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USB: Make file operations structs in drivers/usb const.
[linux-2.6/x86.git] / drivers / usb / core / devio.c
blob43c08724a2d891976d4f54e58f23e21f32eaa121
1 /*****************************************************************************/
2
3 /*
4 * devio.c -- User space communication with USB devices.
5 *
6 * Copyright (C) 1999-2000 Thomas Sailer (sailer@ife.ee.ethz.ch)
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
21 *
22 * $Id: devio.c,v 1.7 2000/02/01 17:28:48 fliegl Exp $
23 *
24 * This file implements the usbfs/x/y files, where
25 * x is the bus number and y the device number.
26 *
27 * It allows user space programs/"drivers" to communicate directly
28 * with USB devices without intervening kernel driver.
29 *
30 * Revision history
31 * 22.12.1999 0.1 Initial release (split from proc_usb.c)
32 * 04.01.2000 0.2 Turned into its own filesystem
33 * 30.09.2005 0.3 Fix user-triggerable oops in async URB delivery
34 * (CAN-2005-3055)
35 */
36
37 /*****************************************************************************/
38
39 #include <linux/fs.h>
40 #include <linux/mm.h>
41 #include <linux/slab.h>
42 #include <linux/smp_lock.h>
43 #include <linux/signal.h>
44 #include <linux/poll.h>
45 #include <linux/module.h>
46 #include <linux/usb.h>
47 #include <linux/usbdevice_fs.h>
48 #include <linux/cdev.h>
49 #include <linux/notifier.h>
50 #include <linux/security.h>
51 #include <asm/uaccess.h>
52 #include <asm/byteorder.h>
53 #include <linux/moduleparam.h>
54
55 #include "hcd.h" /* for usbcore internals */
56 #include "usb.h"
57
58 #define USB_MAXBUS 64
59 #define USB_DEVICE_MAX USB_MAXBUS * 128
60 static struct class *usb_device_class;
61
62 /* Mutual exclusion for removal, open, and release */
63 DEFINE_MUTEX(usbfs_mutex);
64
65 struct async {
66 struct list_head asynclist;
67 struct dev_state *ps;
68 pid_t pid;
69 uid_t uid, euid;
70 unsigned int signr;
71 unsigned int ifnum;
72 void __user *userbuffer;
73 void __user *userurb;
74 struct urb *urb;
75 u32 secid;
76 };
77
78 static int usbfs_snoop = 0;
79 module_param (usbfs_snoop, bool, S_IRUGO | S_IWUSR);
80 MODULE_PARM_DESC (usbfs_snoop, "true to log all usbfs traffic");
81
82 #define snoop(dev, format, arg...) \
83 do { \
84 if (usbfs_snoop) \
85 dev_info( dev , format , ## arg); \
86 } while (0)
87
88 #define USB_DEVICE_DEV MKDEV(USB_DEVICE_MAJOR, 0)
89
90
91 #define MAX_USBFS_BUFFER_SIZE 16384
92
93 static inline int connected (struct dev_state *ps)
94 {
95 return (!list_empty(&ps->list) &&
96 ps->dev->state != USB_STATE_NOTATTACHED);
97 }
98
99 static loff_t usbdev_lseek(struct file *file, loff_t offset, int orig)
100 {
101 loff_t ret;
102
103 lock_kernel();
104
105 switch (orig) {
106 case 0:
107 file->f_pos = offset;
108 ret = file->f_pos;
109 break;
110 case 1:
111 file->f_pos += offset;
112 ret = file->f_pos;
113 break;
114 case 2:
115 default:
116 ret = -EINVAL;
117 }
118
119 unlock_kernel();
120 return ret;
121 }
122
123 static ssize_t usbdev_read(struct file *file, char __user *buf, size_t nbytes, loff_t *ppos)
124 {
125 struct dev_state *ps = (struct dev_state *)file->private_data;
126 struct usb_device *dev = ps->dev;
127 ssize_t ret = 0;
128 unsigned len;
129 loff_t pos;
130 int i;
131
132 pos = *ppos;
133 usb_lock_device(dev);
134 if (!connected(ps)) {
135 ret = -ENODEV;
136 goto err;
137 } else if (pos < 0) {
138 ret = -EINVAL;
139 goto err;
140 }
141
142 if (pos < sizeof(struct usb_device_descriptor)) {
143 struct usb_device_descriptor temp_desc ; /* 18 bytes - fits on the stack */
144
145 memcpy(&temp_desc, &dev->descriptor, sizeof(dev->descriptor));
146 le16_to_cpus(&temp_desc.bcdUSB);
147 le16_to_cpus(&temp_desc.idVendor);
148 le16_to_cpus(&temp_desc.idProduct);
149 le16_to_cpus(&temp_desc.bcdDevice);
150
151 len = sizeof(struct usb_device_descriptor) - pos;
152 if (len > nbytes)
153 len = nbytes;
154 if (copy_to_user(buf, ((char *)&temp_desc) + pos, len)) {
155 ret = -EFAULT;
156 goto err;
157 }
158
159 *ppos += len;
160 buf += len;
161 nbytes -= len;
162 ret += len;
163 }
164
165 pos = sizeof(struct usb_device_descriptor);
166 for (i = 0; nbytes && i < dev->descriptor.bNumConfigurations; i++) {
167 struct usb_config_descriptor *config =
168 (struct usb_config_descriptor *)dev->rawdescriptors[i];
169 unsigned int length = le16_to_cpu(config->wTotalLength);
170
171 if (*ppos < pos + length) {
172
173 /* The descriptor may claim to be longer than it
174 * really is. Here is the actual allocated length. */
175 unsigned alloclen =
176 le16_to_cpu(dev->config[i].desc.wTotalLength);
177
178 len = length - (*ppos - pos);
179 if (len > nbytes)
180 len = nbytes;
181
182 /* Simply don't write (skip over) unallocated parts */
183 if (alloclen > (*ppos - pos)) {
184 alloclen -= (*ppos - pos);
185 if (copy_to_user(buf,
186 dev->rawdescriptors[i] + (*ppos - pos),
187 min(len, alloclen))) {
188 ret = -EFAULT;
189 goto err;
190 }
191 }
192
193 *ppos += len;
194 buf += len;
195 nbytes -= len;
196 ret += len;
197 }
198
199 pos += length;
200 }
201
202 err:
203 usb_unlock_device(dev);
204 return ret;
205 }
206
207 /*
208 * async list handling
209 */
210
211 static struct async *alloc_async(unsigned int numisoframes)
212 {
213 unsigned int assize = sizeof(struct async) + numisoframes * sizeof(struct usb_iso_packet_descriptor);
214 struct async *as = kzalloc(assize, GFP_KERNEL);
215
216 if (!as)
217 return NULL;
218 as->urb = usb_alloc_urb(numisoframes, GFP_KERNEL);
219 if (!as->urb) {
220 kfree(as);
221 return NULL;
222 }
223 return as;
224 }
225
226 static void free_async(struct async *as)
227 {
228 kfree(as->urb->transfer_buffer);
229 kfree(as->urb->setup_packet);
230 usb_free_urb(as->urb);
231 kfree(as);
232 }
233
234 static inline void async_newpending(struct async *as)
235 {
236 struct dev_state *ps = as->ps;
237 unsigned long flags;
238
