbuf)[j]);
700 printk("\n");
701 }
702 if (copy_to_user(ctrl.data, tbuf, i)) {
703 free_page((unsigned long)tbuf);
704 return -EFAULT;
705 }
706 }
707 } else {
708 if (ctrl.wLength) {
709 if (copy_from_user(tbuf, ctrl.data, ctrl.wLength)) {
710 free_page((unsigned long)tbuf);
711 return -EFAULT;
712 }
713 }
714 snoop(&dev->dev, "control write: bRequest=%02x "
715 "bRrequestType=%02x wValue=%04x "
716 "wIndex=%04x wLength=%04x\n",
717 ctrl.bRequest, ctrl.bRequestType, ctrl.wValue,
718 ctrl.wIndex, ctrl.wLength);
719 if (usbfs_snoop) {
720 dev_info(&dev->dev, "control write: data: ");
721 for (j = 0; j < ctrl.wLength; ++j)
722 printk("%02x ", (unsigned char)(tbuf)[j]);
723 printk("\n");
724 }
725 usb_unlock_device(dev);
726 i = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), ctrl.bRequest,
727 ctrl.bRequestType, ctrl.wValue, ctrl.wIndex,
728 tbuf, ctrl.wLength, tmo);
729 usb_lock_device(dev);
730 }
731 free_page((unsigned long)tbuf);
732 if (i < 0 && i != -EPIPE) {
733 dev_printk(KERN_DEBUG, &dev->dev, "usbfs: USBDEVFS_CONTROL "
734 "failed cmd %s rqt %u rq %u len %u ret %d\n",
735 current->comm, ctrl.bRequestType, ctrl.bRequest,
736 ctrl.wLength, i);
737 }
738 return i;
739 }
740
741 static int proc_bulk(struct dev_state *ps, void __user *arg)
742 {
743 struct usb_device *dev = ps->dev;
744 struct usbdevfs_bulktransfer bulk;
745 unsigned int tmo, len1, pipe;
746 int len2;
747 unsigned char *tbuf;
748 int i, j, ret;
749
750 if (copy_from_user(&bulk, arg, sizeof(bulk)))
751 return -EFAULT;
752 ret = findintfep(ps->dev, bulk.ep);
753 if (ret < 0)
754 return ret;
755 ret = checkintf(ps, ret);
756 if (ret)
757 return ret;
758 if (bulk.ep & USB_DIR_IN)
759 pipe = usb_rcvbulkpipe(dev, bulk.ep & 0x7f);
760 else
761 pipe = usb_sndbulkpipe(dev, bulk.ep & 0x7f);
762 if (!usb_maxpacket(dev, pipe, !(bulk.ep & USB_DIR_IN)))
763 return -EINVAL;
764 len1 = bulk.len;
765 if (len1 > MAX_USBFS_BUFFER_SIZE)
766 return -EINVAL;
767 if (!(tbuf = kmalloc(len1, GFP_KERNEL)))
768 return -ENOMEM;
769 tmo = bulk.timeout;
770 if (bulk.ep & 0x80) {
771 if (len1 && !access_ok(VERIFY_WRITE, bulk.data, len1)) {
772 kfree(tbuf);
773 return -EINVAL;
774 }
775 snoop(&dev->dev, "bulk read: len=0x%02x timeout=%04d\n",
776 bulk.len, bulk.timeout);
777 usb_unlock_device(dev);
778 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
779 usb_lock_device(dev);
780 if (!i && len2) {
781 if (usbfs_snoop) {
782 dev_info(&dev->dev, "bulk read: data ");
783 for (j = 0; j < len2; ++j)
784 printk("%02x ", (u8)(tbuf)[j]);
785 printk("\n");
786 }
787 if (copy_to_user(bulk.data, tbuf, len2)) {
788 kfree(tbuf);
789 return -EFAULT;
790 }
791 }
792 } else {
793 if (len1) {
794 if (copy_from_user(tbuf, bulk.data, len1)) {
795 kfree(tbuf);
796 return -EFAULT;
797 }
798 }
799 snoop(&dev->dev, "bulk write: len=0x%02x timeout=%04d\n",
800 bulk.len, bulk.timeout);
801 if (usbfs_snoop) {
802 dev_info(&dev->dev, "bulk write: data: ");
803 for (j = 0; j < len1; ++j)
804 printk("%02x ", (unsigned char)(tbuf)[j]);
805 printk("\n");
806 }
807 usb_unlock_device(dev);
808 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
809 usb_lock_device(dev);
810 }
811 kfree(tbuf);
812 if (i < 0)
813 return i;
814 return len2;
815 }
816
817 static int proc_resetep(struct dev_state *ps, void __user *arg)
818 {
819 unsigned int ep;
820 int ret;
821
822 if (get_user(ep, (unsigned int __user *)arg))
823 return -EFAULT;
824 ret = findintfep(ps->dev, ep);
825 if (ret < 0)
826 return ret;
827 ret = checkintf(ps, ret);
828 if (ret)
829 return ret;
830 usb_settoggle(ps->dev, ep & 0xf, !(ep & USB_DIR_IN), 0);
831 return 0;
832 }
833
834 static int proc_clearhalt(struct dev_state *ps, void __user *arg)
835 {
836 unsigned int ep;
837 int pipe;
838 int ret;
839
840 if (get_user(ep, (unsigned int __user *)arg))
841 return -EFAULT;
842 ret = findintfep(ps->dev, ep);
843 if (ret < 0)
844 return ret;
845 ret = checkintf(ps, ret);
846 if (ret)
847 return ret;
848 if (ep & USB_DIR_IN)
849 pipe = usb_rcvbulkpipe(ps->dev, ep & 0x7f);
