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USB: make usbdevices export their device nodes instead of using a separate class
[mirror_ubuntu-eoan-kernel.git] / drivers / usb / core / devio.c
1 /*****************************************************************************/
2
3 /*
4 * devio.c -- User space communication with USB devices.
5 *
6 * Copyright (C) 1999-2000 Thomas Sailer (sailer@ife.ee.ethz.ch)
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
21 *
22 * $Id: devio.c,v 1.7 2000/02/01 17:28:48 fliegl Exp $
23 *
24 * This file implements the usbfs/x/y files, where
25 * x is the bus number and y the device number.
26 *
27 * It allows user space programs/"drivers" to communicate directly
28 * with USB devices without intervening kernel driver.
29 *
30 * Revision history
31 * 22.12.1999 0.1 Initial release (split from proc_usb.c)
32 * 04.01.2000 0.2 Turned into its own filesystem
33 * 30.09.2005 0.3 Fix user-triggerable oops in async URB delivery
34 * (CAN-2005-3055)
35 */
36
37 /*****************************************************************************/
38
39 #include <linux/fs.h>
40 #include <linux/mm.h>
41 #include <linux/slab.h>
42 #include <linux/smp_lock.h>
43 #include <linux/signal.h>
44 #include <linux/poll.h>
45 #include <linux/module.h>
46 #include <linux/usb.h>
47 #include <linux/usbdevice_fs.h>
48 #include <linux/cdev.h>
49 #include <linux/notifier.h>
50 #include <linux/security.h>
51 #include <asm/uaccess.h>
52 #include <asm/byteorder.h>
53 #include <linux/moduleparam.h>
54
55 #include "hcd.h" /* for usbcore internals */
56 #include "usb.h"
57
58 #define USB_MAXBUS 64
59 #define USB_DEVICE_MAX USB_MAXBUS * 128
60
61 /* Mutual exclusion for removal, open, and release */
62 DEFINE_MUTEX(usbfs_mutex);
63
64 struct async {
65 struct list_head asynclist;
66 struct dev_state *ps;
67 struct pid *pid;
68 uid_t uid, euid;
69 unsigned int signr;
70 unsigned int ifnum;
71 void __user *userbuffer;
72 void __user *userurb;
73 struct urb *urb;
74 u32 secid;
75 };
76
77 static int usbfs_snoop = 0;
78 module_param (usbfs_snoop, bool, S_IRUGO | S_IWUSR);
79 MODULE_PARM_DESC (usbfs_snoop, "true to log all usbfs traffic");
80
81 #define snoop(dev, format, arg...) \
82 do { \
83 if (usbfs_snoop) \
84 dev_info( dev , format , ## arg); \
85 } while (0)
86
87 #define USB_DEVICE_DEV MKDEV(USB_DEVICE_MAJOR, 0)
88
89
90 #define MAX_USBFS_BUFFER_SIZE 16384
91
92 static inline int connected (struct dev_state *ps)
93 {
94 return (!list_empty(&ps->list) &&
95 ps->dev->state != USB_STATE_NOTATTACHED);
96 }
97
98 static loff_t usbdev_lseek(struct file *file, loff_t offset, int orig)
99 {
100 loff_t ret;
101
102 lock_kernel();
103
104 switch (orig) {
105 case 0:
106 file->f_pos = offset;
107 ret = file->f_pos;
108 break;
109 case 1:
110 file->f_pos += offset;
111 ret = file->f_pos;
112 break;
113 case 2:
114 default:
115 ret = -EINVAL;
116 }
117
118 unlock_kernel();
119 return ret;
120 }
121
122 static ssize_t usbdev_read(struct file *file, char __user *buf, size_t nbytes, loff_t *ppos)
123 {
124 struct dev_state *ps = file->private_data;
125 struct usb_device *dev = ps->dev;
126 ssize_t ret = 0;
127 unsigned len;
128 loff_t pos;
129 int i;
130
131 pos = *ppos;
132 usb_lock_device(dev);
133 if (!connected(ps)) {
134 ret = -ENODEV;
135 goto err;
136 } else if (pos < 0) {
137 ret = -EINVAL;
138 goto err;
139 }
140
141 if (pos < sizeof(struct usb_device_descriptor)) {
142 struct usb_device_descriptor temp_desc ; /* 18 bytes - fits on the stack */
143
144 memcpy(&temp_desc, &dev->descriptor, sizeof(dev->descriptor));
145 le16_to_cpus(&temp_desc.bcdUSB);
146 le16_to_cpus(&temp_desc.idVendor);
147 le16_to_cpus(&temp_desc.idProduct);
148 le16_to_cpus(&temp_desc.bcdDevice);
149
150 len = sizeof(struct usb_device_descriptor) - pos;
151 if (len > nbytes)
152 len = nbytes;
153 if (copy_to_user(buf, ((char *)&temp_desc) + pos, len)) {
154 ret = -EFAULT;
155 goto err;
156 }
157
158 *ppos += len;
159 buf += len;
160 nbytes -= len;
161 ret += len;
162 }
163
164 pos = sizeof(struct usb_device_descriptor);
165 for (i = 0; nbytes && i < dev->descriptor.bNumConfigurations; i++) {
166 struct usb_config_descriptor *config =
167 (struct usb_config_descriptor *)dev->rawdescriptors[i];
168 unsigned int length = le16_to_cpu(config->wTotalLength);
169
170 if (*ppos < pos + length) {
171
172 /* The descriptor may claim to be longer than it
173 * really is. Here is the actual allocated length. */
174 unsigned alloclen =
175 le16_to_cpu(dev->config[i].desc.wTotalLength);
176
177 len = length - (*ppos - pos);
178 if (len > nbytes)
179 len = nbytes;
180
181 /* Simply don't write (skip over) unallocated parts */
182 if (alloclen > (*ppos - pos)) {
183 alloclen -= (*ppos - pos);
184 if (copy_to_user(buf,
185 dev->rawdescriptors[i] + (*ppos - pos),
186 min(len, alloclen))) {
187 ret = -EFAULT;
188 goto err;
189 }
190 }
191
192 *ppos += len;
193 buf += len;
194 nbytes -= len;
195 ret += len;
196 }
197
198 pos += length;
199 }
200
201 err:
202 usb_unlock_device(dev);
203 return ret;
204 }
205
206 /*
207 * async list handling
208 */
209
210 static struct async *alloc_async(unsigned int numisoframes)
211 {
212 unsigned int assize = sizeof(struct async) + numisoframes * sizeof(struct usb_iso_packet_descriptor);
213 struct async *as = kzalloc(assize, GFP_KERNEL);
214
215 if (!as)
216 return NULL;
217 as->urb = usb_alloc_urb(numisoframes, GFP_KERNEL);
218 if (!as->urb) {
219 kfree(as);
220 return NULL;
221 }
222 return as;
223 }
224
225 static void free_async(struct async *as)
226 {
227 put_pid(as->pid);
228 kfree(as->urb->transfer_buffer);
229 kfree(as->urb->setup_packet);
230 usb_free_urb(as->urb);
231 kfree(as);
232 }
233
234 static inline void async_newpending(struct async *as)
235 {
236 struct dev_state *ps = as->ps;
237 unsigned long flags;
238