239 spin_lock_irqsave(&ps->lock, flags);
240 list_add_tail(&as->asynclist, &ps->async_pending);
241 spin_unlock_irqrestore(&ps->lock, flags);
242 }
243
244 static inline void async_removepending(struct async *as)
245 {
246 struct dev_state *ps = as->ps;
247 unsigned long flags;
248
249 spin_lock_irqsave(&ps->lock, flags);
250 list_del_init(&as->asynclist);
251 spin_unlock_irqrestore(&ps->lock, flags);
252 }
253
254 static inline struct async *async_getcompleted(struct dev_state *ps)
255 {
256 unsigned long flags;
257 struct async *as = NULL;
258
259 spin_lock_irqsave(&ps->lock, flags);
260 if (!list_empty(&ps->async_completed)) {
261 as = list_entry(ps->async_completed.next, struct async, asynclist);
262 list_del_init(&as->asynclist);
263 }
264 spin_unlock_irqrestore(&ps->lock, flags);
265 return as;
266 }
267
268 static inline struct async *async_getpending(struct dev_state *ps, void __user *userurb)
269 {
270 unsigned long flags;
271 struct async *as;
272
273 spin_lock_irqsave(&ps->lock, flags);
274 list_for_each_entry(as, &ps->async_pending, asynclist)
275 if (as->userurb == userurb) {
276 list_del_init(&as->asynclist);
277 spin_unlock_irqrestore(&ps->lock, flags);
278 return as;
279 }
280 spin_unlock_irqrestore(&ps->lock, flags);
281 return NULL;
282 }
283
284 static void snoop_urb(struct urb *urb, void __user *userurb)
285 {
286 int j;
287 unsigned char *data = urb->transfer_buffer;
288
289 if (!usbfs_snoop)
290 return;
291
292 if (urb->pipe & USB_DIR_IN)
293 dev_info(&urb->dev->dev, "direction=IN\n");
294 else
295 dev_info(&urb->dev->dev, "direction=OUT\n");
296 dev_info(&urb->dev->dev, "userurb=%p\n", userurb);
297 dev_info(&urb->dev->dev, "transfer_buffer_length=%d\n",
298 urb->transfer_buffer_length);
299 dev_info(&urb->dev->dev, "actual_length=%d\n", urb->actual_length);
300 dev_info(&urb->dev->dev, "data: ");
301 for (j = 0; j < urb->transfer_buffer_length; ++j)
302 printk ("%02x ", data[j]);
303 printk("\n");
304 }
305
306 static void async_completed(struct urb *urb, struct pt_regs *regs)
307 {
308 struct async *as = (struct async *)urb->context;
309 struct dev_state *ps = as->ps;
310 struct siginfo sinfo;
311
312 spin_lock(&ps->lock);
313 list_move_tail(&as->asynclist, &ps->async_completed);
314 spin_unlock(&ps->lock);
315 if (as->signr) {
316 sinfo.si_signo = as->signr;
317 sinfo.si_errno = as->urb->status;
318 sinfo.si_code = SI_ASYNCIO;
319 sinfo.si_addr = as->userurb;
320 kill_proc_info_as_uid(as->signr, &sinfo, as->pid, as->uid,
321 as->euid, as->secid);
322 }
323 snoop(&urb->dev->dev, "urb complete\n");
324 snoop_urb(urb, as->userurb);
325 wake_up(&ps->wait);
326 }
327
328 static void destroy_async (struct dev_state *ps, struct list_head *list)
329 {
330 struct async *as;
331 unsigned long flags;
332
333 spin_lock_irqsave(&ps->lock, flags);
334 while (!list_empty(list)) {
335 as = list_entry(list->next, struct async, asynclist);
336 list_del_init(&as->asynclist);
337
338 /* drop the spinlock so the completion handler can run */
339 spin_unlock_irqrestore(&ps->lock, flags);
340 usb_kill_urb(as->urb);
341 spin_lock_irqsave(&ps->lock, flags);
342 }
343 spin_unlock_irqrestore(&ps->lock, flags);
344 as = async_getcompleted(ps);
345 while (as) {
346 free_async(as);
347 as = async_getcompleted(ps);
348 }
349 }
350
351 static void destroy_async_on_interface (struct dev_state *ps, unsigned int ifnum)
352 {
353 struct list_head *p, *q, hitlist;
354 unsigned long flags;
355
356 INIT_LIST_HEAD(&hitlist);
357 spin_lock_irqsave(&ps->lock, flags);
358 list_for_each_safe(p, q, &ps->async_pending)
359 if (ifnum == list_entry(p, struct async, asynclist)->ifnum)
360 list_move_tail(p, &hitlist);
361 spin_unlock_irqrestore(&ps->lock, flags);
362 destroy_async(ps, &hitlist);
363 }
364
365 static inline void destroy_all_async(struct dev_state *ps)
366 {
367 destroy_async(ps, &ps->async_pending);
368 }
369
370 /*
371 * interface claims are made only at the request of user level code,
372 * which can also release them (explicitly or by closing files).
373 * they're also undone when devices disconnect.
374 */
375
376 static int driver_probe (struct usb_interface *intf,
377 const struct usb_device_id *id)
378 {
379 return -ENODEV;
380 }
381
382 static void driver_disconnect(struct usb_interface *intf)
383 {
384 struct dev_state *ps = usb_get_intfdata (intf);
385 unsigned int ifnum = intf->altsetting->desc.bInterfaceNumber;
386
387 if (!ps)
388 return;
389
390 /* NOTE: this relies on usbcore having canceled and completed
391 * all pending I/O requests; 2.6 does that.
392 */
393
394 if (likely(ifnum < 8*sizeof(ps->ifclaimed)))
395 clear_bit(ifnum, &ps->ifclaimed);
396 else
397 warn("interface number %u out of range", ifnum);
398
399 usb_set_intfdata (intf, NULL);
400
401 /* force async requests to complete */
402 destroy_async_on_interface(ps, ifnum);
403 }
404
405 struct usb_driver usbfs_driver = {
406 .name = "usbfs",
407 .probe = driver_probe,
408 .disconnect = driver_disconnect,
409 };
410
411 static int claimintf(struct dev_state *ps, unsigned int ifnum)
412 {
413 struct usb_device *dev = ps->dev;
414 struct usb_interface *intf;
415 int err;
416
417 if (ifnum >= 8*sizeof(ps->ifclaimed))
418 return -EINVAL;
419 /* already claimed */
420 if (test_bit(ifnum, &ps->ifclaimed))
421 return 0;
422
423 /* lock against other changes to driver bindings */
424 down_write(&usb_bus_type.subsys.rwsem);
425 intf = usb_ifnum_to_if(dev, ifnum);
426 if (!intf)
427 err = -ENOENT;
428 else
429 err = usb_driver_claim_interface(&usbfs_driver, intf, ps);
430 up_write(&usb_bus_type.subsys.rwsem);
431 if (err == 0)
432 set_bit(ifnum, &ps->ifclaimed);
433 return err;
434 }
435
436 static int releaseintf(struct dev_state *ps, unsigned int ifnum)
437 {
438 struct usb_device *dev;
439 struct usb_interface *intf;
440 int err;
441
442 err = -EINVAL;
443 if (ifnum >= 8*sizeof(ps->ifclaimed))
444 return err;
445 dev = ps->dev;