850 else
851 pipe = usb_sndbulkpipe(ps->dev, ep & 0x7f);
852
853 return usb_clear_halt(ps->dev, pipe);
854 }
855
856 static int proc_getdriver(struct dev_state *ps, void __user *arg)
857 {
858 struct usbdevfs_getdriver gd;
859 struct usb_interface *intf;
860 int ret;
861
862 if (copy_from_user(&gd, arg, sizeof(gd)))
863 return -EFAULT;
864 intf = usb_ifnum_to_if(ps->dev, gd.interface);
865 if (!intf || !intf->dev.driver)
866 ret = -ENODATA;
867 else {
868 strncpy(gd.driver, intf->dev.driver->name,
869 sizeof(gd.driver));
870 ret = (copy_to_user(arg, &gd, sizeof(gd)) ? -EFAULT : 0);
871 }
872 return ret;
873 }
874
875 static int proc_connectinfo(struct dev_state *ps, void __user *arg)
876 {
877 struct usbdevfs_connectinfo ci;
878
879 ci.devnum = ps->dev->devnum;
880 ci.slow = ps->dev->speed == USB_SPEED_LOW;
881 if (copy_to_user(arg, &ci, sizeof(ci)))
882 return -EFAULT;
883 return 0;
884 }
885
886 static int proc_resetdevice(struct dev_state *ps)
887 {
888 return usb_reset_device(ps->dev);
889 }
890
891 static int proc_setintf(struct dev_state *ps, void __user *arg)
892 {
893 struct usbdevfs_setinterface setintf;
894 int ret;
895
896 if (copy_from_user(&setintf, arg, sizeof(setintf)))
897 return -EFAULT;
898 if ((ret = checkintf(ps, setintf.interface)))
899 return ret;
900 return usb_set_interface(ps->dev, setintf.interface,
901 setintf.altsetting);
902 }
903
904 static int proc_setconfig(struct dev_state *ps, void __user *arg)
905 {
906 int u;
907 int status = 0;
908 struct usb_host_config *actconfig;
909
910 if (get_user(u, (int __user *)arg))
911 return -EFAULT;
912
913 actconfig = ps->dev->actconfig;
914
915 /* Don't touch the device if any interfaces are claimed.
916 * It could interfere with other drivers' operations, and if
917 * an interface is claimed by usbfs it could easily deadlock.
918 */
919 if (actconfig) {
920 int i;
921
922 for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) {
923 if (usb_interface_claimed(actconfig->interface[i])) {
924 dev_warn(&ps->dev->dev,
925 "usbfs: interface %d claimed by %s "
926 "while '%s' sets config #%d\n",
927 actconfig->interface[i]
928 ->cur_altsetting
929 ->desc.bInterfaceNumber,
930 actconfig->interface[i]
931 ->dev.driver->name,
932 current->comm, u);
933 status = -EBUSY;
934 break;
935 }
936 }
937 }
938
939 /* SET_CONFIGURATION is often abused as a "cheap" driver reset,
940 * so avoid usb_set_configuration()'s kick to sysfs
941 */
942 if (status == 0) {
943 if (actconfig && actconfig->desc.bConfigurationValue == u)
944 status = usb_reset_configuration(ps->dev);
945 else
946 status = usb_set_configuration(ps->dev, u);
947 }
948
949 return status;
950 }
951
952 static int proc_do_submiturb(struct dev_state *ps, struct usbdevfs_urb *uurb,
953 struct usbdevfs_iso_packet_desc __user *iso_frame_desc,
954 void __user *arg)
955 {
956 struct usbdevfs_iso_packet_desc *isopkt = NULL;
957 struct usb_host_endpoint *ep;
958 struct async *as;
959 struct usb_ctrlrequest *dr = NULL;
960 unsigned int u, totlen, isofrmlen;
961 int ret, ifnum = -1;
962 int is_in;
963
964 if (uurb->flags & ~(USBDEVFS_URB_ISO_ASAP |
965 USBDEVFS_URB_SHORT_NOT_OK |
966 USBDEVFS_URB_NO_FSBR |
967 USBDEVFS_URB_ZERO_PACKET |
968 USBDEVFS_URB_NO_INTERRUPT))
969 return -EINVAL;
970 if (!uurb->buffer)
971 return -EINVAL;
972 if (uurb->signr != 0 && (uurb->signr < SIGRTMIN ||
973 uurb->signr > SIGRTMAX))
974 return -EINVAL;
975 if (!(uurb->type == USBDEVFS_URB_TYPE_CONTROL &&
976 (uurb->endpoint & ~USB_ENDPOINT_DIR_MASK) == 0)) {
977 ifnum = findintfep(ps->dev, uurb->endpoint);
978 if (ifnum < 0)
979 return ifnum;
980 ret = checkintf(ps, ifnum);
981 if (ret)
982 return ret;
983 }
984 if ((uurb->endpoint & USB_ENDPOINT_DIR_MASK) != 0) {
985 is_in = 1;
986 ep = ps->dev->ep_in[uurb->endpoint & USB_ENDPOINT_NUMBER_MASK];
987 } else {
988 is_in = 0;
989 ep = ps->dev->ep_out[uurb->endpoint & USB_ENDPOINT_NUMBER_MASK];
990 }
991 if (!ep)
992 return -ENOENT;
993 switch(uurb->type) {
994 case USBDEVFS_URB_TYPE_CONTROL:
995 if (!usb_endpoint_xfer_control(&ep->desc))
996 return -EINVAL;
997 /* min 8 byte setup packet,
998 * max 8 byte setup plus an arbitrary data stage */
999 if (uurb->buffer_length < 8 ||
1000 uurb->buffer_length > (8 + MAX_USBFS_BUFFER_SIZE))
1001 return -EINVAL;
1002 dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL);
1003 if (!dr)
1004 return -ENOMEM;
1005 if (copy_from_user(dr, uurb->buffer, 8)) {
1006 kfree(dr);
1007 return -EFAULT;
1008 }
1009 if (uurb->buffer_length < (le16_to_cpup(&dr->wLength) + 8)) {
1010 kfree(dr);
1011 return -EINVAL;
1012 }
1013 ret = check_ctrlrecip(ps, dr->bRequestType,
1014 le16_to_cpup(&dr->wIndex));
1015 if (ret) {
1016 kfree(dr);
1017 return ret;
1018 }
1019 uurb->number_of_packets = 0;
1020 uurb->buffer_length = le16_to_cpup(&dr->wLength);
1021 uurb->buffer += 8;
1022 if ((dr->bRequestType & USB_DIR_IN) && uurb->buffer_length) {
1023 is_in = 1;
1024 uurb->endpoint |= USB_DIR_IN;
1025 } else {
1026 is_in = 0;
1027 uurb->endpoint &= ~USB_DIR_IN;
1028 }
1029 if (!access_ok(is_in ? VERIFY_WRITE : VERIFY_READ,
1030 uurb->buffer, uurb->buffer_length)) {
1031 kfree(dr);
1032 return -EFAULT;
1033 }
1034 snoop(&ps->dev->dev, "control urb: bRequest=%02x "
1035 "bRrequestType=%02x wValue=%04x "
1036 "wIndex=%04x wLength=%04x\n",
1037 dr->bRequest, dr->bRequestType,
1038 __le16_to_cpup(&dr->wValue),
1039 __le16_to_cpup(&dr->wIndex),
1040 __le16_to_cpup(&dr->wLength));
1041 break;
1042
1043 case USBDEVFS_URB_TYPE_BULK:
1044 switch (usb_endpoint_type(&ep->desc)) {
1045 case USB_ENDPOINT_XFER_CONTROL:
1046 case USB_ENDPOINT_XFER_ISOC:
1047 return -EINVAL;
1048 /* allow single-shot interrupt transfers, at bogus rates */
1049 }
1050 uurb->number_of_packets = 0;
1051 if (uurb->buffer_length > MAX_USBFS_BUFFER_SIZE)
1052 return -EINVAL;
1053 if (!access_ok(is_in ? VERIFY_WRITE : VERIFY_READ,
1054 uurb->buffer, uurb->buffer_length))
1055 return -EFAULT;
1056 snoop(&ps->dev->dev, "bulk urb\n");
1057 break;
1058
1059 case USBDEVFS_URB_TYPE_ISO:
1060 /* arbitrary limit */
1061 if (uurb->number_of_packets < 1 ||
1062 uurb->number_of_packets > 128)
1063 return -EINVAL;
1064 if (!usb_endpoint_xfer_isoc(&ep->desc))
1065 return -EINVAL;
1066 isofrmlen = sizeof(struct usbdevfs_iso_packet_desc) *
1067 uurb->number_of_packets;
1068 if (!(isopkt = kmalloc(isofrmlen, GFP_KERNEL)))
1069 return -ENOMEM;
1070 if (copy_from_user(isopkt, iso_frame_desc, isofrmlen)) {
1071 kfree(isopkt);
1072 return -EFAULT;
1073 }
1074 for (totlen = u = 0; u < uurb->number_of_packets; u++) {
1075 /* arbitrary limit,
1076 * sufficient for USB 2.0 high-bandwidth iso */
1077 if (isopkt[u].length > 8192) {
1078 kfree(isopkt);
1079 return -EINVAL;
1080 }
1081 totlen += isopkt[u].length;
1082 }
1083 if (totlen > 32768) {
1084 kfree(isopkt);
1085 return -EINVAL;
1086 }
1087 uurb->buffer_length = totlen;
1088 snoop(&ps->dev->dev, "iso urb\n");
1089 break;
1090
1091 case USBDEVFS_URB_TYPE_INTERRUPT:
1092 uurb->number_of_packets = 0;
1093 if (!usb_endpoint_xfer_int(&ep->desc))
1094 return -EINVAL;
1095 if (uurb->buffer_length > MAX_USBFS_BUFFER_SIZE)
1096 return -EINVAL;
1097 if (!access_ok(is_in ? VERIFY_WRITE : VERIFY_READ,
1098 uurb->buffer, uurb->buffer_length))
1099 return -EFAULT;
1100 snoop(&ps->dev->dev, "interrupt urb\n");
1101 break;
1102
1103 default:
1104 return -EINVAL;
1105 }
1106 as = alloc_async(uurb->number_of_packets);
1107 if (!as) {
1108 kfree(isopkt);
1109 kfree(dr);
1110 return -ENOMEM;
1111 }
1112 as->urb->transfer_buffer = kmalloc(uurb->buffer_length, GFP_KERNEL);
1113 if (!as->urb->transfer_buffer) {
1114 kfree(isopkt);
1115 kfree(dr);
1116 free_async(as);
1117 return -ENOMEM;
1118 }
1119 as->urb->dev = ps->dev;
1120 as->urb->pipe = (uurb->type << 30) |
1121 __create_pipe(ps->dev, uurb->endpoint & 0xf) |
1122 (uurb->endpoint & USB_DIR_IN);
1123
1124 /* This tedious sequence is necessary because the URB_* flags
1125 * are internal to the kernel and subject to change, whereas
1126 * the USBDEVFS_URB_* flags are a user API and must not be changed.