239 spin_lock_irqsave(&ps->lock, flags);
240 list_add_tail(&as->asynclist, &ps->async_pending);
241 spin_unlock_irqrestore(&ps->lock, flags);
242 }
243
244 static inline void async_removepending(struct async *as)
245 {
246 struct dev_state *ps = as->ps;
247 unsigned long flags;
248
249 spin_lock_irqsave(&ps->lock, flags);
250 list_del_init(&as->asynclist);
251 spin_unlock_irqrestore(&ps->lock, flags);
252 }
253
254 static inline struct async *async_getcompleted(struct dev_state *ps)
255 {
256 unsigned long flags;
257 struct async *as = NULL;
258
259 spin_lock_irqsave(&ps->lock, flags);
260 if (!list_empty(&ps->async_completed)) {
261 as = list_entry(ps->async_completed.next, struct async, asynclist);
262 list_del_init(&as->asynclist);
263 }
264 spin_unlock_irqrestore(&ps->lock, flags);
265 return as;
266 }
267
268 static inline struct async *async_getpending(struct dev_state *ps, void __user *userurb)
269 {
270 unsigned long flags;
271 struct async *as;
272
273 spin_lock_irqsave(&ps->lock, flags);
274 list_for_each_entry(as, &ps->async_pending, asynclist)
275 if (as->userurb == userurb) {
276 list_del_init(&as->asynclist);
277 spin_unlock_irqrestore(&ps->lock, flags);
278 return as;
279 }
280 spin_unlock_irqrestore(&ps->lock, flags);
281 return NULL;
282 }
283
284 static void snoop_urb(struct urb *urb, void __user *userurb)
285 {
286 int j;
287 unsigned char *data = urb->transfer_buffer;
288
289 if (!usbfs_snoop)
290 return;
291
292 if (urb->pipe & USB_DIR_IN)
293 dev_info(&urb->dev->dev, "direction=IN\n");
294 else
295 dev_info(&urb->dev->dev, "direction=OUT\n");
296 dev_info(&urb->dev->dev, "userurb=%p\n", userurb);
297 dev_info(&urb->dev->dev, "transfer_buffer_length=%d\n",
298 urb->transfer_buffer_length);
299 dev_info(&urb->dev->dev, "actual_length=%d\n", urb->actual_length);
300 dev_info(&urb->dev->dev, "data: ");
301 for (j = 0; j < urb->transfer_buffer_length; ++j)
302 printk ("%02x ", data[j]);
303 printk("\n");
304 }
305
306 static void async_completed(struct urb *urb)
307 {
308 struct async *as = urb->context;
309 struct dev_state *ps = as->ps;
310 struct siginfo sinfo;
311
312 spin_lock(&ps->lock);
313 list_move_tail(&as->asynclist, &ps->async_completed);
314 spin_unlock(&ps->lock);
315 if (as->signr) {
316 sinfo.si_signo = as->signr;
317 sinfo.si_errno = as->urb->status;
318 sinfo.si_code = SI_ASYNCIO;
319 sinfo.si_addr = as->userurb;
320 kill_pid_info_as_uid(as->signr, &sinfo, as->pid, as->uid,
321 as->euid, as->secid);
322 }
323 snoop(&urb->dev->dev, "urb complete\n");
324 snoop_urb(urb, as->userurb);
325 wake_up(&ps->wait);
326 }
327
328 static void destroy_async (struct dev_state *ps, struct list_head *list)
329 {
330 struct async *as;
331 unsigned long flags;
332
333 spin_lock_irqsave(&ps->lock, flags);
334 while (!list_empty(list)) {
335 as = list_entry(list->next, struct async, asynclist);
336 list_del_init(&as->asynclist);
337
338 /* drop the spinlock so the completion handler can run */
339 spin_unlock_irqrestore(&ps->lock, flags);
340 usb_kill_urb(as->urb);
341 spin_lock_irqsave(&ps->lock, flags);
342 }
343 spin_unlock_irqrestore(&ps->lock, flags);
344 as = async_getcompleted(ps);
345 while (as) {
346 free_async(as);
347 as = async_getcompleted(ps);
348 }
349 }
350
351 static void destroy_async_on_interface (struct dev_state *ps, unsigned int ifnum)
352 {
353 struct list_head *p, *q, hitlist;
354 unsigned long flags;
355
356 INIT_LIST_HEAD(&hitlist);
357 spin_lock_irqsave(&ps->lock, flags);
358 list_for_each_safe(p, q, &ps->async_pending)
359 if (ifnum == list_entry(p, struct async, asynclist)->ifnum)
360 list_move_tail(p, &hitlist);
361 spin_unlock_irqrestore(&ps->lock, flags);
362 destroy_async(ps, &hitlist);
363 }
364
365 static inline void destroy_all_async(struct dev_state *ps)
366 {
367 destroy_async(ps, &ps->async_pending);
368 }
369
370 /*
371 * interface claims are made only at the request of user level code,
372 * which can also release them (explicitly or by closing files).
373 * they're also undone when devices disconnect.
374 */
375
376 static int driver_probe (struct usb_interface *intf,
377 const struct usb_device_id *id)
378 {
379 return -ENODEV;
380 }
381
382 static void driver_disconnect(struct usb_interface *intf)
383 {
384 struct dev_state *ps = usb_get_intfdata (intf);
385 unsigned int ifnum = intf->altsetting->desc.bInterfaceNumber;
386
387 if (!ps)
388 return;
389
390 /* NOTE: this relies on usbcore having canceled and completed
391 * all pending I/O requests; 2.6 does that.
392 */
393
394 if (likely(ifnum < 8*sizeof(ps->ifclaimed)))
395 clear_bit(ifnum, &ps->ifclaimed);
396 else
397 warn("interface number %u out of range", ifnum);
398
399 usb_set_intfdata (intf, NULL);
400
401 /* force async requests to complete */
402 destroy_async_on_interface(ps, ifnum);
403 }
404
405 struct usb_driver usbfs_driver = {
406 .name = "usbfs",
407 .probe = driver_probe,
408 .disconnect = driver_disconnect,
409 };
410
411 static int claimintf(struct dev_state *ps, unsigned int ifnum)
412 {
413 struct usb_device *dev = ps->dev;
414 struct usb_interface *intf;
415 int err;
416
417 if (ifnum >= 8*sizeof(ps->ifclaimed))
418 return -EINVAL;
419 /* already claimed */
420 if (test_bit(ifnum, &ps->ifclaimed))
421 return 0;
422
423 intf = usb_ifnum_to_if(dev, ifnum);
424 if (!intf)
425 err = -ENOENT;
426 else
427 err = usb_driver_claim_interface(&usbfs_driver, intf, ps);
428 if (err == 0)
429 set_bit(ifnum, &ps->ifclaimed);
430 return err;
431 }
432
433 static int releaseintf(struct dev_state *ps, unsigned int ifnum)
434 {
435 struct usb_device *dev;
436 struct usb_interface *intf;
437 int err;
438
439 err = -EINVAL;
440 if (ifnum >= 8*sizeof(ps->ifclaimed))
441 return err;
442 dev = ps->dev;
443 intf = usb_ifnum_to_if(dev, ifnum);
444 if (!intf)
445 err = -ENOENT;
446 else if (test_and_clear_bit(ifnum, &ps->ifclaimed)) {