446 /* lock against other changes to driver bindings */
447 down_write(&usb_bus_type.subsys.rwsem);
448 intf = usb_ifnum_to_if(dev, ifnum);
449 if (!intf)
450 err = -ENOENT;
451 else if (test_and_clear_bit(ifnum, &ps->ifclaimed)) {
452 usb_driver_release_interface(&usbfs_driver, intf);
453 err = 0;
454 }
455 up_write(&usb_bus_type.subsys.rwsem);
456 return err;
457 }
458
459 static int checkintf(struct dev_state *ps, unsigned int ifnum)
460 {
461 if (ps->dev->state != USB_STATE_CONFIGURED)
462 return -EHOSTUNREACH;
463 if (ifnum >= 8*sizeof(ps->ifclaimed))
464 return -EINVAL;
465 if (test_bit(ifnum, &ps->ifclaimed))
466 return 0;
467 /* if not yet claimed, claim it for the driver */
468 dev_warn(&ps->dev->dev, "usbfs: process %d (%s) did not claim interface %u before use\n",
469 current->pid, current->comm, ifnum);
470 return claimintf(ps, ifnum);
471 }
472
473 static int findintfep(struct usb_device *dev, unsigned int ep)
474 {
475 unsigned int i, j, e;
476 struct usb_interface *intf;
477 struct usb_host_interface *alts;
478 struct usb_endpoint_descriptor *endpt;
479
480 if (ep & ~(USB_DIR_IN|0xf))
481 return -EINVAL;
482 if (!dev->actconfig)
483 return -ESRCH;
484 for (i = 0; i < dev->actconfig->desc.bNumInterfaces; i++) {
485 intf = dev->actconfig->interface[i];
486 for (j = 0; j < intf->num_altsetting; j++) {
487 alts = &intf->altsetting[j];
488 for (e = 0; e < alts->desc.bNumEndpoints; e++) {
489 endpt = &alts->endpoint[e].desc;
490 if (endpt->bEndpointAddress == ep)
491 return alts->desc.bInterfaceNumber;
492 }
493 }
494 }
495 return -ENOENT;
496 }
497
498 static int check_ctrlrecip(struct dev_state *ps, unsigned int requesttype, unsigned int index)
499 {
500 int ret = 0;
501
502 if (ps->dev->state != USB_STATE_ADDRESS
503 && ps->dev->state != USB_STATE_CONFIGURED)
504 return -EHOSTUNREACH;
505 if (USB_TYPE_VENDOR == (USB_TYPE_MASK & requesttype))
506 return 0;
507
508 index &= 0xff;
509 switch (requesttype & USB_RECIP_MASK) {
510 case USB_RECIP_ENDPOINT:
511 if ((ret = findintfep(ps->dev, index)) >= 0)
512 ret = checkintf(ps, ret);
513 break;
514
515 case USB_RECIP_INTERFACE:
516 ret = checkintf(ps, index);
517 break;
518 }
519 return ret;
520 }
521
522 static struct usb_device *usbdev_lookup_minor(int minor)
523 {
524 struct class_device *class_dev;
525 struct usb_device *dev = NULL;
526
527 down(&usb_device_class->sem);
528 list_for_each_entry(class_dev, &usb_device_class->children, node) {
529 if (class_dev->devt == MKDEV(USB_DEVICE_MAJOR, minor)) {
530 dev = class_dev->class_data;
531 break;
532 }
533 }
534 up(&usb_device_class->sem);
535
536 return dev;
537 };
538
539 /*
540 * file operations
541 */
542 static int usbdev_open(struct inode *inode, struct file *file)
543 {
544 struct usb_device *dev = NULL;
545 struct dev_state *ps;
546 int ret;
547
548 /* Protect against simultaneous removal or release */
549 mutex_lock(&usbfs_mutex);
550
551 ret = -ENOMEM;
552 if (!(ps = kmalloc(sizeof(struct dev_state), GFP_KERNEL)))
553 goto out;
554
555 ret = -ENOENT;
556 /* check if we are called from a real node or usbfs */
557 if (imajor(inode) == USB_DEVICE_MAJOR)
558 dev = usbdev_lookup_minor(iminor(inode));
559 if (!dev)
560 dev = inode->i_private;
561 if (!dev) {
562 kfree(ps);
563 goto out;
564 }
565 usb_get_dev(dev);
566 ret = 0;
567 ps->dev = dev;
568 ps->file = file;
569 spin_lock_init(&ps->lock);
570 INIT_LIST_HEAD(&ps->async_pending);
571 INIT_LIST_HEAD(&ps->async_completed);
572 init_waitqueue_head(&ps->wait);
573 ps->discsignr = 0;
574 ps->disc_pid = current->pid;
575 ps->disc_uid = current->uid;
576 ps->disc_euid = current->euid;
577 ps->disccontext = NULL;
578 ps->ifclaimed = 0;
579 security_task_getsecid(current, &ps->secid);
580 wmb();
581 list_add_tail(&ps->list, &dev->filelist);
582 file->private_data = ps;
583 out:
584 mutex_unlock(&usbfs_mutex);
585 return ret;
586 }
587
588 static int usbdev_release(struct inode *inode, struct file *file)
589 {
590 struct dev_state *ps = (struct dev_state *)file->private_data;
591 struct usb_device *dev = ps->dev;
592 unsigned int ifnum;
593
594 usb_lock_device(dev);
595
596 /* Protect against simultaneous open */
597 mutex_lock(&usbfs_mutex);
598 list_del_init(&ps->list);
599 mutex_unlock(&usbfs_mutex);
600
601 for (ifnum = 0; ps->ifclaimed && ifnum < 8*sizeof(ps->ifclaimed);
602 ifnum++) {
603 if (test_bit(ifnum, &ps->ifclaimed))
604 releaseintf(ps, ifnum);
605 }
606 destroy_all_async(ps);
607 usb_unlock_device(dev);
608 usb_put_dev(dev);
609 kfree(ps);
610 return 0;
611 }
612
613 static int proc_control(struct dev_state *ps, void __user *arg)
614 {
615 struct usb_device *dev = ps->dev;
616 struct usbdevfs_ctrltransfer ctrl;
617 unsigned int tmo;
618 unsigned char *tbuf;
619 int i, j, ret;
620
621 if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
622 return -EFAULT;
623 if ((ret = check_ctrlrecip(ps, ctrl.bRequestType, ctrl.wIndex)))
624 return ret;
625 if (ctrl.wLength > PAGE_SIZE)
626 return -EINVAL;
627 if (!(tbuf = (unsigned char *)__get_free_page(GFP_KERNEL)))
628 return -ENOMEM;
629 tmo = ctrl.timeout;
630 if (ctrl.bRequestType & 0x80) {
631 if (ctrl.wLength && !access_ok(VERIFY_WRITE, ctrl.data, ctrl.wLength)) {
632 free_page((unsigned long)tbuf);
633 return -EINVAL;
634 }
635 snoop(&dev->dev, "control read: bRequest=%02x "
636 "bRrequestType=%02x wValue=%04x "
637 "wIndex=%04x wLength=%04x\n",
638 ctrl.bRequest, ctrl.bRequestType, ctrl.wValue,
639 ctrl.wIndex, ctrl.wLength);
640
641 usb_unlock_device(dev);
642 i = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), ctrl.bRequest, ctrl.bRequestType,
643 ctrl.wValue, ctrl.wIndex, tbuf, ctrl.wLength, tmo);
644 usb_lock_device(dev);
645 if ((i > 0) && ctrl.wLength) {
646 if (usbfs_snoop) {
647 dev_info(&dev->dev, "control read: data ");
648 for (j = 0; j < i; ++j)
649 printk("%02x ", (unsigned char)(tbuf)[j]);
650 printk("\n");
651 }