1127 */
1128 u = (is_in ? URB_DIR_IN : URB_DIR_OUT);
1129 if (uurb->flags & USBDEVFS_URB_ISO_ASAP)
1130 u |= URB_ISO_ASAP;
1131 if (uurb->flags & USBDEVFS_URB_SHORT_NOT_OK)
1132 u |= URB_SHORT_NOT_OK;
1133 if (uurb->flags & USBDEVFS_URB_NO_FSBR)
1134 u |= URB_NO_FSBR;
1135 if (uurb->flags & USBDEVFS_URB_ZERO_PACKET)
1136 u |= URB_ZERO_PACKET;
1137 if (uurb->flags & USBDEVFS_URB_NO_INTERRUPT)
1138 u |= URB_NO_INTERRUPT;
1139 as->urb->transfer_flags = u;
1140
1141 as->urb->transfer_buffer_length = uurb->buffer_length;
1142 as->urb->setup_packet = (unsigned char *)dr;
1143 as->urb->start_frame = uurb->start_frame;
1144 as->urb->number_of_packets = uurb->number_of_packets;
1145 if (uurb->type == USBDEVFS_URB_TYPE_ISO ||
1146 ps->dev->speed == USB_SPEED_HIGH)
1147 as->urb->interval = 1 << min(15, ep->desc.bInterval - 1);
1148 else
1149 as->urb->interval = ep->desc.bInterval;
1150 as->urb->context = as;
1151 as->urb->complete = async_completed;
1152 for (totlen = u = 0; u < uurb->number_of_packets; u++) {
1153 as->urb->iso_frame_desc[u].offset = totlen;
1154 as->urb->iso_frame_desc[u].length = isopkt[u].length;
1155 totlen += isopkt[u].length;
1156 }
1157 kfree(isopkt);
1158 as->ps = ps;
1159 as->userurb = arg;
1160 if (uurb->endpoint & USB_DIR_IN)
1161 as->userbuffer = uurb->buffer;
1162 else
1163 as->userbuffer = NULL;
1164 as->signr = uurb->signr;
1165 as->ifnum = ifnum;
1166 as->pid = get_pid(task_pid(current));
1167 as->uid = current->uid;
1168 as->euid = current->euid;
1169 security_task_getsecid(current, &as->secid);
1170 if (!is_in) {
1171 if (copy_from_user(as->urb->transfer_buffer, uurb->buffer,
1172 as->urb->transfer_buffer_length)) {
1173 free_async(as);
1174 return -EFAULT;
1175 }
1176 }
1177 snoop_urb(as->urb, as->userurb);
1178 async_newpending(as);
1179 if ((ret = usb_submit_urb(as->urb, GFP_KERNEL))) {
1180 dev_printk(KERN_DEBUG, &ps->dev->dev,
1181 "usbfs: usb_submit_urb returned %d\n", ret);
1182 async_removepending(as);
1183 free_async(as);
1184 return ret;
1185 }
1186 return 0;
1187 }
1188
1189 static int proc_submiturb(struct dev_state *ps, void __user *arg)
1190 {
1191 struct usbdevfs_urb uurb;
1192
1193 if (copy_from_user(&uurb, arg, sizeof(uurb)))
1194 return -EFAULT;
1195
1196 return proc_do_submiturb(ps, &uurb,
1197 (((struct usbdevfs_urb __user *)arg)->iso_frame_desc),
1198 arg);
1199 }
1200
1201 static int proc_unlinkurb(struct dev_state *ps, void __user *arg)
1202 {
1203 struct async *as;
1204
1205 as = async_getpending(ps, arg);
1206 if (!as)
1207 return -EINVAL;
1208 usb_kill_urb(as->urb);
1209 return 0;
1210 }
1211
1212 static int processcompl(struct async *as, void __user * __user *arg)
1213 {
1214 struct urb *urb = as->urb;
1215 struct usbdevfs_urb __user *userurb = as->userurb;
1216 void __user *addr = as->userurb;
1217 unsigned int i;
1218
1219 if (as->userbuffer)
1220 if (copy_to_user(as->userbuffer, urb->transfer_buffer,
1221 urb->transfer_buffer_length))
1222 return -EFAULT;
1223 if (put_user(as->status, &userurb->status))
1224 return -EFAULT;
1225 if (put_user(urb->actual_length, &userurb->actual_length))
1226 return -EFAULT;
1227 if (put_user(urb->error_count, &userurb->error_count))
1228 return -EFAULT;
1229
1230 if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
1231 for (i = 0; i < urb->number_of_packets; i++) {
1232 if (put_user(urb->iso_frame_desc[i].actual_length,
1233 &userurb->iso_frame_desc[i].actual_length))
1234 return -EFAULT;
1235 if (put_user(urb->iso_frame_desc[i].status,
1236 &userurb->iso_frame_desc[i].status))
1237 return -EFAULT;
1238 }
1239 }
1240
1241 free_async(as);
1242
1243 if (put_user(addr, (void __user * __user *)arg))
1244 return -EFAULT;
1245 return 0;
1246 }
1247
1248 static struct async *reap_as(struct dev_state *ps)
1249 {
1250 DECLARE_WAITQUEUE(wait, current);
1251 struct async *as = NULL;
1252 struct usb_device *dev = ps->dev;
1253