447 usb_driver_release_interface(&usbfs_driver, intf);
448 err = 0;
449 }
450 return err;
451 }
452
453 static int checkintf(struct dev_state *ps, unsigned int ifnum)
454 {
455 if (ps->dev->state != USB_STATE_CONFIGURED)
456 return -EHOSTUNREACH;
457 if (ifnum >= 8*sizeof(ps->ifclaimed))
458 return -EINVAL;
459 if (test_bit(ifnum, &ps->ifclaimed))
460 return 0;
461 /* if not yet claimed, claim it for the driver */
462 dev_warn(&ps->dev->dev, "usbfs: process %d (%s) did not claim interface %u before use\n",
463 current->pid, current->comm, ifnum);
464 return claimintf(ps, ifnum);
465 }
466
467 static int findintfep(struct usb_device *dev, unsigned int ep)
468 {
469 unsigned int i, j, e;
470 struct usb_interface *intf;
471 struct usb_host_interface *alts;
472 struct usb_endpoint_descriptor *endpt;
473
474 if (ep & ~(USB_DIR_IN|0xf))
475 return -EINVAL;
476 if (!dev->actconfig)
477 return -ESRCH;
478 for (i = 0; i < dev->actconfig->desc.bNumInterfaces; i++) {
479 intf = dev->actconfig->interface[i];
480 for (j = 0; j < intf->num_altsetting; j++) {
481 alts = &intf->altsetting[j];
482 for (e = 0; e < alts->desc.bNumEndpoints; e++) {
483 endpt = &alts->endpoint[e].desc;
484 if (endpt->bEndpointAddress == ep)
485 return alts->desc.bInterfaceNumber;
486 }
487 }
488 }
489 return -ENOENT;
490 }
491
492 static int check_ctrlrecip(struct dev_state *ps, unsigned int requesttype, unsigned int index)
493 {
494 int ret = 0;
495
496 if (ps->dev->state != USB_STATE_ADDRESS
497 && ps->dev->state != USB_STATE_CONFIGURED)
498 return -EHOSTUNREACH;
499 if (USB_TYPE_VENDOR == (USB_TYPE_MASK & requesttype))
500 return 0;
501
502 index &= 0xff;
503 switch (requesttype & USB_RECIP_MASK) {
504 case USB_RECIP_ENDPOINT:
505 if ((ret = findintfep(ps->dev, index)) >= 0)
506 ret = checkintf(ps, ret);
507 break;
508
509 case USB_RECIP_INTERFACE:
510 ret = checkintf(ps, index);
511 break;
512 }
513 return ret;
514 }
515
516 static int __match_minor(struct device *dev, void *data)
517 {
518 int minor = *((int *)data);
519
520 if (dev->devt == MKDEV(USB_DEVICE_MAJOR, minor))
521 return 1;
522 return 0;
523 }
524
525 static struct usb_device *usbdev_lookup_by_minor(int minor)
526 {
527 struct device *dev;
528
529 dev = bus_find_device(&usb_bus_type, NULL, &minor, __match_minor);
530 if (!dev)
531 return NULL;
532 put_device(dev);
533 return container_of(dev, struct usb_device, dev);
534 }
535
536 /*
537 * file operations
538 */
539 static int usbdev_open(struct inode *inode, struct file *file)
540 {
541 struct usb_device *dev = NULL;
542 struct dev_state *ps;
543 int ret;
544
545 /* Protect against simultaneous removal or release */
546 mutex_lock(&usbfs_mutex);
547
548 ret = -ENOMEM;
549 if (!(ps = kmalloc(sizeof(struct dev_state), GFP_KERNEL)))
550 goto out;
551
552 ret = -ENOENT;
553 /* usbdev device-node */
554 if (imajor(inode) == USB_DEVICE_MAJOR)
555 dev = usbdev_lookup_by_minor(iminor(inode));
556 #ifdef CONFIG_USB_DEVICEFS
557 /* procfs file */
558 if (!dev)
559 dev = inode->i_private;
560 #endif
561 if (!dev)
562 goto out;
563 ret = usb_autoresume_device(dev);
564 if (ret)
565 goto out;
566
567 usb_get_dev(dev);
568 ret = 0;
569 ps->dev = dev;
570 ps->file = file;
571 spin_lock_init(&ps->lock);
572 INIT_LIST_HEAD(&ps->list);
573 INIT_LIST_HEAD(&ps->async_pending);
574 INIT_LIST_HEAD(&ps->async_completed);
575 init_waitqueue_head(&ps->wait);
576 ps->discsignr = 0;
577 ps->disc_pid = get_pid(task_pid(current));
578 ps->disc_uid = current->uid;
579 ps->disc_euid = current->euid;
580 ps->disccontext = NULL;
581 ps->ifclaimed = 0;
582 security_task_getsecid(current, &ps->secid);
583 wmb();
584 list_add_tail(&ps->list, &dev->filelist);
585 file->private_data = ps;
586 out:
587 if (ret)
588 kfree(ps);
589 mutex_unlock(&usbfs_mutex);
590 return ret;
591 }
592
593 static int usbdev_release(struct inode *inode, struct file *file)
594 {
595 struct dev_state *ps = file->private_data;
596 struct usb_device *dev = ps->dev;
597 unsigned int ifnum;
598
599 usb_lock_device(dev);
600
601 /* Protect against simultaneous open */
602 mutex_lock(&usbfs_mutex);
603 list_del_init(&ps->list);
604 mutex_unlock(&usbfs_mutex);
605
606 for (ifnum = 0; ps->ifclaimed && ifnum < 8*sizeof(ps->ifclaimed);
607 ifnum++) {
608 if (test_bit(ifnum, &ps->ifclaimed))
609 releaseintf(ps, ifnum);
610 }
611 destroy_all_async(ps);
612 usb_autosuspend_device(dev);
613 usb_unlock_device(dev);
614 usb_put_dev(dev);
615 put_pid(ps->disc_pid);
616 kfree(ps);
617 return 0;
618 }
619
620 static int proc_control(struct dev_state *ps, void __user *arg)
621 {
622 struct usb_device *dev = ps->dev;
623 struct usbdevfs_ctrltransfer ctrl;
624 unsigned int tmo;
625 unsigned char *tbuf;
626 int i, j, ret;
627
628 if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
629 return -EFAULT;
630 if ((ret = check_ctrlrecip(ps, ctrl.bRequestType, ctrl.wIndex)))
631 return ret;
632 if (ctrl.wLength > PAGE_SIZE)
633 return -EINVAL;
634 if (!(tbuf = (unsigned char *)__get_free_page(GFP_KERNEL)))
635 return -ENOMEM;
636 tmo = ctrl.timeout;
637 if (ctrl.bRequestType & 0x80) {
638 if (ctrl.wLength && !access_ok(VERIFY_WRITE, ctrl.data, ctrl.wLength)) {
639 free_page((unsigned long)tbuf);
640 return -EINVAL;
641 }
642 snoop(&dev->dev, "control read: bRequest=%02x "
643 "bRrequestType=%02x wValue=%04x "
644 "wIndex=%04x wLength=%04x\n",
645 ctrl.bRequest, ctrl.bRequestType, ctrl.wValue,
646 ctrl.wIndex, ctrl.wLength);
647
648 usb_unlock_device(dev);
649 i = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), ctrl.bRequest, ctrl.bRequestType,
650 ctrl.wValue, ctrl.wIndex, tbuf, ctrl.wLength, tmo);
651 usb_lock_device(dev);
652 if ((i > 0) && ctrl.wLength) {
653 if (usbfs_snoop) {
654 dev_info(&dev->dev, "control read: data ");
655 for (j = 0; j < i; ++j)
656 printk("%02x ", (unsigned char)(tbuf)[j]);
