1 /*****************************************************************************/
4 * devio.c -- User space communication with USB devices.
6 * Copyright (C) 1999-2000 Thomas Sailer (sailer@ife.ee.ethz.ch)
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.
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.
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.
22 * This file implements the usbfs/x/y files, where
23 * x is the bus number and y the device number.
25 * It allows user space programs/"drivers" to communicate directly
26 * with USB devices without intervening kernel driver.
29 * 22.12.1999 0.1 Initial release (split from proc_usb.c)
30 * 04.01.2000 0.2 Turned into its own filesystem
31 * 30.09.2005 0.3 Fix user-triggerable oops in async URB delivery
35 /*****************************************************************************/
39 #include <linux/slab.h>
40 #include <linux/signal.h>
41 #include <linux/poll.h>
42 #include <linux/module.h>
43 #include <linux/string.h>
44 #include <linux/usb.h>
45 #include <linux/usbdevice_fs.h>
46 #include <linux/usb/hcd.h> /* for usbcore internals */
47 #include <linux/cdev.h>
48 #include <linux/notifier.h>
49 #include <linux/security.h>
50 #include <linux/user_namespace.h>
51 #include <linux/scatterlist.h>
52 #include <linux/uaccess.h>
53 #include <asm/byteorder.h>
54 #include <linux/moduleparam.h>
59 #define USB_DEVICE_MAX (USB_MAXBUS * 128)
60 #define USB_SG_SIZE 16384 /* split-size for large txs */
62 /* Mutual exclusion for removal, open, and release */
63 DEFINE_MUTEX(usbfs_mutex);
65 struct usb_dev_state {
66 struct list_head list; /* state list */
67 struct usb_device *dev;
69 spinlock_t lock; /* protects the async urb lists */
70 struct list_head async_pending;
71 struct list_head async_completed;
72 wait_queue_head_t wait; /* wake up if a request completed */
73 unsigned int discsignr;
75 const struct cred *cred;
76 void __user *disccontext;
77 unsigned long ifclaimed;
79 u32 disabled_bulk_eps;
83 struct list_head asynclist;
84 struct usb_dev_state *ps;
86 const struct cred *cred;
89 void __user *userbuffer;
92 unsigned int mem_usage;
99 static bool usbfs_snoop;
100 module_param(usbfs_snoop, bool, S_IRUGO | S_IWUSR);
101 MODULE_PARM_DESC(usbfs_snoop, "true to log all usbfs traffic");
103 static unsigned usbfs_snoop_max = 65536;
104 module_param(usbfs_snoop_max, uint, S_IRUGO | S_IWUSR);
105 MODULE_PARM_DESC(usbfs_snoop_max,
106 "maximum number of bytes to print while snooping");
108 #define snoop(dev, format, arg...) \
111 dev_info(dev, format, ## arg); \
118 #define USB_DEVICE_DEV MKDEV(USB_DEVICE_MAJOR, 0)
120 /* Limit on the total amount of memory we can allocate for transfers */
121 static unsigned usbfs_memory_mb = 16;
122 module_param(usbfs_memory_mb, uint, 0644);
123 MODULE_PARM_DESC(usbfs_memory_mb,
124 "maximum MB allowed for usbfs buffers (0 = no limit)");
126 /* Hard limit, necessary to avoid arithmetic overflow */
127 #define USBFS_XFER_MAX (UINT_MAX / 2 - 1000000)
129 static atomic_t usbfs_memory_usage; /* Total memory currently allocated */
131 /* Check whether it's okay to allocate more memory for a transfer */
132 static int usbfs_increase_memory_usage(unsigned amount)
137 * Convert usbfs_memory_mb to bytes, avoiding overflows.
138 * 0 means use the hard limit (effectively unlimited).