1254 add_wait_queue(&ps->wait, &wait);
1255 for (;;) {
1256 __set_current_state(TASK_INTERRUPTIBLE);
1257 as = async_getcompleted(ps);
1258 if (as)
1259 break;
1260 if (signal_pending(current))
1261 break;
1262 usb_unlock_device(dev);
1263 schedule();
1264 usb_lock_device(dev);
1265 }
1266 remove_wait_queue(&ps->wait, &wait);
1267 set_current_state(TASK_RUNNING);
1268 return as;
1269 }
1270
1271 static int proc_reapurb(struct dev_state *ps, void __user *arg)
1272 {
1273 struct async *as = reap_as(ps);
1274 if (as)
1275 return processcompl(as, (void __user * __user *)arg);
1276 if (signal_pending(current))
1277 return -EINTR;
1278 return -EIO;
1279 }
1280
1281 static int proc_reapurbnonblock(struct dev_state *ps, void __user *arg)
1282 {
1283 struct async *as;
1284
1285 if (!(as = async_getcompleted(ps)))
1286 return -EAGAIN;
1287 return processcompl(as, (void __user * __user *)arg);
1288 }
1289
1290 #ifdef CONFIG_COMPAT
1291
1292 static int get_urb32(struct usbdevfs_urb *kurb,
1293 struct usbdevfs_urb32 __user *uurb)
1294 {
1295 __u32 uptr;
1296 if (get_user(kurb->type, &uurb->type) ||
1297 __get_user(kurb->endpoint, &uurb->endpoint) ||
1298 __get_user(kurb->status, &uurb->status) ||
1299 __get_user(kurb->flags, &uurb->flags) ||
1300 __get_user(kurb->buffer_length, &uurb->buffer_length) ||
1301 __get_user(kurb->actual_length, &uurb->actual_length) ||
1302 __get_user(kurb->start_frame, &uurb->start_frame) ||
1303 __get_user(kurb->number_of_packets, &uurb->number_of_packets) ||
1304 __get_user(kurb->error_count, &uurb->error_count) ||
1305 __get_user(kurb->signr, &uurb->signr))
1306 return -EFAULT;
1307
1308 if (__get_user(uptr, &uurb->buffer))
1309 return -EFAULT;
1310 kurb->buffer = compat_ptr(uptr);
1311 if (__get_user(uptr, &uurb->buffer))
1312 return -EFAULT;
1313 kurb->usercontext = compat_ptr(uptr);
1314
1315 return 0;
1316 }
1317
1318 static int proc_submiturb_compat(struct dev_state *ps, void __user *arg)
1319 {
1320 struct usbdevfs_urb uurb;
1321
1322 if (get_urb32(&uurb, (struct usbdevfs_urb32 __user *)arg))
1323 return -EFAULT;
1324
1325 return proc_do_submiturb(ps, &uurb,
1326 ((struct usbdevfs_urb32 __user *)arg)->iso_frame_desc,
1327 arg);
1328 }
1329
1330 static int processcompl_compat(struct async *as, void __user * __user *arg)
1331 {
1332 struct urb *urb = as->urb;
1333 struct usbdevfs_urb32 __user *userurb = as->userurb;
1334 void __user *addr = as->userurb;
1335 unsigned int i;
1336
1337 if (as->userbuffer)
1338 if (copy_to_user(as->userbuffer, urb->transfer_buffer,
1339 urb->transfer_buffer_length))
1340 return -EFAULT;
1341 if (put_user(as->status, &userurb->status))
1342 return -EFAULT;
1343 if (put_user(urb->actual_length, &userurb->actual_length))
1344 return -EFAULT;
1345 if (put_user(urb->error_count, &userurb->error_count))
1346 return -EFAULT;
1347
1348 if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
1349 for (i = 0; i < urb->number_of_packets; i++) {
1350 if (put_user(urb->iso_frame_desc[i].actual_length,
1351 &userurb->iso_frame_desc[i].actual_length))
1352 return -EFAULT;
1353 if (put_user(urb->iso_frame_desc[i].status,
1354 &userurb->iso_frame_desc[i].status))
1355 return -EFAULT;
1356 }
1357 }
1358
1359 free_async(as);
1360 if (put_user(ptr_to_compat(addr), (u32 __user *)arg))
1361 return -EFAULT;
1362 return 0;
1363 }
1364
1365 static int proc_reapurb_compat(struct dev_state *ps, void __user *arg)
1366 {
1367 struct async *as = reap_as(ps);
1368 if (as)
1369 return processcompl_compat(as, (void __user * __user *)arg);
1370 if (signal_pending(current))
1371 return -EINTR;
1372 return -EIO;
1373 }
1374
1375 static int proc_reapurbnonblock_compat(struct dev_state *ps, void __user *arg)
1376 {
1377 struct async *as;
1378
1379 if (!(as = async_getcompleted(ps)))
1380 return -EAGAIN;
1381 return processcompl_compat(as, (void __user * __user *)arg);
1382 }
1383
1384 #endif
1385