657 printk("\n");
658 }
659 if (copy_to_user(ctrl.data, tbuf, i)) {
660 free_page((unsigned long)tbuf);
661 return -EFAULT;
662 }
663 }
664 } else {
665 if (ctrl.wLength) {
666 if (copy_from_user(tbuf, ctrl.data, ctrl.wLength)) {
667 free_page((unsigned long)tbuf);
668 return -EFAULT;
669 }
670 }
671 snoop(&dev->dev, "control write: bRequest=%02x "
672 "bRrequestType=%02x wValue=%04x "
673 "wIndex=%04x wLength=%04x\n",
674 ctrl.bRequest, ctrl.bRequestType, ctrl.wValue,
675 ctrl.wIndex, ctrl.wLength);
676 if (usbfs_snoop) {
677 dev_info(&dev->dev, "control write: data: ");
678 for (j = 0; j < ctrl.wLength; ++j)
679 printk("%02x ", (unsigned char)(tbuf)[j]);
680 printk("\n");
681 }
682 usb_unlock_device(dev);
683 i = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), ctrl.bRequest, ctrl.bRequestType,
684 ctrl.wValue, ctrl.wIndex, tbuf, ctrl.wLength, tmo);
685 usb_lock_device(dev);
686 }
687 free_page((unsigned long)tbuf);
688 if (i<0 && i != -EPIPE) {
689 dev_printk(KERN_DEBUG, &dev->dev, "usbfs: USBDEVFS_CONTROL "
690 "failed cmd %s rqt %u rq %u len %u ret %d\n",
691 current->comm, ctrl.bRequestType, ctrl.bRequest,
692 ctrl.wLength, i);
693 }
694 return i;
695 }
696
697 static int proc_bulk(struct dev_state *ps, void __user *arg)
698 {
699 struct usb_device *dev = ps->dev;
700 struct usbdevfs_bulktransfer bulk;
701 unsigned int tmo, len1, pipe;
702 int len2;
703 unsigned char *tbuf;
704 int i, j, ret;
705
706 if (copy_from_user(&bulk, arg, sizeof(bulk)))
707 return -EFAULT;
708 if ((ret = findintfep(ps->dev, bulk.ep)) < 0)
709 return ret;
710 if ((ret = checkintf(ps, ret)))
711 return ret;
712 if (bulk.ep & USB_DIR_IN)
713 pipe = usb_rcvbulkpipe(dev, bulk.ep & 0x7f);
714 else
715 pipe = usb_sndbulkpipe(dev, bulk.ep & 0x7f);
716 if (!usb_maxpacket(dev, pipe, !(bulk.ep & USB_DIR_IN)))
717 return -EINVAL;
718 len1 = bulk.len;
719 if (len1 > MAX_USBFS_BUFFER_SIZE)
720 return -EINVAL;
721 if (!(tbuf = kmalloc(len1, GFP_KERNEL)))
722 return -ENOMEM;
723 tmo = bulk.timeout;
724 if (bulk.ep & 0x80) {
725 if (len1 && !access_ok(VERIFY_WRITE, bulk.data, len1)) {
726 kfree(tbuf);
727 return -EINVAL;
728 }
729 snoop(&dev->dev, "bulk read: len=0x%02x timeout=%04d\n",
730 bulk.len, bulk.timeout);
731 usb_unlock_device(dev);
732 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
733 usb_lock_device(dev);
734 if (!i && len2) {
735 if (usbfs_snoop) {
736 dev_info(&dev->dev, "bulk read: data ");
737 for (j = 0; j < len2; ++j)
738 printk("%02x ", (unsigned char)(tbuf)[j]);
739 printk("\n");
740 }
741 if (copy_to_user(bulk.data, tbuf, len2)) {
742 kfree(tbuf);
743 return -EFAULT;
744 }
745 }
746 } else {
747 if (len1) {
748 if (copy_from_user(tbuf, bulk.data, len1)) {
749 kfree(tbuf);
750 return -EFAULT;
751 }
752 }
753 snoop(&dev->dev, "bulk write: len=0x%02x timeout=%04d\n",
754 bulk.len, bulk.timeout);
755 if (usbfs_snoop) {
756 dev_info(&dev->dev, "bulk write: data: ");
757 for (j = 0; j < len1; ++j)
758 printk("%02x ", (unsigned char)(tbuf)[j]);
759 printk("\n");
760 }
761 usb_unlock_device(dev);
762 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
763 usb_lock_device(dev);
764 }
765 kfree(tbuf);
766 if (i < 0)
767 return i;
768 return len2;
769 }
770
771 static int proc_resetep(struct dev_state *ps, void __user *arg)
772 {
773 unsigned int ep;
774 int ret;
775
776 if (get_user(ep, (unsigned int __user *)arg))
777 return -EFAULT;
778 if ((ret = findintfep(ps->dev, ep)) < 0)
779 return ret;
780 if ((ret = checkintf(ps, ret)))
781 return ret;
782 usb_settoggle(ps->dev, ep & 0xf, !(ep & USB_DIR_IN), 0);
783 return 0;
784 }
785
786 static int proc_clearhalt(struct dev_state *ps, void __user *arg)
787 {
788 unsigned int ep;
789 int pipe;
790 int ret;
791
792 if (get_user(ep, (unsigned int __user *)arg))
793 return -EFAULT;
794 if ((ret = findintfep(ps->dev, ep)) < 0)
795 return ret;
796 if ((ret = checkintf(ps, ret)))
797 return ret;
798 if (ep & USB_DIR_IN)
799 pipe = usb_rcvbulkpipe(ps->dev, ep & 0x7f);
800 else
801 pipe = usb_sndbulkpipe(ps->dev, ep & 0x7f);
802
803 return usb_clear_halt(ps->dev, pipe);
804 }
805
806
807 static int proc_getdriver(struct dev_state *ps, void __user *arg)
808 {
809 struct usbdevfs_getdriver gd;
810 struct usb_interface *intf;
811 int ret;
812
813 if (copy_from_user(&gd, arg, sizeof(gd)))
814 return -EFAULT;
815 intf = usb_ifnum_to_if(ps->dev, gd.interface);
816 if (!intf || !intf->dev.driver)
817 ret = -ENODATA;
818 else {
819 strncpy(gd.driver, intf->dev.driver->name,
820 sizeof(gd.driver));
821 ret = (copy_to_user(arg, &gd, sizeof(gd)) ? -EFAULT : 0);
822 }
823 return ret;
824 }
825
826 static int proc_connectinfo(struct dev_state *ps, void __user *arg)
827 {
828 struct usbdevfs_connectinfo ci;
829
830 ci.devnum = ps->dev->devnum;
831 ci.slow = ps->dev->speed == USB_SPEED_LOW;
832 if (copy_to_user(arg, &ci, sizeof(ci)))
833 return -EFAULT;
834 return 0;
835 }
836
837 static int proc_resetdevice(struct dev_state *ps)
838 {
839 return usb_reset_composite_device(ps->dev, NULL);
840 }
841
842 static int proc_setintf(struct dev_state *ps, void __user *arg)
843 {
844 struct usbdevfs_setinterface setintf;
845 int ret;
846
847 if (copy_from_user(&setintf, arg, sizeof(setintf)))
848 return -EFAULT;
849 if ((ret = checkintf(ps, setintf.interface)))
850 return ret;
851 return usb_set_interface(ps->dev, setintf.interface,
852 setintf.altsetting);
853 }
854
855 static int proc_setconfig(struct dev_state *ps, void __user *arg)
856 {
857 int u;
858 int status = 0;
859 struct usb_host_config *actconfig;
860
861 if (get_user(u, (int __user *)arg))
862 return -EFAULT;
863
864 actconfig = ps->dev->actconfig;
865
866 /* Don't touch the device if any interfaces are claimed.
867 * It could interfere with other drivers' operations, and if
868 * an interface is claimed by usbfs it could easily deadlock.