140 lim = ACCESS_ONCE(usbfs_memory_mb);
141 if (lim == 0 || lim > (USBFS_XFER_MAX >> 20))
142 lim = USBFS_XFER_MAX;
146 atomic_add(amount, &usbfs_memory_usage);
147 if (atomic_read(&usbfs_memory_usage) <= lim)
149 atomic_sub(amount, &usbfs_memory_usage);
153 /* Memory for a transfer is being deallocated */
154 static void usbfs_decrease_memory_usage(unsigned amount)
156 atomic_sub(amount, &usbfs_memory_usage);
159 static int connected(struct usb_dev_state *ps)
161 return (!list_empty(&ps->list) &&
162 ps->dev->state != USB_STATE_NOTATTACHED);
165 static ssize_t usbdev_read(struct file *file, char __user *buf, size_t nbytes,
168 struct usb_dev_state *ps = file->private_data;
169 struct usb_device *dev = ps->dev;
176 usb_lock_device(dev);
177 if (!connected(ps)) {
180 } else if (pos < 0) {
185 if (pos < sizeof(struct usb_device_descriptor)) {
186 /* 18 bytes - fits on the stack */
187 struct usb_device_descriptor temp_desc;
189 memcpy(&temp_desc, &dev->descriptor, sizeof(dev->descriptor));
190 le16_to_cpus(&temp_desc.bcdUSB);
191 le16_to_cpus(&temp_desc.idVendor);
192 le16_to_cpus(&temp_desc.idProduct);
193 le16_to_cpus(&temp_desc.bcdDevice);
195 len = sizeof(struct usb_device_descriptor) - pos;
198 if (copy_to_user(buf, ((char *)&temp_desc) + pos, len)) {
209 pos = sizeof(struct usb_device_descriptor);
210 for (i = 0; nbytes && i < dev->descriptor.bNumConfigurations; i++) {
211 struct usb_config_descriptor *config =
212 (struct usb_config_descriptor *)dev->rawdescriptors[i];
213 unsigned int length = le16_to_cpu(config->wTotalLength);
215 if (*ppos < pos + length) {
217 /* The descriptor may claim to be longer than it
218 * really is. Here is the actual allocated length. */
220 le16_to_cpu(dev->config[i].desc.wTotalLength);
222 len = length - (*ppos - pos);
226 /* Simply don't write (skip over) unallocated parts */
227 if (alloclen > (*ppos - pos)) {
228 alloclen -= (*ppos - pos);
229 if (copy_to_user(buf,
230 dev->rawdescriptors[i] + (*ppos - pos),
231 min(len, alloclen))) {
247 usb_unlock_device(dev);
252 * async list handling
255 static struct async *alloc_async(unsigned int numisoframes)
259 as = kzalloc(sizeof(struct async), GFP_KERNEL);
262 as->urb = usb_alloc_urb(numisoframes, GFP_KERNEL);
270 static void free_async(struct async *as)
277 for (i = 0; i < as->urb->num_sgs; i++) {
278 if (sg_page(&as->urb->sg[i]))
279 kfree(sg_virt(&as->urb->sg[i]));
282 kfree(as->urb->transfer_buffer);
283 kfree(as->urb->setup_packet);
284 usb_free_urb(as->urb);
285 usbfs_decrease_memory_usage(as->mem_usage);
289 static void async_newpending(struct async *as)
291 struct usb_dev_state *ps = as->ps;
294 spin_lock_irqsave(&ps->lock, flags);
295 list_add_tail(&as->asynclist, &ps->async_pending);
296 spin_unlock_irqrestore(&ps->lock, flags);
299 static void async_removepending(struct async *as)
301 struct usb_dev_state *ps = as->ps;
304 spin_lock_irqsave(&ps->lock, flags);
305 list_del_init(&as->asynclist);
306 spin_unlock_irqrestore(&ps->lock, flags);
309 static struct async *async_getcompleted(struct usb_dev_state *ps)
312 struct async *as = NULL;
314 spin_lock_irqsave(&ps->lock, flags);
315 if (!list_empty(&ps->async_completed)) {
316 as = list_entry(ps->async_completed.next, struct async,
318 list_del_init(&as->asynclist);
320 spin_unlock_irqrestore(&ps->lock, flags);
324 static struct async *async_getpending(struct usb_dev_state *ps,
325 void __user *userurb)
329 list_for_each_entry(as, &ps->async_pending, asynclist)
330 if (as->userurb == userurb) {
331 list_del_init(&as->asynclist);
338 static void snoop_urb(struct usb_device *udev,
339 void __user *userurb, int pipe, unsigned length,
340 int timeout_or_status, enum snoop_when when,
341 unsigned char *data, unsigned data_len)
343 static const char *types[] = {"isoc", "int", "ctrl", "bulk"};
344 static const char *dirs[] = {"out", "in"};
351 ep = usb_pipeendpoint(pipe);
352 t = types[usb_pipetype(pipe)];
353 d = dirs[!!usb_pipein(pipe)];
355 if (userurb) { /* Async */
357 dev_info(&udev->dev, "userurb %p, ep%d %s-%s, "
359 userurb, ep, t, d, length);
361 dev_info(&udev->dev, "userurb %p, ep%d %s-%s, "
362 "actual_length %u status %d\n",
363 userurb, ep, t, d, length,
367 dev_info(&udev->dev, "ep%d %s-%s, length %u, "