1386 static int proc_disconnectsignal(struct dev_state *ps, void __user *arg)
1387 {
1388 struct usbdevfs_disconnectsignal ds;
1389
1390 if (copy_from_user(&ds, arg, sizeof(ds)))
1391 return -EFAULT;
1392 if (ds.signr != 0 && (ds.signr < SIGRTMIN || ds.signr > SIGRTMAX))
1393 return -EINVAL;
1394 ps->discsignr = ds.signr;
1395 ps->disccontext = ds.context;
1396 return 0;
1397 }
1398
1399 static int proc_claiminterface(struct dev_state *ps, void __user *arg)
1400 {
1401 unsigned int ifnum;
1402
1403 if (get_user(ifnum, (unsigned int __user *)arg))
1404 return -EFAULT;
1405 return claimintf(ps, ifnum);
1406 }
1407
1408 static int proc_releaseinterface(struct dev_state *ps, void __user *arg)
1409 {
1410 unsigned int ifnum;
1411 int ret;
1412
1413 if (get_user(ifnum, (unsigned int __user *)arg))
1414 return -EFAULT;
1415 if ((ret = releaseintf(ps, ifnum)) < 0)
1416 return ret;
1417 destroy_async_on_interface (ps, ifnum);
1418 return 0;
1419 }
1420
1421 static int proc_ioctl(struct dev_state *ps, struct usbdevfs_ioctl *ctl)
1422 {
1423 int size;
1424 void *buf = NULL;
1425 int retval = 0;
1426 struct usb_interface *intf = NULL;
1427 struct usb_driver *driver = NULL;
1428
1429 /* alloc buffer */
1430 if ((size = _IOC_SIZE(ctl->ioctl_code)) > 0) {
1431 if ((buf = kmalloc(size, GFP_KERNEL)) == NULL)
1432 return -ENOMEM;
1433 if ((_IOC_DIR(ctl->ioctl_code) & _IOC_WRITE)) {
1434 if (copy_from_user(buf, ctl->data, size)) {
1435 kfree(buf);
1436 return -EFAULT;
1437 }
1438 } else {
1439 memset(buf, 0, size);
1440 }
1441 }
1442
1443 if (!connected(ps)) {
1444 kfree(buf);
1445 return -ENODEV;
1446 }
1447
1448 if (ps->dev->state != USB_STATE_CONFIGURED)
1449 retval = -EHOSTUNREACH;
1450 else if (!(intf = usb_ifnum_to_if(ps->dev, ctl->ifno)))
1451 retval = -EINVAL;
1452 else switch (ctl->ioctl_code) {
1453
1454 /* disconnect kernel driver from interface */
1455 case USBDEVFS_DISCONNECT:
1456 if (intf->dev.driver) {
1457 driver = to_usb_driver(intf->dev.driver);
1458 dev_dbg(&intf->dev, "disconnect by usbfs\n");
1459 usb_driver_release_interface(driver, intf);
1460 } else
1461 retval = -ENODATA;
1462 break;
1463
1464 /* let kernel drivers try to (re)bind to the interface */
1465 case USBDEVFS_CONNECT:
1466 if (!intf->dev.driver)
1467 retval = device_attach(&intf->dev);
1468 else
1469 retval = -EBUSY;
1470 break;
1471
1472 /* talk directly to the interface's driver */
1473 default:
1474 if (intf->dev.driver)
1475 driver = to_usb_driver(intf->dev.driver);
1476 if (driver == NULL || driver->ioctl == NULL) {
1477 retval = -ENOTTY;
1478 } else {
1479 retval = driver->ioctl(intf, ctl->ioctl_code, buf);
1480 if (retval == -ENOIOCTLCMD)
1481 retval = -ENOTTY;
1482 }
1483 }
1484
1485 /* cleanup and return */
1486 if (retval >= 0
1487 && (_IOC_DIR(ctl->ioctl_code) & _IOC_READ) != 0
1488 && size > 0
1489 && copy_to_user(ctl->data, buf, size) != 0)
1490 retval = -EFAULT;
1491
1492 kfree(buf);
1493 return retval;
1494 }
1495
1496 static int proc_ioctl_default(struct dev_state *ps, void __user *arg)
1497 {
1498 struct usbdevfs_ioctl ctrl;
1499
1500 if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
1501 return -EFAULT;
1502 return proc_ioctl(ps, &ctrl);
1503 }
1504
1505 #ifdef CONFIG_COMPAT
1506 static int proc_ioctl_compat(struct dev_state *ps, compat_uptr_t arg)
1507 {
1508 struct usbdevfs_ioctl32 __user *uioc;
1509 struct usbdevfs_ioctl ctrl;
1510 u32 udata;
1511
1512 uioc = compat_ptr((long)arg);
1513 if (get_user(ctrl.ifno, &uioc->ifno) ||
1514 get_user(ctrl.ioctl_code, &uioc->ioctl_code) ||
1515 __get_user(udata, &uioc->data))
1516 return -EFAULT;
1517 ctrl.data = compat_ptr(udata);
1518
1519 return proc_ioctl(ps, &ctrl);
1520 }
1521 #endif
1522
1523 /*
1524 * NOTE: All requests here that have interface numbers as parameters
1525 * are assuming that somehow the configuration has been prevented from
1526 * changing. But there's no mechanism to ensure that...