652 if (copy_to_user(ctrl.data, tbuf, i)) {
653 free_page((unsigned long)tbuf);
654 return -EFAULT;
655 }
656 }
657 } else {
658 if (ctrl.wLength) {
659 if (copy_from_user(tbuf, ctrl.data, ctrl.wLength)) {
660 free_page((unsigned long)tbuf);
661 return -EFAULT;
662 }
663 }
664 snoop(&dev->dev, "control write: bRequest=%02x "
665 "bRrequestType=%02x wValue=%04x "
666 "wIndex=%04x wLength=%04x\n",
667 ctrl.bRequest, ctrl.bRequestType, ctrl.wValue,
668 ctrl.wIndex, ctrl.wLength);
669 if (usbfs_snoop) {
670 dev_info(&dev->dev, "control write: data: ");
671 for (j = 0; j < ctrl.wLength; ++j)
672 printk("%02x ", (unsigned char)(tbuf)[j]);
673 printk("\n");
674 }
675 usb_unlock_device(dev);
676 i = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), ctrl.bRequest, ctrl.bRequestType,
677 ctrl.wValue, ctrl.wIndex, tbuf, ctrl.wLength, tmo);
678 usb_lock_device(dev);
679 }
680 free_page((unsigned long)tbuf);
681 if (i<0 && i != -EPIPE) {
682 dev_printk(KERN_DEBUG, &dev->dev, "usbfs: USBDEVFS_CONTROL "
683 "failed cmd %s rqt %u rq %u len %u ret %d\n",
684 current->comm, ctrl.bRequestType, ctrl.bRequest,
685 ctrl.wLength, i);
686 }
687 return i;
688 }
689
690 static int proc_bulk(struct dev_state *ps, void __user *arg)
691 {
692 struct usb_device *dev = ps->dev;
693 struct usbdevfs_bulktransfer bulk;
694 unsigned int tmo, len1, pipe;
695 int len2;
696 unsigned char *tbuf;
697 int i, j, ret;
698
699 if (copy_from_user(&bulk, arg, sizeof(bulk)))
700 return -EFAULT;
701 if ((ret = findintfep(ps->dev, bulk.ep)) < 0)
702 return ret;
703 if ((ret = checkintf(ps, ret)))
704 return ret;
705 if (bulk.ep & USB_DIR_IN)
706 pipe = usb_rcvbulkpipe(dev, bulk.ep & 0x7f);
707 else
708 pipe = usb_sndbulkpipe(dev, bulk.ep & 0x7f);
709 if (!usb_maxpacket(dev, pipe, !(bulk.ep & USB_DIR_IN)))
710 return -EINVAL;
711 len1 = bulk.len;
712 if (len1 > MAX_USBFS_BUFFER_SIZE)
713 return -EINVAL;
714 if (!(tbuf = kmalloc(len1, GFP_KERNEL)))
715 return -ENOMEM;
716 tmo = bulk.timeout;
717 if (bulk.ep & 0x80) {
718 if (len1 && !access_ok(VERIFY_WRITE, bulk.data, len1)) {
719 kfree(tbuf);
720 return -EINVAL;
721 }
722 snoop(&dev->dev, "bulk read: len=0x%02x timeout=%04d\n",
723 bulk.len, bulk.timeout);
724 usb_unlock_device(dev);
725 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
726 usb_lock_device(dev);
727 if (!i && len2) {
728 if (usbfs_snoop) {
729 dev_info(&dev->dev, "bulk read: data ");
730 for (j = 0; j < len2; ++j)
731 printk("%02x ", (unsigned char)(tbuf)[j]);
732 printk("\n");
733 }
734 if (copy_to_user(bulk.data, tbuf, len2)) {
735 kfree(tbuf);
736 return -EFAULT;
737 }
738 }
739 } else {
740 if (len1) {
741 if (copy_from_user(tbuf, bulk.data, len1)) {
742 kfree(tbuf);
743 return -EFAULT;
744 }
745 }
746 snoop(&dev->dev, "bulk write: len=0x%02x timeout=%04d\n",
747 bulk.len, bulk.timeout);
748 if (usbfs_snoop) {
749 dev_info(&dev->dev, "bulk write: data: ");
750 for (j = 0; j < len1; ++j)
751 printk("%02x ", (unsigned char)(tbuf)[j]);
752 printk("\n");
753 }
754 usb_unlock_device(dev);
755 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
756 usb_lock_device(dev);
757 }
758 kfree(tbuf);
759 if (i < 0)
760 return i;
761 return len2;
762 }
763
764 static int proc_resetep(struct dev_state *ps, void __user *arg)
765 {
766 unsigned int ep;
767 int ret;
768
769 if (get_user(ep, (unsigned int __user *)arg))
770 return -EFAULT;
771 if ((ret = findintfep(ps->dev, ep)) < 0)
772 return ret;
773 if ((ret = checkintf(ps, ret)))
774 return ret;
775 usb_settoggle(ps->dev, ep & 0xf, !(ep & USB_DIR_IN), 0);
776 return 0;
777 }
778
779 static int proc_clearhalt(struct dev_state *ps, void __user *arg)
780 {
781 unsigned int ep;
782 int pipe;
783 int ret;
784
785 if (get_user(ep, (unsigned int __user *)arg))
786 return -EFAULT;
787 if ((ret = findintfep(ps->dev, ep)) < 0)
788 return ret;
789 if ((ret = checkintf(ps, ret)))
790 return ret;
791 if (ep & USB_DIR_IN)
792 pipe = usb_rcvbulkpipe(ps->dev, ep & 0x7f);
793 else
794 pipe = usb_sndbulkpipe(ps->dev, ep & 0x7f);
795
796 return usb_clear_halt(ps->dev, pipe);
797 }
798
799
800 static int proc_getdriver(struct dev_state *ps, void __user *arg)
801 {
802 struct usbdevfs_getdriver gd;
803 struct usb_interface *intf;
804 int ret;
805
806 if (copy_from_user(&gd, arg, sizeof(gd)))
807 return -EFAULT;
808 down_read(&usb_bus_type.subsys.rwsem);
809 intf = usb_ifnum_to_if(ps->dev, gd.interface);
810 if (!intf || !intf->dev.driver)
811 ret = -ENODATA;
812 else {
813 strncpy(gd.driver, intf->dev.driver->name,
814 sizeof(gd.driver));
815 ret = (copy_to_user(arg, &gd, sizeof(gd)) ? -EFAULT : 0);
816 }
817 up_read(&usb_bus_type.subsys.rwsem);
818 return ret;
819 }
820
821 static int proc_connectinfo(struct dev_state *ps, void __user *arg)
822 {
823 struct usbdevfs_connectinfo ci;
824
825 ci.devnum = ps->dev->devnum;
826 ci.slow = ps->dev->speed == USB_SPEED_LOW;
827 if (copy_to_user(arg, &ci, sizeof(ci)))
828 return -EFAULT;
829 return 0;
830 }
831
832 static int proc_resetdevice(struct dev_state *ps)
833 {
834 return usb_reset_composite_device(ps->dev, NULL);
835 }
836
837 static int proc_setintf(struct dev_state *ps, void __user *arg)
838 {
839 struct usbdevfs_setinterface setintf;
840 int ret;
841
842 if (copy_from_user(&setintf, arg, sizeof(setintf)))
843 return -EFAULT;
844 if ((ret = checkintf(ps, setintf.interface)))
845 return ret;
846 return usb_set_interface(ps->dev, setintf.interface,
847 setintf.altsetting);
848 }
849
850 static int proc_setconfig(struct dev_state *ps, void __user *arg)
851 {
852 unsigned int u;
853 int status = 0;
854 struct usb_host_config *actconfig;
855
856 if (get_user(u, (unsigned int __user *)arg))
857 return -EFAULT;
858
859 actconfig = ps->dev->actconfig;
860
861 /* Don't touch the device if any interfaces are claimed.
862 * It could interfere with other drivers' operations, and if
863 * an interface is claimed by usbfs it could easily deadlock.