869 */
870 if (actconfig) {
871 int i;
872
873 for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) {
874 if (usb_interface_claimed(actconfig->interface[i])) {
875 dev_warn (&ps->dev->dev,
876 "usbfs: interface %d claimed by %s "
877 "while '%s' sets config #%d\n",
878 actconfig->interface[i]
879 ->cur_altsetting
880 ->desc.bInterfaceNumber,
881 actconfig->interface[i]
882 ->dev.driver->name,
883 current->comm, u);
884 status = -EBUSY;
885 break;
886 }
887 }
888 }
889
890 /* SET_CONFIGURATION is often abused as a "cheap" driver reset,
891 * so avoid usb_set_configuration()'s kick to sysfs
892 */
893 if (status == 0) {
894 if (actconfig && actconfig->desc.bConfigurationValue == u)
895 status = usb_reset_configuration(ps->dev);
896 else
897 status = usb_set_configuration(ps->dev, u);
898 }
899
900 return status;
901 }
902
903 static int proc_do_submiturb(struct dev_state *ps, struct usbdevfs_urb *uurb,
904 struct usbdevfs_iso_packet_desc __user *iso_frame_desc,
905 void __user *arg)
906 {
907 struct usbdevfs_iso_packet_desc *isopkt = NULL;
908 struct usb_host_endpoint *ep;
909 struct async *as;
910 struct usb_ctrlrequest *dr = NULL;
911 unsigned int u, totlen, isofrmlen;
912 int ret, ifnum = -1;
913
914 if (uurb->flags & ~(USBDEVFS_URB_ISO_ASAP|USBDEVFS_URB_SHORT_NOT_OK|
915 URB_NO_FSBR|URB_ZERO_PACKET))
916 return -EINVAL;
917 if (!uurb->buffer)
918 return -EINVAL;
919 if (uurb->signr != 0 && (uurb->signr < SIGRTMIN || uurb->signr > SIGRTMAX))
920 return -EINVAL;
921 if (!(uurb->type == USBDEVFS_URB_TYPE_CONTROL && (uurb->endpoint & ~USB_ENDPOINT_DIR_MASK) == 0)) {
922 if ((ifnum = findintfep(ps->dev, uurb->endpoint)) < 0)
923 return ifnum;
924 if ((ret = checkintf(ps, ifnum)))
925 return ret;
926 }
927 if ((uurb->endpoint & USB_ENDPOINT_DIR_MASK) != 0)
928 ep = ps->dev->ep_in [uurb->endpoint & USB_ENDPOINT_NUMBER_MASK];
929 else
930 ep = ps->dev->ep_out [uurb->endpoint & USB_ENDPOINT_NUMBER_MASK];
931 if (!ep)
932 return -ENOENT;
933 switch(uurb->type) {
934 case USBDEVFS_URB_TYPE_CONTROL:
935 if ((ep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
936 != USB_ENDPOINT_XFER_CONTROL)
937 return -EINVAL;
938 /* min 8 byte setup packet, max 8 byte setup plus an arbitrary data stage */
939 if (uurb->buffer_length < 8 || uurb->buffer_length > (8 + MAX_USBFS_BUFFER_SIZE))
940 return -EINVAL;
941 if (!(dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL)))
942 return -ENOMEM;
943 if (copy_from_user(dr, uurb->buffer, 8)) {
944 kfree(dr);
945 return -EFAULT;
946 }
947 if (uurb->buffer_length < (le16_to_cpup(&dr->wLength) + 8)) {
948 kfree(dr);
949 return -EINVAL;
950 }
951 if ((ret = check_ctrlrecip(ps, dr->bRequestType, le16_to_cpup(&dr->wIndex)))) {
952 kfree(dr);
953 return ret;
954 }
955 uurb->endpoint = (uurb->endpoint & ~USB_ENDPOINT_DIR_MASK) | (dr->bRequestType & USB_ENDPOINT_DIR_MASK);
956 uurb->number_of_packets = 0;
957 uurb->buffer_length = le16_to_cpup(&dr->wLength);
958 uurb->buffer += 8;
959 if (!access_ok((uurb->endpoint & USB_DIR_IN) ? VERIFY_WRITE : VERIFY_READ, uurb->buffer, uurb->buffer_length)) {
960 kfree(dr);
961 return -EFAULT;
962 }
963 snoop(&ps->dev->dev, "control urb: bRequest=%02x "
964 "bRrequestType=%02x wValue=%04x "
965 "wIndex=%04x wLength=%04x\n",
966 dr->bRequest, dr->bRequestType, dr->wValue,
967 dr->wIndex, dr->wLength);
968 break;
969
970 case USBDEVFS_URB_TYPE_BULK:
971 switch (ep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) {
972 case USB_ENDPOINT_XFER_CONTROL:
973 case USB_ENDPOINT_XFER_ISOC:
974 return -EINVAL;
975 /* allow single-shot interrupt transfers, at bogus rates */
976 }
977 uurb->number_of_packets = 0;
978 if (uurb->buffer_length > MAX_USBFS_BUFFER_SIZE)
979 return -EINVAL;
980 if (!access_ok((uurb->endpoint & USB_DIR_IN) ? VERIFY_WRITE : VERIFY_READ, uurb->buffer, uurb->buffer_length))
981 return -EFAULT;
982 snoop(&ps->dev->dev, "bulk urb\n");
983 break;
984
985 case USBDEVFS_URB_TYPE_ISO:
986 /* arbitrary limit */
987 if (uurb->number_of_packets < 1 || uurb->number_of_packets > 128)
988 return -EINVAL;
989 if ((ep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
990 != USB_ENDPOINT_XFER_ISOC)
991 return -EINVAL;
992 isofrmlen = sizeof(struct usbdevfs_iso_packet_desc) * uurb->number_of_packets;
993 if (!(isopkt = kmalloc(isofrmlen, GFP_KERNEL)))
994 return -ENOMEM;
995 if (copy_from_user(isopkt, iso_frame_desc, isofrmlen)) {
996 kfree(isopkt);
997 return -EFAULT;
998 }
999 for (totlen = u = 0; u < uurb->number_of_packets; u++) {
1000 /* arbitrary limit, sufficient for USB 2.0 high-bandwidth iso */
1001 if (isopkt[u].length > 8192) {
1002 kfree(isopkt);
1003 return -EINVAL;
1004 }
1005 totlen += isopkt[u].length;
1006 }
1007 if (totlen > 32768) {
1008 kfree(isopkt);
1009 return -EINVAL;
1010 }
1011 uurb->buffer_length = totlen;
1012 snoop(&ps->dev->dev, "iso urb\n");
1013 break;
1014
1015 case USBDEVFS_URB_TYPE_INTERRUPT:
1016 uurb->number_of_packets = 0;
1017 if ((ep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
1018 != USB_ENDPOINT_XFER_INT)
1019 return -EINVAL;
1020 if (uurb->buffer_length > MAX_USBFS_BUFFER_SIZE)
1021 return -EINVAL;
1022 if (!access_ok((uurb->endpoint & USB_DIR_IN) ? VERIFY_WRITE : VERIFY_READ, uurb->buffer, uurb->buffer_length))
1023 return -EFAULT;
1024 snoop(&ps->dev->dev, "interrupt urb\n");
1025 break;
1026
1027 default:
1028 return -EINVAL;
1029 }
1030 if (!(as = alloc_async(uurb->number_of_packets))) {
1031 kfree(isopkt);
1032 kfree(dr);
1033 return -ENOMEM;
1034 }
1035 if (!(as->urb->transfer_buffer = kmalloc(uurb->buffer_length, GFP_KERNEL))) {
1036 kfree(isopkt);
1037 kfree(dr);
1038 free_async(as);
1039 return -ENOMEM;
1040 }
1041 as->urb->dev = ps->dev;