1527 */
1528 static int usbdev_ioctl(struct inode *inode, struct file *file,
1529 unsigned int cmd, unsigned long arg)
1530 {
1531 struct dev_state *ps = file->private_data;
1532 struct usb_device *dev = ps->dev;
1533 void __user *p = (void __user *)arg;
1534 int ret = -ENOTTY;
1535
1536 if (!(file->f_mode & FMODE_WRITE))
1537 return -EPERM;
1538 usb_lock_device(dev);
1539 if (!connected(ps)) {
1540 usb_unlock_device(dev);
1541 return -ENODEV;
1542 }
1543
1544 switch (cmd) {
1545 case USBDEVFS_CONTROL:
1546 snoop(&dev->dev, "%s: CONTROL\n", __func__);
1547 ret = proc_control(ps, p);
1548 if (ret >= 0)
1549 inode->i_mtime = CURRENT_TIME;
1550 break;
1551
1552 case USBDEVFS_BULK:
1553 snoop(&dev->dev, "%s: BULK\n", __func__);
1554 ret = proc_bulk(ps, p);
1555 if (ret >= 0)
1556 inode->i_mtime = CURRENT_TIME;
1557 break;
1558
1559 case USBDEVFS_RESETEP:
1560 snoop(&dev->dev, "%s: RESETEP\n", __func__);
1561 ret = proc_resetep(ps, p);
1562 if (ret >= 0)
1563 inode->i_mtime = CURRENT_TIME;
1564 break;
1565
1566 case USBDEVFS_RESET:
1567 snoop(&dev->dev, "%s: RESET\n", __func__);
1568 ret = proc_resetdevice(ps);
1569 break;
1570
1571 case USBDEVFS_CLEAR_HALT:
1572 snoop(&dev->dev, "%s: CLEAR_HALT\n", __func__);
1573 ret = proc_clearhalt(ps, p);
1574 if (ret >= 0)
1575 inode->i_mtime = CURRENT_TIME;
1576 break;
1577
1578 case USBDEVFS_GETDRIVER:
1579 snoop(&dev->dev, "%s: GETDRIVER\n", __func__);
1580 ret = proc_getdriver(ps, p);
1581 break;
1582
1583 case USBDEVFS_CONNECTINFO:
1584 snoop(&dev->dev, "%s: CONNECTINFO\n", __func__);
1585 ret = proc_connectinfo(ps, p);
1586 break;
1587
1588 case USBDEVFS_SETINTERFACE:
1589 snoop(&dev->dev, "%s: SETINTERFACE\n", __func__);
1590 ret = proc_setintf(ps, p);
1591 break;
1592
1593 case USBDEVFS_SETCONFIGURATION:
1594 snoop(&dev->dev, "%s: SETCONFIGURATION\n", __func__);
1595 ret = proc_setconfig(ps, p);
1596 break;
1597
1598 case USBDEVFS_SUBMITURB:
1599 snoop(&dev->dev, "%s: SUBMITURB\n", __func__);
1600 ret = proc_submiturb(ps, p);
1601 if (ret >= 0)
1602 inode->i_mtime = CURRENT_TIME;
1603 break;
1604
1605 #ifdef CONFIG_COMPAT
1606
1607 case USBDEVFS_SUBMITURB32:
1608 snoop(&dev->dev, "%s: SUBMITURB32\n", __func__);
1609 ret = proc_submiturb_compat(ps, p);
1610 if (ret >= 0)
1611 inode->i_mtime = CURRENT_TIME;
1612 break;
1613
1614 case USBDEVFS_REAPURB32:
1615 snoop(&dev->dev, "%s: REAPURB32\n", __func__);
1616 ret = proc_reapurb_compat(ps, p);
1617 break;
1618
1619 case USBDEVFS_REAPURBNDELAY32:
1620 snoop(&dev->dev, "%s: REAPURBDELAY32\n", __func__);
1621 ret = proc_reapurbnonblock_compat(ps, p);
1622 break;
1623
1624 case USBDEVFS_IOCTL32:
1625 snoop(&dev->dev, "%s: IOCTL\n", __func__);
1626 ret = proc_ioctl_compat(ps, ptr_to_compat(p));
1627 break;
1628 #endif
1629
1630 case USBDEVFS_DISCARDURB:
1631 snoop(&dev->dev, "%s: DISCARDURB\n", __func__);
1632 ret = proc_unlinkurb(ps, p);
1633 break;
1634
1635 case USBDEVFS_REAPURB:
1636 snoop(&dev->dev, "%s: REAPURB\n", __func__);
1637 ret = proc_reapurb(ps, p);
1638 break;
1639
1640 case USBDEVFS_REAPURBNDELAY:
1641 snoop(&dev->dev, "%s: REAPURBDELAY\n", __func__);
1642 ret = proc_reapurbnonblock(ps, p);
1643 break;
1644
1645 case USBDEVFS_DISCSIGNAL:
1646 snoop(&dev->dev, "%s: DISCSIGNAL\n", __func__);
1647 ret = proc_disconnectsignal(ps, p);
1648 break;
1649
1650 case USBDEVFS_CLAIMINTERFACE:
1651 snoop(&dev->dev, "%s: CLAIMINTERFACE\n", __func__);
1652 ret = proc_claiminterface(ps, p);
1653 break;
1654
1655 case USBDEVFS_RELEASEINTERFACE:
1656 snoop(&dev->dev, "%s: RELEASEINTERFACE\n", __func__);
1657 ret = proc_releaseinterface(ps, p);
1658 break;
1659
1660 case USBDEVFS_IOCTL:
1661 snoop(&dev->dev, "%s: IOCTL\n", __func__);
1662 ret = proc_ioctl_default(ps, p);
1663 break;
1664 }
1665 usb_unlock_device(dev);
1666 if (ret >= 0)
1667 inode->i_atime = CURRENT_TIME;
1668 return ret;
1669 }
1670