864 */
865 if (actconfig) {
866 int i;
867
868 for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) {
869 if (usb_interface_claimed(actconfig->interface[i])) {
870 dev_warn (&ps->dev->dev,
871 "usbfs: interface %d claimed by %s "
872 "while '%s' sets config #%d\n",
873 actconfig->interface[i]
874 ->cur_altsetting
875 ->desc.bInterfaceNumber,
876 actconfig->interface[i]
877 ->dev.driver->name,
878 current->comm, u);
879 status = -EBUSY;
880 break;
881 }
882 }
883 }
884
885 /* SET_CONFIGURATION is often abused as a "cheap" driver reset,
886 * so avoid usb_set_configuration()'s kick to sysfs
887 */
888 if (status == 0) {
889 if (actconfig && actconfig->desc.bConfigurationValue == u)
890 status = usb_reset_configuration(ps->dev);
891 else
892 status = usb_set_configuration(ps->dev, u);
893 }
894
895 return status;
896 }
897
898 static int proc_do_submiturb(struct dev_state *ps, struct usbdevfs_urb *uurb,
899 struct usbdevfs_iso_packet_desc __user *iso_frame_desc,
900 void __user *arg)
901 {
902 struct usbdevfs_iso_packet_desc *isopkt = NULL;
903 struct usb_host_endpoint *ep;
904 struct async *as;
905 struct usb_ctrlrequest *dr = NULL;
906 unsigned int u, totlen, isofrmlen;
907 int ret, interval = 0, ifnum = -1;
908
909 if (uurb->flags & ~(USBDEVFS_URB_ISO_ASAP|USBDEVFS_URB_SHORT_NOT_OK|
910 URB_NO_FSBR|URB_ZERO_PACKET))
911 return -EINVAL;
912 if (!uurb->buffer)
913 return -EINVAL;
914 if (uurb->signr != 0 && (uurb->signr < SIGRTMIN || uurb->signr > SIGRTMAX))
915 return -EINVAL;
916 if (!(uurb->type == USBDEVFS_URB_TYPE_CONTROL && (uurb->endpoint & ~USB_ENDPOINT_DIR_MASK) == 0)) {
917 if ((ifnum = findintfep(ps->dev, uurb->endpoint)) < 0)
918 return ifnum;
919 if ((ret = checkintf(ps, ifnum)))
920 return ret;
921 }
922 if ((uurb->endpoint & USB_ENDPOINT_DIR_MASK) != 0)
923 ep = ps->dev->ep_in [uurb->endpoint & USB_ENDPOINT_NUMBER_MASK];
924 else
925 ep = ps->dev->ep_out [uurb->endpoint & USB_ENDPOINT_NUMBER_MASK];
926 if (!ep)
927 return -ENOENT;
928 switch(uurb->type) {
929 case USBDEVFS_URB_TYPE_CONTROL:
930 if ((ep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
931 != USB_ENDPOINT_XFER_CONTROL)
932 return -EINVAL;
933 /* min 8 byte setup packet, max 8 byte setup plus an arbitrary data stage */
934 if (uurb->buffer_length < 8 || uurb->buffer_length > (8 + MAX_USBFS_BUFFER_SIZE))
935 return -EINVAL;
936 if (!(dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL)))
937 return -ENOMEM;
938 if (copy_from_user(dr, uurb->buffer, 8)) {
939 kfree(dr);
940 return -EFAULT;
941 }
942 if (uurb->buffer_length < (le16_to_cpup(&dr->wLength) + 8)) {
943 kfree(dr);
944 return -EINVAL;
945 }
946 if ((ret = check_ctrlrecip(ps, dr->bRequestType, le16_to_cpup(&dr->wIndex)))) {
947 kfree(dr);
948 return ret;
949 }
950 uurb->endpoint = (uurb->endpoint & ~USB_ENDPOINT_DIR_MASK) | (dr->bRequestType & USB_ENDPOINT_DIR_MASK);
951 uurb->number_of_packets = 0;
952 uurb->buffer_length = le16_to_cpup(&dr->wLength);
953 uurb->buffer += 8;
954 if (!access_ok((uurb->endpoint & USB_DIR_IN) ? VERIFY_WRITE : VERIFY_READ, uurb->buffer, uurb->buffer_length)) {
955 kfree(dr);
956 return -EFAULT;
957 }
958 snoop(&ps->dev->dev, "control urb\n");
959 break;
960
961 case USBDEVFS_URB_TYPE_BULK:
962 switch (ep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) {
963 case USB_ENDPOINT_XFER_CONTROL:
964 case USB_ENDPOINT_XFER_ISOC:
965 return -EINVAL;
966 /* allow single-shot interrupt transfers, at bogus rates */
967 }
968 uurb->number_of_packets = 0;
969 if (uurb->buffer_length > MAX_USBFS_BUFFER_SIZE)
970 return -EINVAL;
971 if (!access_ok((uurb->endpoint & USB_DIR_IN) ? VERIFY_WRITE : VERIFY_READ, uurb->buffer, uurb->buffer_length))
972 return -EFAULT;
973 snoop(&ps->dev->dev, "bulk urb\n");
974 break;
975
976 case USBDEVFS_URB_TYPE_ISO:
977 /* arbitrary limit */
978 if (uurb->number_of_packets < 1 || uurb->number_of_packets > 128)
979 return -EINVAL;
980 if ((ep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
981 != USB_ENDPOINT_XFER_ISOC)
982 return -EINVAL;
983 interval = 1 << min (15, ep->desc.bInterval - 1);
984 isofrmlen = sizeof(struct usbdevfs_iso_packet_desc) * uurb->number_of_packets;
985 if (!(isopkt = kmalloc(isofrmlen, GFP_KERNEL)))
986 return -ENOMEM;
987 if (copy_from_user(isopkt, iso_frame_desc, isofrmlen)) {
988 kfree(isopkt);
989 return -EFAULT;
990 }
991 for (totlen = u = 0; u < uurb->number_of_packets; u++) {
992 /* arbitrary limit, sufficient for USB 2.0 high-bandwidth iso */
993 if (isopkt[u].length > 8192) {
994 kfree(isopkt);
995 return -EINVAL;
996 }
997 totlen += isopkt[u].length;
998 }
999 if (totlen > 32768) {
1000 kfree(isopkt);
1001 return -EINVAL;
1002 }
1003 uurb->buffer_length = totlen;
1004 snoop(&ps->dev->dev, "iso urb\n");
1005 break;
1006
1007 case USBDEVFS_URB_TYPE_INTERRUPT:
1008 uurb->number_of_packets = 0;
1009 if ((ep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
1010 != USB_ENDPOINT_XFER_INT)
1011 return -EINVAL;
1012 if (ps->dev->speed == USB_SPEED_HIGH)
1013 interval = 1 << min (15, ep->desc.bInterval - 1);
1014 else
1015 interval = ep->desc.bInterval;
1016 if (uurb->buffer_length > MAX_USBFS_BUFFER_SIZE)
1017 return -EINVAL;
1018 if (!access_ok((uurb->endpoint & USB_DIR_IN) ? VERIFY_WRITE : VERIFY_READ, uurb->buffer, uurb->buffer_length))
1019 return -EFAULT;
1020 snoop(&ps->dev->dev, "interrupt urb\n");
1021 break;
1022
1023 default:
1024 return -EINVAL;
1025 }
1026 if (!(as = alloc_async(uurb->number_of_packets))) {
1027 kfree(isopkt);
1028 kfree(dr);
1029 return -ENOMEM;
1030 }
1031 if (!(as->urb->transfer_buffer = kmalloc(uurb->buffer_length, GFP_KERNEL))) {
1032 kfree(isopkt);
1033 kfree(dr);
1034 free_async(as);
1035 return -ENOMEM;
1036 }