369 ep, t, d, length, timeout_or_status);
371 dev_info(&udev->dev, "ep%d %s-%s, actual_length %u, "
373 ep, t, d, length, timeout_or_status);
376 data_len = min(data_len, usbfs_snoop_max);
377 if (data && data_len > 0) {
378 print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1,
383 static void snoop_urb_data(struct urb *urb, unsigned len)
387 len = min(len, usbfs_snoop_max);
388 if (!usbfs_snoop || len == 0)
391 if (urb->num_sgs == 0) {
392 print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1,
393 urb->transfer_buffer, len, 1);
397 for (i = 0; i < urb->num_sgs && len; i++) {
398 size = (len > USB_SG_SIZE) ? USB_SG_SIZE : len;
399 print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1,
400 sg_virt(&urb->sg[i]), size, 1);
405 static int copy_urb_data_to_user(u8 __user *userbuffer, struct urb *urb)
407 unsigned i, len, size;
409 if (urb->number_of_packets > 0) /* Isochronous */
410 len = urb->transfer_buffer_length;
412 len = urb->actual_length;
414 if (urb->num_sgs == 0) {
415 if (copy_to_user(userbuffer, urb->transfer_buffer, len))
420 for (i = 0; i < urb->num_sgs && len; i++) {
421 size = (len > USB_SG_SIZE) ? USB_SG_SIZE : len;
422 if (copy_to_user(userbuffer, sg_virt(&urb->sg[i]), size))
431 #define AS_CONTINUATION 1
434 static void cancel_bulk_urbs(struct usb_dev_state *ps, unsigned bulk_addr)
441 /* Mark all the pending URBs that match bulk_addr, up to but not
442 * including the first one without AS_CONTINUATION. If such an
443 * URB is encountered then a new transfer has already started so
444 * the endpoint doesn't need to be disabled; otherwise it does.
446 list_for_each_entry(as, &ps->async_pending, asynclist) {
447 if (as->bulk_addr == bulk_addr) {
448 if (as->bulk_status != AS_CONTINUATION)
450 as->bulk_status = AS_UNLINK;
454 ps->disabled_bulk_eps |= (1 << bulk_addr);
456 /* Now carefully unlink all the marked pending URBs */
458 list_for_each_entry(as, &ps->async_pending, asynclist) {
459 if (as->bulk_status == AS_UNLINK) {
460 as->bulk_status = 0; /* Only once */
463 spin_unlock(&ps->lock); /* Allow completions */
466 spin_lock(&ps->lock);
472 static void async_completed(struct urb *urb)
474 struct async *as = urb->context;
475 struct usb_dev_state *ps = as->ps;
476 struct siginfo sinfo;
477 struct pid *pid = NULL;
479 const struct cred *cred = NULL;
482 spin_lock(&ps->lock);
483 list_move_tail(&as->asynclist, &ps->async_completed);
484 as->status = urb->status;
487 memset(&sinfo, 0, sizeof(sinfo));
488 sinfo.si_signo = as->signr;
489 sinfo.si_errno = as->status;
490 sinfo.si_code = SI_ASYNCIO;
491 sinfo.si_addr = as->userurb;
492 pid = get_pid(as->pid);
493 cred = get_cred(as->cred);
496 snoop(&urb->dev->dev, "urb complete\n");
497 snoop_urb(urb->dev, as->userurb, urb->pipe, urb->actual_length,
498 as->status, COMPLETE, NULL, 0);
499 if ((urb->transfer_flags & URB_DIR_MASK) == URB_DIR_IN)
500 snoop_urb_data(urb, urb->actual_length);
502 if (as->status < 0 && as->bulk_addr && as->status != -ECONNRESET &&
503 as->status != -ENOENT)
504 cancel_bulk_urbs(ps, as->bulk_addr);
505 spin_unlock(&ps->lock);
508 kill_pid_info_as_cred(sinfo.si_signo, &sinfo, pid, cred, secid);
516 static void destroy_async(struct usb_dev_state *ps, struct list_head *list)
522 spin_lock_irqsave(&ps->lock, flags);
523 while (!list_empty(list)) {
524 as = list_entry(list->next, struct async, asynclist);
525 list_del_init(&as->asynclist);
529 /* drop the spinlock so the completion handler can run */
530 spin_unlock_irqrestore(&ps->lock, flags);
533 spin_lock_irqsave(&ps->lock, flags);
535 spin_unlock_irqrestore(&ps->lock, flags);
538 static void destroy_async_on_interface(struct usb_dev_state *ps,
541 struct list_head *p, *q, hitlist;
544 INIT_LIST_HEAD(&hitlist);
545 spin_lock_irqsave(&ps->lock, flags);
546 list_for_each_safe(p, q, &ps->async_pending)
547 if (ifnum == list_entry(p, struct async, asynclist)->ifnum)
548 list_move_tail(p, &hitlist);
549 spin_unlock_irqrestore(&ps->lock, flags);
550 destroy_async(ps, &hitlist);
553 static void destroy_all_async(struct usb_dev_state *ps)
555 destroy_async(ps, &ps->async_pending);
559 * interface claims are made only at the request of user level code,
560 * which can also release them (explicitly or by closing files).