1042 as->urb->pipe = (uurb->type << 30) | __create_pipe(ps->dev, uurb->endpoint & 0xf) | (uurb->endpoint & USB_DIR_IN);
1043 as->urb->transfer_flags = uurb->flags;
1044 as->urb->transfer_buffer_length = uurb->buffer_length;
1045 as->urb->setup_packet = (unsigned char*)dr;
1046 as->urb->start_frame = uurb->start_frame;
1047 as->urb->number_of_packets = uurb->number_of_packets;
1048 if (uurb->type == USBDEVFS_URB_TYPE_ISO ||
1049 ps->dev->speed == USB_SPEED_HIGH)
1050 as->urb->interval = 1 << min(15, ep->desc.bInterval - 1);
1051 else
1052 as->urb->interval = ep->desc.bInterval;
1053 as->urb->context = as;
1054 as->urb->complete = async_completed;
1055 for (totlen = u = 0; u < uurb->number_of_packets; u++) {
1056 as->urb->iso_frame_desc[u].offset = totlen;
1057 as->urb->iso_frame_desc[u].length = isopkt[u].length;
1058 totlen += isopkt[u].length;
1059 }
1060 kfree(isopkt);
1061 as->ps = ps;
1062 as->userurb = arg;
1063 if (uurb->endpoint & USB_DIR_IN)
1064 as->userbuffer = uurb->buffer;
1065 else
1066 as->userbuffer = NULL;
1067 as->signr = uurb->signr;
1068 as->ifnum = ifnum;
1069 as->pid = get_pid(task_pid(current));
1070 as->uid = current->uid;
1071 as->euid = current->euid;
1072 security_task_getsecid(current, &as->secid);
1073 if (!(uurb->endpoint & USB_DIR_IN)) {
1074 if (copy_from_user(as->urb->transfer_buffer, uurb->buffer, as->urb->transfer_buffer_length)) {
1075 free_async(as);
1076 return -EFAULT;
1077 }
1078 }
1079 snoop(&as->urb->dev->dev, "submit urb\n");
1080 snoop_urb(as->urb, as->userurb);
1081 async_newpending(as);
1082 if ((ret = usb_submit_urb(as->urb, GFP_KERNEL))) {
1083 dev_printk(KERN_DEBUG, &ps->dev->dev, "usbfs: usb_submit_urb returned %d\n", ret);
1084 async_removepending(as);
1085 free_async(as);
1086 return ret;
1087 }
1088 return 0;
1089 }
1090
1091 static int proc_submiturb(struct dev_state *ps, void __user *arg)
1092 {
1093 struct usbdevfs_urb uurb;
1094
1095 if (copy_from_user(&uurb, arg, sizeof(uurb)))
1096 return -EFAULT;
1097
1098 return proc_do_submiturb(ps, &uurb, (((struct usbdevfs_urb __user *)arg)->iso_frame_desc), arg);
1099 }
1100
1101 static int proc_unlinkurb(struct dev_state *ps, void __user *arg)
1102 {
1103 struct async *as;
1104
1105 as = async_getpending(ps, arg);
1106 if (!as)
1107 return -EINVAL;
1108 usb_kill_urb(as->urb);
1109 return 0;
1110 }
1111
1112 static int processcompl(struct async *as, void __user * __user *arg)
1113 {
1114 struct urb *urb = as->urb;
1115 struct usbdevfs_urb __user *userurb = as->userurb;
1116 void __user *addr = as->userurb;
1117 unsigned int i;
1118
1119 if (as->userbuffer)
1120 if (copy_to_user(as->userbuffer, urb->transfer_buffer, urb->transfer_buffer_length))
1121 return -EFAULT;
1122 if (put_user(urb->status, &userurb->status))
1123 return -EFAULT;
1124 if (put_user(urb->actual_length, &userurb->actual_length))
1125 return -EFAULT;
1126 if (put_user(urb->error_count, &userurb->error_count))
1127 return -EFAULT;
1128
1129 if (usb_pipeisoc(urb->pipe)) {
1130 for (i = 0; i < urb->number_of_packets; i++) {
1131 if (put_user(urb->iso_frame_desc[i].actual_length,
1132 &userurb->iso_frame_desc[i].actual_length))
1133 return -EFAULT;
1134 if (put_user(urb->iso_frame_desc[i].status,
1135 &userurb->iso_frame_desc[i].status))
1136 return -EFAULT;
1137 }
1138 }
1139
1140 free_async(as);
1141
1142 if (put_user(addr, (void __user * __user *)arg))
1143 return -EFAULT;
1144 return 0;
1145 }
1146
1147 static struct async* reap_as(struct dev_state *ps)
1148 {
1149 DECLARE_WAITQUEUE(wait, current);
1150 struct async *as = NULL;
1151 struct usb_device *dev = ps->dev;
1152
1153 add_wait_queue(&ps->wait, &wait);
1154 for (;;) {
1155 __set_current_state(TASK_INTERRUPTIBLE);
1156 if ((as = async_getcompleted(ps)))
1157 break;
1158 if (signal_pending(current))
1159 break;
1160 usb_unlock_device(dev);
1161 schedule();
1162 usb_lock_device(dev);
1163 }
1164 remove_wait_queue(&ps->wait, &wait);
1165 set_current_state(TASK_RUNNING);
1166 return as;
1167 }
1168
1169 static int proc_reapurb(struct dev_state *ps, void __user *arg)
1170 {
1171 struct async *as = reap_as(ps);
1172 if (as)
1173 return processcompl(as, (void __user * __user *)arg);
1174 if (signal_pending(current))
1175 return -EINTR;
1176 return -EIO;
1177 }
1178
1179 static int proc_reapurbnonblock(struct dev_state *ps, void __user *arg)
1180 {
1181 struct async *as;
1182
1183 if (!(as = async_getcompleted(ps)))
1184 return -EAGAIN;
1185 return processcompl(as, (void __user * __user *)arg);
1186 }
1187
1188 #ifdef CONFIG_COMPAT
1189
1190 static int get_urb32(struct usbdevfs_urb *kurb,
1191 struct usbdevfs_urb32 __user *uurb)
1192 {
1193 __u32 uptr;
1194 if (get_user(kurb->type, &uurb->type) ||
1195 __get_user(kurb->endpoint, &uurb->endpoint) ||
1196 __get_user(kurb->status, &uurb->status) ||
1197 __get_user(kurb->flags, &uurb->flags) ||
1198 __get_user(kurb->buffer_length, &uurb->buffer_length) ||
1199 __get_user(kurb->actual_length, &uurb->actual_length) ||
1200 __get_user(kurb->start_frame, &uurb->start_frame) ||
1201 __get_user(kurb->number_of_packets, &uurb->number_of_packets) ||
1202 __get_user(kurb->error_count, &uurb->error_count) ||
1203 __get_user(kurb->signr, &uurb->signr))
1204 return -EFAULT;
1205
1206 if (__get_user(uptr, &uurb->buffer))
1207 return -EFAULT;
1208 kurb->buffer = compat_ptr(uptr);
1209 if (__get_user(uptr, &uurb->buffer))
1210 return -EFAULT;
1211 kurb->usercontext = compat_ptr(uptr);
1212
1213 return 0;
1214 }
1215
1216 static int proc_submiturb_compat(struct dev_state *ps, void __user *arg)
1217 {
1218 struct usbdevfs_urb uurb;
1219
1220 if (get_urb32(&uurb,(struct usbdevfs_urb32 __user *)arg))
1221 return -EFAULT;
1222