1037 as->urb->dev = ps->dev;
1038 as->urb->pipe = (uurb->type << 30) | __create_pipe(ps->dev, uurb->endpoint & 0xf) | (uurb->endpoint & USB_DIR_IN);
1039 as->urb->transfer_flags = uurb->flags;
1040 as->urb->transfer_buffer_length = uurb->buffer_length;
1041 as->urb->setup_packet = (unsigned char*)dr;
1042 as->urb->start_frame = uurb->start_frame;
1043 as->urb->number_of_packets = uurb->number_of_packets;
1044 as->urb->interval = interval;
1045 as->urb->context = as;
1046 as->urb->complete = async_completed;
1047 for (totlen = u = 0; u < uurb->number_of_packets; u++) {
1048 as->urb->iso_frame_desc[u].offset = totlen;
1049 as->urb->iso_frame_desc[u].length = isopkt[u].length;
1050 totlen += isopkt[u].length;
1051 }
1052 kfree(isopkt);
1053 as->ps = ps;
1054 as->userurb = arg;
1055 if (uurb->endpoint & USB_DIR_IN)
1056 as->userbuffer = uurb->buffer;
1057 else
1058 as->userbuffer = NULL;
1059 as->signr = uurb->signr;
1060 as->ifnum = ifnum;
1061 as->pid = current->pid;
1062 as->uid = current->uid;
1063 as->euid = current->euid;
1064 security_task_getsecid(current, &as->secid);
1065 if (!(uurb->endpoint & USB_DIR_IN)) {
1066 if (copy_from_user(as->urb->transfer_buffer, uurb->buffer, as->urb->transfer_buffer_length)) {
1067 free_async(as);
1068 return -EFAULT;
1069 }
1070 }
1071 snoop(&as->urb->dev->dev, "submit urb\n");
1072 snoop_urb(as->urb, as->userurb);
1073 async_newpending(as);
1074 if ((ret = usb_submit_urb(as->urb, GFP_KERNEL))) {
1075 dev_printk(KERN_DEBUG, &ps->dev->dev, "usbfs: usb_submit_urb returned %d\n", ret);
1076 async_removepending(as);
1077 free_async(as);
1078 return ret;
1079 }
1080 return 0;
1081 }
1082
1083 static int proc_submiturb(struct dev_state *ps, void __user *arg)
1084 {
1085 struct usbdevfs_urb uurb;
1086
1087 if (copy_from_user(&uurb, arg, sizeof(uurb)))
1088 return -EFAULT;
1089
1090 return proc_do_submiturb(ps, &uurb, (((struct usbdevfs_urb __user *)arg)->iso_frame_desc), arg);
1091 }
1092
1093 static int proc_unlinkurb(struct dev_state *ps, void __user *arg)
1094 {
1095 struct async *as;
1096
1097 as = async_getpending(ps, arg);
1098 if (!as)
1099 return -EINVAL;
1100 usb_kill_urb(as->urb);
1101 return 0;
1102 }
1103
1104 static int processcompl(struct async *as, void __user * __user *arg)
1105 {
1106 struct urb *urb = as->urb;
1107 struct usbdevfs_urb __user *userurb = as->userurb;
1108 void __user *addr = as->userurb;
1109 unsigned int i;
1110
1111 if (as->userbuffer)
1112 if (copy_to_user(as->userbuffer, urb->transfer_buffer, urb->transfer_buffer_length))
1113 return -EFAULT;
1114 if (put_user(urb->status, &userurb->status))
1115 return -EFAULT;
1116 if (put_user(urb->actual_length, &userurb->actual_length))
1117 return -EFAULT;
1118 if (put_user(urb->error_count, &userurb->error_count))
1119 return -EFAULT;
1120
1121 if (usb_pipeisoc(urb->pipe)) {
1122 for (i = 0; i < urb->number_of_packets; i++) {
1123 if (put_user(urb->iso_frame_desc[i].actual_length,
1124 &userurb->iso_frame_desc[i].actual_length))
1125 return -EFAULT;
1126 if (put_user(urb->iso_frame_desc[i].status,
1127 &userurb->iso_frame_desc[i].status))
1128 return -EFAULT;
1129 }
1130 }
1131
1132 free_async(as);
1133
1134 if (put_user(addr, (void __user * __user *)arg))
1135 return -EFAULT;
1136 return 0;
1137 }
1138
1139 static struct async* reap_as(struct dev_state *ps)
1140 {
1141 DECLARE_WAITQUEUE(wait, current);
1142 struct async *as = NULL;
1143 struct usb_device *dev = ps->dev;
1144
1145 add_wait_queue(&ps->wait, &wait);
1146 for (;;) {
1147 __set_current_state(TASK_INTERRUPTIBLE);
1148 if ((as = async_getcompleted(ps)))
1149 break;
1150 if (signal_pending(current))
1151 break;
1152 usb_unlock_device(dev);
1153 schedule();
1154 usb_lock_device(dev);
1155 }
1156 remove_wait_queue(&ps->wait, &wait);
1157 set_current_state(TASK_RUNNING);
1158 return as;
1159 }
1160
1161 static int proc_reapurb(struct dev_state *ps, void __user *arg)
1162 {
1163 struct async *as = reap_as(ps);
1164 if (as)
1165 return processcompl(as, (void __user * __user *)arg);
1166 if (signal_pending(current))
1167 return -EINTR;
1168 return -EIO;
1169 }
1170
1171 static int proc_reapurbnonblock(struct dev_state *ps, void __user *arg)
1172 {
1173 struct async *as;
1174
1175 if (!(as = async_getcompleted(ps)))
1176 return -EAGAIN;
1177 return processcompl(as, (void __user * __user *)arg);
1178 }
1179
1180 #ifdef CONFIG_COMPAT
1181
1182 static int get_urb32(struct usbdevfs_urb *kurb,
1183 struct usbdevfs_urb32 __user *uurb)
1184 {
1185 __u32 uptr;
1186 if (get_user(kurb->type, &uurb->type) ||
1187 __get_user(kurb->endpoint, &uurb->endpoint) ||
1188 __get_user(kurb->status, &uurb->status) ||
1189 __get_user(kurb->flags, &uurb->flags) ||
1190 __get_user(kurb->buffer_length, &uurb->buffer_length) ||
1191 __get_user(kurb->actual_length, &uurb->actual_length) ||
1192 __get_user(kurb->start_frame, &uurb->start_frame) ||
1193 __get_user(kurb->number_of_packets, &uurb->number_of_packets) ||
1194 __get_user(kurb->error_count, &uurb->error_count) ||
1195 __get_user(kurb->signr, &uurb->signr))
1196 return -EFAULT;
1197
1198 if (__get_user(uptr, &uurb->buffer))
1199 return -EFAULT;
1200 kurb->buffer = compat_ptr(uptr);
1201 if (__get_user(uptr, &uurb->buffer))
1202 return -EFAULT;
1203 kurb->usercontext = compat_ptr(uptr);
1204
1205 return 0;
1206 }
1207
1208 static int proc_submiturb_compat(struct dev_state *ps, void __user *arg)
1209 {
1210 struct usbdevfs_urb uurb;
1211
1212 if (get_urb32(&uurb,(struct usbdevfs_urb32 *)arg))
1213 return -EFAULT;
1214
1215 return proc_do_submiturb(ps, &uurb, ((struct usbdevfs_urb32 __user *)arg)->iso_frame_desc, arg);
1216 }
1217
1218 static int processcompl_compat(struct async *as, void __user * __user *arg)