1671 /* No kernel lock - fine */
1672 static unsigned int usbdev_poll(struct file *file,
1673 struct poll_table_struct *wait)
1674 {
1675 struct dev_state *ps = file->private_data;
1676 unsigned int mask = 0;
1677
1678 poll_wait(file, &ps->wait, wait);
1679 if (file->f_mode & FMODE_WRITE && !list_empty(&ps->async_completed))
1680 mask |= POLLOUT | POLLWRNORM;
1681 if (!connected(ps))
1682 mask |= POLLERR | POLLHUP;
1683 return mask;
1684 }
1685
1686 const struct file_operations usbdev_file_operations = {
1687 .owner = THIS_MODULE,
1688 .llseek = usbdev_lseek,
1689 .read = usbdev_read,
1690 .poll = usbdev_poll,
1691 .ioctl = usbdev_ioctl,
1692 .open = usbdev_open,
1693 .release = usbdev_release,
1694 };
1695
1696 void usb_fs_classdev_common_remove(struct usb_device *udev)
1697 {
1698 struct dev_state *ps;
1699 struct siginfo sinfo;
1700
1701 while (!list_empty(&udev->filelist)) {
1702 ps = list_entry(udev->filelist.next, struct dev_state, list);
1703 destroy_all_async(ps);
1704 wake_up_all(&ps->wait);
1705 list_del_init(&ps->list);
1706 if (ps->discsignr) {
1707 sinfo.si_signo = ps->discsignr;
1708 sinfo.si_errno = EPIPE;
1709 sinfo.si_code = SI_ASYNCIO;
1710 sinfo.si_addr = ps->disccontext;
1711 kill_pid_info_as_uid(ps->discsignr, &sinfo,
1712 ps->disc_pid, ps->disc_uid,
1713 ps->disc_euid, ps->secid);
1714 }
1715 }
1716 }
1717
1718 #ifdef CONFIG_USB_DEVICE_CLASS
1719 static struct class *usb_classdev_class;
1720
1721 static int usb_classdev_add(struct usb_device *dev)
1722 {
1723 int minor = ((dev->bus->busnum-1) * 128) + (dev->devnum-1);
1724
1725 dev->usb_classdev = device_create(usb_classdev_class, &dev->dev,
1726 MKDEV(USB_DEVICE_MAJOR, minor),
1727 "usbdev%d.%d", dev->bus->busnum, dev->devnum);
1728 if (IS_ERR(dev->usb_classdev))
1729 return PTR_ERR(dev->usb_classdev);
1730
1731 return 0;
1732 }
1733
1734 static void usb_classdev_remove(struct usb_device *dev)
1735 {
1736 device_unregister(dev->usb_classdev);
1737 usb_fs_classdev_common_remove(dev);
1738 }
1739
1740 static int usb_classdev_notify(struct notifier_block *self,
1741 unsigned long action, void *dev)
1742 {
1743 switch (action) {
1744 case USB_DEVICE_ADD:
1745 if (usb_classdev_add(dev))
1746 return NOTIFY_BAD;
1747 break;
1748 case USB_DEVICE_REMOVE:
1749 usb_classdev_remove(dev);
1750 break;
1751 }
1752 return NOTIFY_OK;
1753 }
1754
1755 static struct notifier_block usbdev_nb = {
1756 .notifier_call = usb_classdev_notify,
1757 };
1758 #endif
1759
1760 static struct cdev usb_device_cdev;
1761
1762 int __init usb_devio_init(void)
1763 {
1764 int retval;
1765
1766 retval = register_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX,
1767 "usb_device");
1768 if (retval) {
1769 err("unable to register minors for usb_device");
1770 goto out;
1771 }
1772 cdev_init(&usb_device_cdev, &usbdev_file_operations);
1773 retval = cdev_add(&usb_device_cdev, USB_DEVICE_DEV, USB_DEVICE_MAX);
1774 if (retval) {
1775 err("unable to get usb_device major %d", USB_DEVICE_MAJOR);
1776 goto error_cdev;
1777 }
1778 #ifdef CONFIG_USB_DEVICE_CLASS
1779 usb_classdev_class = class_create(THIS_MODULE, "usb_device");
1780 if (IS_ERR(usb_classdev_class)) {
1781 err("unable to register usb_device class");
1782 retval = PTR_ERR(usb_classdev_class);
1783 cdev_del(&usb_device_cdev);
1784 usb_classdev_class = NULL;
1785 goto out;
1786 }
1787
1788 usb_register_notify(&usbdev_nb);
1789 #endif
1790 out:
1791 return retval;
1792
1793 error_cdev:
1794 unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
1795 goto out;
1796 }
1797
1798 void usb_devio_cleanup(void)
1799 {
1800 #ifdef CONFIG_USB_DEVICE_CLASS
1801 usb_unregister_notify(&usbdev_nb);
1802 class_destroy(usb_classdev_class);
1803 #endif
1804 cdev_del(&usb_device_cdev);
1805 unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
1806 }
Support for the Chinese Samsung S3C2440 based development boards