1223 return proc_do_submiturb(ps, &uurb, ((struct usbdevfs_urb32 __user *)arg)->iso_frame_desc, arg);
1224 }
1225
1226 static int processcompl_compat(struct async *as, void __user * __user *arg)
1227 {
1228 struct urb *urb = as->urb;
1229 struct usbdevfs_urb32 __user *userurb = as->userurb;
1230 void __user *addr = as->userurb;
1231 unsigned int i;
1232
1233 if (as->userbuffer)
1234 if (copy_to_user(as->userbuffer, urb->transfer_buffer, urb->transfer_buffer_length))
1235 return -EFAULT;
1236 if (put_user(urb->status, &userurb->status))
1237 return -EFAULT;
1238 if (put_user(urb->actual_length, &userurb->actual_length))
1239 return -EFAULT;
1240 if (put_user(urb->error_count, &userurb->error_count))
1241 return -EFAULT;
1242
1243 if (usb_pipeisoc(urb->pipe)) {
1244 for (i = 0; i < urb->number_of_packets; i++) {
1245 if (put_user(urb->iso_frame_desc[i].actual_length,
1246 &userurb->iso_frame_desc[i].actual_length))
1247 return -EFAULT;
1248 if (put_user(urb->iso_frame_desc[i].status,
1249 &userurb->iso_frame_desc[i].status))
1250 return -EFAULT;
1251 }
1252 }
1253
1254 free_async(as);
1255 if (put_user(ptr_to_compat(addr), (u32 __user *)arg))
1256 return -EFAULT;
1257 return 0;
1258 }
1259
1260 static int proc_reapurb_compat(struct dev_state *ps, void __user *arg)
1261 {
1262 struct async *as = reap_as(ps);
1263 if (as)
1264 return processcompl_compat(as, (void __user * __user *)arg);
1265 if (signal_pending(current))
1266 return -EINTR;
1267 return -EIO;
1268 }
1269
1270 static int proc_reapurbnonblock_compat(struct dev_state *ps, void __user *arg)
1271 {
1272 struct async *as;
1273
1274 if (!(as = async_getcompleted(ps)))
1275 return -EAGAIN;
1276 return processcompl_compat(as, (void __user * __user *)arg);
1277 }
1278
1279 #endif
1280
1281 static int proc_disconnectsignal(struct dev_state *ps, void __user *arg)
1282 {
1283 struct usbdevfs_disconnectsignal ds;
1284
1285 if (copy_from_user(&ds, arg, sizeof(ds)))
1286 return -EFAULT;
1287 if (ds.signr != 0 && (ds.signr < SIGRTMIN || ds.signr > SIGRTMAX))
1288 return -EINVAL;
1289 ps->discsignr = ds.signr;
1290 ps->disccontext = ds.context;
1291 return 0;
1292 }
1293
1294 static int proc_claiminterface(struct dev_state *ps, void __user *arg)
1295 {
1296 unsigned int ifnum;
1297
1298 if (get_user(ifnum, (unsigned int __user *)arg))
1299 return -EFAULT;
1300 return claimintf(ps, ifnum);
1301 }
1302
1303 static int proc_releaseinterface(struct dev_state *ps, void __user *arg)
1304 {
1305 unsigned int ifnum;
1306 int ret;
1307
1308 if (get_user(ifnum, (unsigned int __user *)arg))
1309 return -EFAULT;
1310 if ((ret = releaseintf(ps, ifnum)) < 0)
1311 return ret;
1312 destroy_async_on_interface (ps, ifnum);
1313 return 0;
1314 }
1315
1316 static int proc_ioctl(struct dev_state *ps, struct usbdevfs_ioctl *ctl)
1317 {
1318 int size;
1319 void *buf = NULL;
1320 int retval = 0;
1321 struct usb_interface *intf = NULL;
1322 struct usb_driver *driver = NULL;
1323
1324 /* alloc buffer */
1325 if ((size = _IOC_SIZE (ctl->ioctl_code)) > 0) {
1326 if ((buf = kmalloc (size, GFP_KERNEL)) == NULL)
1327 return -ENOMEM;
1328 if ((_IOC_DIR(ctl->ioctl_code) & _IOC_WRITE)) {
1329 if (copy_from_user (buf, ctl->data, size)) {
1330 kfree(buf);
1331 return -EFAULT;
1332 }
1333 } else {
1334 memset (buf, 0, size);
1335 }
1336 }
1337
1338 if (!connected(ps)) {
1339 kfree(buf);
1340 return -ENODEV;
1341 }
1342
1343 if (ps->dev->state != USB_STATE_CONFIGURED)
1344 retval = -EHOSTUNREACH;
1345 else if (!(intf = usb_ifnum_to_if (ps->dev, ctl->ifno)))
1346 retval = -EINVAL;
1347 else switch (ctl->ioctl_code) {
1348
1349 /* disconnect kernel driver from interface */
1350 case USBDEVFS_DISCONNECT:
1351 if (intf->dev.driver) {
1352 driver = to_usb_driver(intf->dev.driver);
1353 dev_dbg (&intf->dev, "disconnect by usbfs\n");
1354 usb_driver_release_interface(driver, intf);
1355 } else
1356 retval = -ENODATA;
1357 break;
1358
1359 /* let kernel drivers try to (re)bind to the interface */
1360 case USBDEVFS_CONNECT:
1361 usb_unlock_device(ps->dev);
1362 retval = bus_rescan_devices(intf->dev.bus);
1363 usb_lock_device(ps->dev);
1364 break;
1365
1366 /* talk directly to the interface's driver */
1367 default:
1368 if (intf->dev.driver)
1369 driver = to_usb_driver(intf->dev.driver);
1370 if (driver == NULL || driver->ioctl == NULL) {
1371 retval = -ENOTTY;
1372 } else {
1373 retval = driver->ioctl (intf, ctl->ioctl_code, buf);
1374 if (retval == -ENOIOCTLCMD)
1375 retval = -ENOTTY;
1376 }
1377 }
1378
1379 /* cleanup and return */
1380 if (retval >= 0
1381 && (_IOC_DIR (ctl->ioctl_code) & _IOC_READ) != 0
1382 && size > 0
1383 && copy_to_user (ctl->data, buf, size) != 0)
1384 retval = -EFAULT;
1385
1386 kfree(buf);
1387 return retval;
1388 }
1389
1390 static int proc_ioctl_default(struct dev_state *ps, void __user *arg)
1391 {
1392 struct usbdevfs_ioctl ctrl;
1393
1394 if (copy_from_user(&ctrl, arg, sizeof (ctrl)))
1395 return -EFAULT;
1396 return proc_ioctl(ps, &ctrl);
1397 }
1398
1399 #ifdef CONFIG_COMPAT
1400 static int proc_ioctl_compat(struct dev_state *ps, compat_uptr_t arg)
1401 {
1402 struct usbdevfs_ioctl32 __user *uioc;
1403 struct usbdevfs_ioctl ctrl;
1404 u32 udata;
1405
1406 uioc = compat_ptr((long)arg);
1407 if (get_user(ctrl.ifno, &uioc->ifno) ||
1408 get_user(ctrl.ioctl_code, &uioc->ioctl_code) ||
1409 __get_user(udata, &uioc->data))
1410 return -EFAULT;
1411 ctrl.data = compat_ptr(udata);
1412
1413 return proc_ioctl(ps, &ctrl);
1414 }
1415 #endif
1416
1417 /*
1418 * NOTE: All requests here that have interface numbers as parameters
1419 * are assuming that somehow the configuration has been prevented from
1420 * changing. But there's no mechanism to ensure that...