1219 {
1220 struct urb *urb = as->urb;
1221 struct usbdevfs_urb32 __user *userurb = as->userurb;
1222 void __user *addr = as->userurb;
1223 unsigned int i;
1224
1225 if (as->userbuffer)
1226 if (copy_to_user(as->userbuffer, urb->transfer_buffer, urb->transfer_buffer_length))
1227 return -EFAULT;
1228 if (put_user(urb->status, &userurb->status))
1229 return -EFAULT;
1230 if (put_user(urb->actual_length, &userurb->actual_length))
1231 return -EFAULT;
1232 if (put_user(urb->error_count, &userurb->error_count))
1233 return -EFAULT;
1234
1235 if (usb_pipeisoc(urb->pipe)) {
1236 for (i = 0; i < urb->number_of_packets; i++) {
1237 if (put_user(urb->iso_frame_desc[i].actual_length,
1238 &userurb->iso_frame_desc[i].actual_length))
1239 return -EFAULT;
1240 if (put_user(urb->iso_frame_desc[i].status,
1241 &userurb->iso_frame_desc[i].status))
1242 return -EFAULT;
1243 }
1244 }
1245
1246 free_async(as);
1247 if (put_user((u32)(u64)addr, (u32 __user *)arg))
1248 return -EFAULT;
1249 return 0;
1250 }
1251
1252 static int proc_reapurb_compat(struct dev_state *ps, void __user *arg)
1253 {
1254 struct async *as = reap_as(ps);
1255 if (as)
1256 return processcompl_compat(as, (void __user * __user *)arg);
1257 if (signal_pending(current))
1258 return -EINTR;
1259 return -EIO;
1260 }
1261
1262 static int proc_reapurbnonblock_compat(struct dev_state *ps, void __user *arg)
1263 {
1264 struct async *as;
1265
1266 if (!(as = async_getcompleted(ps)))
1267 return -EAGAIN;
1268 return processcompl_compat(as, (void __user * __user *)arg);
1269 }
1270
1271 #endif
1272
1273 static int proc_disconnectsignal(struct dev_state *ps, void __user *arg)
1274 {
1275 struct usbdevfs_disconnectsignal ds;
1276
1277 if (copy_from_user(&ds, arg, sizeof(ds)))
1278 return -EFAULT;
1279 if (ds.signr != 0 && (ds.signr < SIGRTMIN || ds.signr > SIGRTMAX))
1280 return -EINVAL;
1281 ps->discsignr = ds.signr;
1282 ps->disccontext = ds.context;
1283 return 0;
1284 }
1285
1286 static int proc_claiminterface(struct dev_state *ps, void __user *arg)
1287 {
1288 unsigned int ifnum;
1289
1290 if (get_user(ifnum, (unsigned int __user *)arg))
1291 return -EFAULT;
1292 return claimintf(ps, ifnum);
1293 }
1294
1295 static int proc_releaseinterface(struct dev_state *ps, void __user *arg)
1296 {
1297 unsigned int ifnum;
1298 int ret;
1299
1300 if (get_user(ifnum, (unsigned int __user *)arg))
1301 return -EFAULT;
1302 if ((ret = releaseintf(ps, ifnum)) < 0)
1303 return ret;
1304 destroy_async_on_interface (ps, ifnum);
1305 return 0;
1306 }
1307
1308 static int proc_ioctl(struct dev_state *ps, struct usbdevfs_ioctl *ctl)
1309 {
1310 int size;
1311 void *buf = NULL;
1312 int retval = 0;
1313 struct usb_interface *intf = NULL;
1314 struct usb_driver *driver = NULL;
1315
1316 /* alloc buffer */
1317 if ((size = _IOC_SIZE (ctl->ioctl_code)) > 0) {
1318 if ((buf = kmalloc (size, GFP_KERNEL)) == NULL)
1319 return -ENOMEM;
1320 if ((_IOC_DIR(ctl->ioctl_code) & _IOC_WRITE)) {
1321 if (copy_from_user (buf, ctl->data, size)) {
1322 kfree(buf);
1323 return -EFAULT;
1324 }
1325 } else {
1326 memset (buf, 0, size);
1327 }
1328 }
1329
1330 if (!connected(ps)) {
1331 kfree(buf);
1332 return -ENODEV;
1333 }
1334
1335 if (ps->dev->state != USB_STATE_CONFIGURED)
1336 retval = -EHOSTUNREACH;
1337 else if (!(intf = usb_ifnum_to_if (ps->dev, ctl->ifno)))
1338 retval = -EINVAL;
1339 else switch (ctl->ioctl_code) {
1340
1341 /* disconnect kernel driver from interface */
1342 case USBDEVFS_DISCONNECT:
1343
1344 down_write(&usb_bus_type.subsys.rwsem);
1345 if (intf->dev.driver) {
1346 driver = to_usb_driver(intf->dev.driver);
1347 dev_dbg (&intf->dev, "disconnect by usbfs\n");
1348 usb_driver_release_interface(driver, intf);
1349 } else
1350 retval = -ENODATA;
1351 up_write(&usb_bus_type.subsys.rwsem);
1352 break;
1353
1354 /* let kernel drivers try to (re)bind to the interface */
1355 case USBDEVFS_CONNECT:
1356 usb_unlock_device(ps->dev);
1357 bus_rescan_devices(intf->dev.bus);
1358 usb_lock_device(ps->dev);
1359 break;
1360
1361 /* talk directly to the interface's driver */
1362 default:
1363 down_read(&usb_bus_type.subsys.rwsem);
1364 if (intf->dev.driver)
1365 driver = to_usb_driver(intf->dev.driver);
1366 if (driver == NULL || driver->ioctl == NULL) {
1367 retval = -ENOTTY;
1368 } else {
1369 retval = driver->ioctl (intf, ctl->ioctl_code, buf);
1370 if (retval == -ENOIOCTLCMD)
1371 retval = -ENOTTY;
1372 }
1373 up_read(&usb_bus_type.subsys.rwsem);
1374 }
1375
1376 /* cleanup and return */
1377 if (retval >= 0
1378 && (_IOC_DIR (ctl->ioctl_code) & _IOC_READ) != 0
1379 && size > 0
1380 && copy_to_user (ctl->data, buf, size) != 0)
1381 retval = -EFAULT;
1382
1383 kfree(buf);
1384 return retval;
1385 }
1386
1387 static int proc_ioctl_default(struct dev_state *ps, void __user *arg)
1388 {
1389 struct usbdevfs_ioctl ctrl;
1390
1391 if (copy_from_user(&ctrl, arg, sizeof (ctrl)))
1392 return -EFAULT;
1393 return proc_ioctl(ps, &ctrl);
1394 }
1395
1396 #ifdef CONFIG_COMPAT
1397 static int proc_ioctl_compat(struct dev_state *ps, compat_uptr_t arg)
1398 {
1399 struct usbdevfs_ioctl32 __user *uioc;
1400 struct usbdevfs_ioctl ctrl;
1401 u32 udata;
1402
1403 uioc = compat_ptr((long)arg);
1404 if (get_user(ctrl.ifno, &uioc->ifno) ||
1405 get_user(ctrl.ioctl_code, &uioc->ioctl_code) ||
1406 __get_user(udata, &uioc->data))
1407 return -EFAULT;
1408 ctrl.data = compat_ptr(udata);
1409
1410 return proc_ioctl(ps, &ctrl);
1411 }
1412 #endif
1413
1414 /*
1415 * NOTE: All requests here that have interface numbers as parameters
1416 * are assuming that somehow the configuration has been prevented from
1417 * changing. But there's no mechanism to ensure that...
1418 */
1419 static int usbdev_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
1420 {
1421 struct dev_state *ps = (struct dev_state *)file->private_data;
1422 struct usb_device *dev = ps->dev;
1423 void __user *p = (void __user *)arg;
1424 int ret = -ENOTTY;
1425
1426 if (!(file->f_mode & FMODE_WRITE))
1427 return -EPERM;
1428 usb_lock_device(dev);
1429 if (!connected(ps)) {
1430 usb_unlock_device(dev);
1431 return -ENODEV;
1432 }
1433
1434 switch (cmd) {
1435 case USBDEVFS_CONTROL:
1436 snoop(&dev->dev, "%s: CONTROL\n", __FUNCTION__);
1437 ret = proc_control(ps, p);
1438 if (ret >= 0)
1439 inode->i_mtime = CURRENT_TIME;
1440 break;
1441
1442 case USBDEVFS_BULK:
1443 snoop(&dev->dev, "%s: BULK\n", __FUNCTION__);
1444 ret = proc_bulk(ps, p);
1445 if (ret >= 0)
1446 inode->i_mtime = CURRENT_TIME;
1447 break;
1448
1449 case USBDEVFS_RESETEP:
1450 snoop(&dev->dev, "%s: RESETEP\n", __FUNCTION__);
1451 ret = proc_resetep(ps, p);
1452 if (ret >= 0)
1453 inode->i_mtime = CURRENT_TIME;
1454 break;
1455
1456 case USBDEVFS_RESET:
1457 snoop(&dev->dev, "%s: RESET\n", __FUNCTION__);
1458 ret = proc_resetdevice(ps);
1459 break;
1460
1461 case USBDEVFS_CLEAR_HALT:
1462 snoop(&dev->dev, "%s: CLEAR_HALT\n", __FUNCTION__);
1463 ret = proc_clearhalt(ps, p);
1464 if (ret >= 0)
1465 inode->i_mtime = CURRENT_TIME;
1466 break;
1467
1468 case USBDEVFS_GETDRIVER:
1469 snoop(&dev->dev, "%s: GETDRIVER\n", __FUNCTION__);
1470 ret = proc_getdriver(ps, p);
1471 break;
1472
1473 case USBDEVFS_CONNECTINFO:
1474 snoop(&dev->dev, "%s: CONNECTINFO\n", __FUNCTION__);
1475 ret = proc_connectinfo(ps, p);
1476 break;
1477
1478 case USBDEVFS_SETINTERFACE:
1479 snoop(&dev->dev, "%s: SETINTERFACE\n", __FUNCTION__);
1480 ret = proc_setintf(ps, p);
1481 break;
1482
1483 case USBDEVFS_SETCONFIGURATION:
1484 snoop(&dev->dev, "%s: SETCONFIGURATION\n", __FUNCTION__);
1485 ret = proc_setconfig(ps, p);
1486 break;
1487
1488 case USBDEVFS_SUBMITURB:
1489 snoop(&dev->dev, "%s: SUBMITURB\n", __FUNCTION__);
1490 ret = proc_submiturb(ps, p);
1491 if (ret >= 0)
1492 inode->i_mtime = CURRENT_TIME;
1493 break;
1494
1495 #ifdef CONFIG_COMPAT
1496
1497 case USBDEVFS_SUBMITURB32:
1498 snoop(&dev->dev, "%s: SUBMITURB32\n", __FUNCTION__);
1499 ret = proc_submiturb_compat(ps, p);
1500 if (ret >= 0)
1501 inode->i_mtime = CURRENT_TIME;
1502 break;
1503
1504 case USBDEVFS_REAPURB32:
1505 snoop(&dev->dev, "%s: REAPURB32\n", __FUNCTION__);
1506 ret = proc_reapurb_compat(ps, p);
1507 break;
1508
1509 case USBDEVFS_REAPURBNDELAY32:
1510 snoop(&dev->dev, "%s: REAPURBDELAY32\n", __FUNCTION__);
1511 ret = proc_reapurbnonblock_compat(ps, p);
1512 break;
1513
1514 case USBDEVFS_IOCTL32:
1515 snoop(&dev->dev, "%s: IOCTL\n", __FUNCTION__);
1516 ret = proc_ioctl_compat(ps, (compat_uptr_t)(long)p);
1517 break;
1518 #endif
1519
1520 case USBDEVFS_DISCARDURB:
1521 snoop(&dev->dev, "%s: DISCARDURB\n", __FUNCTION__);
1522 ret = proc_unlinkurb(ps, p);
1523 break;
1524
1525 case USBDEVFS_REAPURB:
1526 snoop(&dev->dev, "%s: REAPURB\n", __FUNCTION__);
1527 ret = proc_reapurb(ps, p);
1528 break;
1529
1530 case USBDEVFS_REAPURBNDELAY:
1531 snoop(&dev->dev, "%s: REAPURBDELAY\n", __FUNCTION__);
1532 ret = proc_reapurbnonblock(ps, p);
1533 break;
1534
1535 case USBDEVFS_DISCSIGNAL:
1536 snoop(&dev->dev, "%s: DISCSIGNAL\n", __FUNCTION__);
1537 ret = proc_disconnectsignal(ps, p);
1538 break;
1539
1540 case USBDEVFS_CLAIMINTERFACE:
1541 snoop(&dev->dev, "%s: CLAIMINTERFACE\n", __FUNCTION__);
1542 ret = proc_claiminterface(ps, p);
1543 break;
1544
1545 case USBDEVFS_RELEASEINTERFACE:
1546 snoop(&dev->dev, "%s: RELEASEINTERFACE\n", __FUNCTION__);
1547 ret = proc_releaseinterface(ps, p);
1548 break;
1549
1550 case USBDEVFS_IOCTL:
1551 snoop(&dev->dev, "%s: IOCTL\n", __FUNCTION__);
1552 ret = proc_ioctl_default(ps, p);
1553 break;
1554 }
1555 usb_unlock_device(dev);
1556 if (ret >= 0)
1557 inode->i_atime = CURRENT_TIME;
1558 return ret;
1559 }
1560
1561 /* No kernel lock - fine */
1562 static unsigned int usbdev_poll(struct file *file, struct poll_table_struct *wait)
1563 {
1564 struct dev_state *ps = (struct dev_state *)file->private_data;
1565 unsigned int mask = 0;
1566
1567 poll_wait(file, &ps->wait, wait);
1568 if (file->f_mode & FMODE_WRITE && !list_empty(&ps->async_completed))
1569 mask |= POLLOUT | POLLWRNORM;
1570 if (!connected(ps))
1571 mask |= POLLERR | POLLHUP;
1572 return mask;
1573 }
1574
1575 const struct file_operations usbfs_device_file_operations = {
1576 .llseek = usbdev_lseek,
1577 .read = usbdev_read,
1578 .poll = usbdev_poll,
1579 .ioctl = usbdev_ioctl,
1580 .open = usbdev_open,
1581 .release = usbdev_release,
1582 };
1583
1584 static void usbdev_add(struct usb_device *dev)
1585 {
1586 int minor = ((dev->bus->busnum-1) * 128) + (dev->devnum-1);
1587
1588 dev->class_dev = class_device_create(usb_device_class, NULL,
1589 MKDEV(USB_DEVICE_MAJOR, minor), &dev->dev,
1590 "usbdev%d.%d", dev->bus->busnum, dev->devnum);
1591
1592 dev->class_dev->class_data = dev;
1593 }
1594
1595 static void usbdev_remove(struct usb_device *dev)
1596 {
1597 class_device_unregister(dev->class_dev);
1598 }
1599
1600 static int usbdev_notify(struct notifier_block *self, unsigned long action,
1601 void *dev)
1602 {
1603 switch (action) {
1604 case USB_DEVICE_ADD:
1605 usbdev_add(dev);
1606 break;
1607 case USB_DEVICE_REMOVE:
1608 usbdev_remove(dev);
1609 break;
1610 }
1611 return NOTIFY_OK;
1612 }
1613
1614 static struct notifier_block usbdev_nb = {
1615 .notifier_call = usbdev_notify,
1616 };
1617
1618 static struct cdev usb_device_cdev = {
1619 .kobj = {.name = "usb_device", },
1620 .owner = THIS_MODULE,
1621 };
1622
1623 int __init usbdev_init(void)
1624 {
1625 int retval;
1626
1627 retval = register_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX,
1628 "usb_device");
1629 if (retval) {
1630 err("unable to register minors for usb_device");
1631 goto out;
1632 }
1633 cdev_init(&usb_device_cdev, &usbfs_device_file_operations);
1634 retval = cdev_add(&usb_device_cdev, USB_DEVICE_DEV, USB_DEVICE_MAX);
1635 if (retval) {
1636 err("unable to get usb_device major %d", USB_DEVICE_MAJOR);
1637 goto error_cdev;
1638 }
1639 usb_device_class = class_create(THIS_MODULE, "usb_device");
1640 if (IS_ERR(usb_device_class)) {
1641 err("unable to register usb_device class");
1642 retval = PTR_ERR(usb_device_class);
1643 goto error_class;
1644 }
1645
1646 usb_register_notify(&usbdev_nb);
1647
1648 out:
1649 return retval;
1650
1651 error_class:
1652 usb_device_class = NULL;
1653 cdev_del(&usb_device_cdev);
1654
1655 error_cdev:
1656 unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
1657 goto out;
1658 }
1659
1660 void usbdev_cleanup(void)
1661 {
1662 usb_unregister_notify(&usbdev_nb);
1663 class_destroy(usb_device_class);
1664 cdev_del(&usb_device_cdev);
1665 unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
1666 }
1667
x86 "subsystem" repository