1421 */
1422 static int usbdev_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
1423 {
1424 struct dev_state *ps = file->private_data;
1425 struct usb_device *dev = ps->dev;
1426 void __user *p = (void __user *)arg;
1427 int ret = -ENOTTY;
1428
1429 if (!(file->f_mode & FMODE_WRITE))
1430 return -EPERM;
1431 usb_lock_device(dev);
1432 if (!connected(ps)) {
1433 usb_unlock_device(dev);
1434 return -ENODEV;
1435 }
1436
1437 switch (cmd) {
1438 case USBDEVFS_CONTROL:
1439 snoop(&dev->dev, "%s: CONTROL\n", __FUNCTION__);
1440 ret = proc_control(ps, p);
1441 if (ret >= 0)
1442 inode->i_mtime = CURRENT_TIME;
1443 break;
1444
1445 case USBDEVFS_BULK:
1446 snoop(&dev->dev, "%s: BULK\n", __FUNCTION__);
1447 ret = proc_bulk(ps, p);
1448 if (ret >= 0)
1449 inode->i_mtime = CURRENT_TIME;
1450 break;
1451
1452 case USBDEVFS_RESETEP:
1453 snoop(&dev->dev, "%s: RESETEP\n", __FUNCTION__);
1454 ret = proc_resetep(ps, p);
1455 if (ret >= 0)
1456 inode->i_mtime = CURRENT_TIME;
1457 break;
1458
1459 case USBDEVFS_RESET:
1460 snoop(&dev->dev, "%s: RESET\n", __FUNCTION__);
1461 ret = proc_resetdevice(ps);
1462 break;
1463
1464 case USBDEVFS_CLEAR_HALT:
1465 snoop(&dev->dev, "%s: CLEAR_HALT\n", __FUNCTION__);
1466 ret = proc_clearhalt(ps, p);
1467 if (ret >= 0)
1468 inode->i_mtime = CURRENT_TIME;
1469 break;
1470
1471 case USBDEVFS_GETDRIVER:
1472 snoop(&dev->dev, "%s: GETDRIVER\n", __FUNCTION__);
1473 ret = proc_getdriver(ps, p);
1474 break;
1475
1476 case USBDEVFS_CONNECTINFO:
1477 snoop(&dev->dev, "%s: CONNECTINFO\n", __FUNCTION__);
1478 ret = proc_connectinfo(ps, p);
1479 break;
1480
1481 case USBDEVFS_SETINTERFACE:
1482 snoop(&dev->dev, "%s: SETINTERFACE\n", __FUNCTION__);
1483 ret = proc_setintf(ps, p);
1484 break;
1485
1486 case USBDEVFS_SETCONFIGURATION:
1487 snoop(&dev->dev, "%s: SETCONFIGURATION\n", __FUNCTION__);
1488 ret = proc_setconfig(ps, p);
1489 break;
1490
1491 case USBDEVFS_SUBMITURB:
1492 snoop(&dev->dev, "%s: SUBMITURB\n", __FUNCTION__);
1493 ret = proc_submiturb(ps, p);
1494 if (ret >= 0)
1495 inode->i_mtime = CURRENT_TIME;
1496 break;
1497
1498 #ifdef CONFIG_COMPAT
1499
1500 case USBDEVFS_SUBMITURB32:
1501 snoop(&dev->dev, "%s: SUBMITURB32\n", __FUNCTION__);
1502 ret = proc_submiturb_compat(ps, p);
1503 if (ret >= 0)
1504 inode->i_mtime = CURRENT_TIME;
1505 break;
1506
1507 case USBDEVFS_REAPURB32:
1508 snoop(&dev->dev, "%s: REAPURB32\n", __FUNCTION__);
1509 ret = proc_reapurb_compat(ps, p);
1510 break;
1511
1512 case USBDEVFS_REAPURBNDELAY32:
1513 snoop(&dev->dev, "%s: REAPURBDELAY32\n", __FUNCTION__);
1514 ret = proc_reapurbnonblock_compat(ps, p);
1515 break;
1516
1517 case USBDEVFS_IOCTL32:
1518 snoop(&dev->dev, "%s: IOCTL\n", __FUNCTION__);
1519 ret = proc_ioctl_compat(ps, ptr_to_compat(p));
1520 break;
1521 #endif
1522
1523 case USBDEVFS_DISCARDURB:
1524 snoop(&dev->dev, "%s: DISCARDURB\n", __FUNCTION__);
1525 ret = proc_unlinkurb(ps, p);
1526 break;
1527
1528 case USBDEVFS_REAPURB:
1529 snoop(&dev->dev, "%s: REAPURB\n", __FUNCTION__);
1530 ret = proc_reapurb(ps, p);
1531 break;
1532
1533 case USBDEVFS_REAPURBNDELAY:
1534 snoop(&dev->dev, "%s: REAPURBDELAY\n", __FUNCTION__);
1535 ret = proc_reapurbnonblock(ps, p);
1536 break;
1537
1538 case USBDEVFS_DISCSIGNAL:
1539 snoop(&dev->dev, "%s: DISCSIGNAL\n", __FUNCTION__);
1540 ret = proc_disconnectsignal(ps, p);
1541 break;
1542
1543 case USBDEVFS_CLAIMINTERFACE:
1544 snoop(&dev->dev, "%s: CLAIMINTERFACE\n", __FUNCTION__);
1545 ret = proc_claiminterface(ps, p);
1546 break;
1547
1548 case USBDEVFS_RELEASEINTERFACE:
1549 snoop(&dev->dev, "%s: RELEASEINTERFACE\n", __FUNCTION__);
1550 ret = proc_releaseinterface(ps, p);
1551 break;
1552
1553 case USBDEVFS_IOCTL:
1554 snoop(&dev->dev, "%s: IOCTL\n", __FUNCTION__);
1555 ret = proc_ioctl_default(ps, p);
1556 break;
1557 }
1558 usb_unlock_device(dev);
1559 if (ret >= 0)
1560 inode->i_atime = CURRENT_TIME;
1561 return ret;
1562 }
1563
1564 /* No kernel lock - fine */
1565 static unsigned int usbdev_poll(struct file *file, struct poll_table_struct *wait)
1566 {
1567 struct dev_state *ps = file->private_data;
1568 unsigned int mask = 0;
1569
1570 poll_wait(file, &ps->wait, wait);
1571 if (file->f_mode & FMODE_WRITE && !list_empty(&ps->async_completed))
1572 mask |= POLLOUT | POLLWRNORM;
1573 if (!connected(ps))
1574 mask |= POLLERR | POLLHUP;
1575 return mask;
1576 }
1577
1578 const struct file_operations usbdev_file_operations = {
1579 .llseek = usbdev_lseek,
1580 .read = usbdev_read,
1581 .poll = usbdev_poll,
1582 .ioctl = usbdev_ioctl,
1583 .open = usbdev_open,
1584 .release = usbdev_release,
1585 };
1586
1587 #ifdef CONFIG_USB_DEVICE_CLASS
1588 static struct class *usb_classdev_class;
1589
1590 static int usb_classdev_add(struct usb_device *dev)
1591 {
1592 int minor = ((dev->bus->busnum-1) * 128) + (dev->devnum-1);
1593
1594 dev->usb_classdev = device_create(usb_classdev_class, &dev->dev,
1595 MKDEV(USB_DEVICE_MAJOR, minor),
1596 "usbdev%d.%d", dev->bus->busnum, dev->devnum);
1597 if (IS_ERR(dev->usb_classdev))
1598 return PTR_ERR(dev->usb_classdev);
1599
1600 return 0;
1601 }
1602
1603 static void usb_classdev_remove(struct usb_device *dev)
1604 {
1605 device_unregister(dev->usb_classdev);
1606 }
1607
1608 static int usb_classdev_notify(struct notifier_block *self,
1609 unsigned long action, void *dev)
1610 {
1611 switch (action) {
1612 case USB_DEVICE_ADD:
1613 if (usb_classdev_add(dev))
1614 return NOTIFY_BAD;
1615 break;
1616 case USB_DEVICE_REMOVE:
1617 usb_classdev_remove(dev);
1618 break;
1619 }
1620 return NOTIFY_OK;
1621 }
1622
1623 static struct notifier_block usbdev_nb = {
1624 .notifier_call = usb_classdev_notify,
1625 };
1626 #endif
1627
1628 static struct cdev usb_device_cdev = {
1629 .kobj = {.name = "usb_device", },
1630 .owner = THIS_MODULE,
1631 };
1632
1633 int __init usb_devio_init(void)
1634 {
1635 int retval;
1636
1637 retval = register_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX,
1638 "usb_device");
1639 if (retval) {
1640 err("unable to register minors for usb_device");
1641 goto out;
1642 }
1643 cdev_init(&usb_device_cdev, &usbdev_file_operations);
1644 retval = cdev_add(&usb_device_cdev, USB_DEVICE_DEV, USB_DEVICE_MAX);
1645 if (retval) {
1646 err("unable to get usb_device major %d", USB_DEVICE_MAJOR);
1647 goto error_cdev;
1648 }
1649 #ifdef CONFIG_USB_DEVICE_CLASS
1650 usb_classdev_class = class_create(THIS_MODULE, "usb_device");
1651 if (IS_ERR(usb_classdev_class)) {
1652 err("unable to register usb_device class");
1653 retval = PTR_ERR(usb_classdev_class);
1654 cdev_del(&usb_device_cdev);
1655 usb_classdev_class = NULL;
1656 goto out;
1657 }
1658
1659 usb_register_notify(&usbdev_nb);
1660 #endif
1661 out:
1662 return retval;
1663
1664 error_cdev:
1665 unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
1666 goto out;
1667 }
1668
1669 void usb_devio_cleanup(void)
1670 {
1671 #ifdef CONFIG_USB_DEVICE_CLASS
1672 usb_unregister_notify(&usbdev_nb);
1673 class_destroy(usb_classdev_class);
1674 #endif
1675 cdev_del(&usb_device_cdev);
1676 unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
1677 }
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