561 * they're also undone when devices disconnect.
564 static int driver_probe(struct usb_interface *intf,
565 const struct usb_device_id *id)
570 static void driver_disconnect(struct usb_interface *intf)
572 struct usb_dev_state *ps = usb_get_intfdata(intf);
573 unsigned int ifnum = intf->altsetting->desc.bInterfaceNumber;
578 /* NOTE: this relies on usbcore having canceled and completed
579 * all pending I/O requests; 2.6 does that.
582 if (likely(ifnum < 8*sizeof(ps->ifclaimed)))
583 clear_bit(ifnum, &ps->ifclaimed);
585 dev_warn(&intf->dev, "interface number %u out of range\n",
588 usb_set_intfdata(intf, NULL);
590 /* force async requests to complete */
591 destroy_async_on_interface(ps, ifnum);
594 /* The following routines are merely placeholders. There is no way
595 * to inform a user task about suspend or resumes.
597 static int driver_suspend(struct usb_interface *intf, pm_message_t msg)
602 static int driver_resume(struct usb_interface *intf)
607 struct usb_driver usbfs_driver = {
609 .probe = driver_probe,
610 .disconnect = driver_disconnect,
611 .suspend = driver_suspend,
612 .resume = driver_resume,
615 static int claimintf(struct usb_dev_state *ps, unsigned int ifnum)
617 struct usb_device *dev = ps->dev;
618 struct usb_interface *intf;
621 if (ifnum >= 8*sizeof(ps->ifclaimed))
623 /* already claimed */
624 if (test_bit(ifnum, &ps->ifclaimed))
627 intf = usb_ifnum_to_if(dev, ifnum);
631 err = usb_driver_claim_interface(&usbfs_driver, intf, ps);
633 set_bit(ifnum, &ps->ifclaimed);
637 static int releaseintf(struct usb_dev_state *ps, unsigned int ifnum)
639 struct usb_device *dev;
640 struct usb_interface *intf;
644 if (ifnum >= 8*sizeof(ps->ifclaimed))
647 intf = usb_ifnum_to_if(dev, ifnum);
650 else if (test_and_clear_bit(ifnum, &ps->ifclaimed)) {
651 usb_driver_release_interface(&usbfs_driver, intf);
657 static int checkintf(struct usb_dev_state *ps, unsigned int ifnum)
659 if (ps->dev->state != USB_STATE_CONFIGURED)
660 return -EHOSTUNREACH;
661 if (ifnum >= 8*sizeof(ps->ifclaimed))
663 if (test_bit(ifnum, &ps->ifclaimed))
665 /* if not yet claimed, claim it for the driver */
666 dev_warn(&ps->dev->dev, "usbfs: process %d (%s) did not claim "
667 "interface %u before use\n", task_pid_nr(current),
668 current->comm, ifnum);
669 return claimintf(ps, ifnum);
672 static int findintfep(struct usb_device *dev, unsigned int ep)
674 unsigned int i, j, e;
675 struct usb_interface *intf;
676 struct usb_host_interface *alts;
677 struct usb_endpoint_descriptor *endpt;
679 if (ep & ~(USB_DIR_IN|0xf))
683 for (i = 0; i < dev->actconfig->desc.bNumInterfaces; i++) {
684 intf = dev->actconfig->interface[i];
685 for (j = 0; j < intf->num_altsetting; j++) {
686 alts = &intf->altsetting[j];
687 for (e = 0; e < alts->desc.bNumEndpoints; e++) {
688 endpt = &alts->endpoint[e].desc;
689 if (endpt->bEndpointAddress == ep)
690 return alts->desc.bInterfaceNumber;
697 static int check_ctrlrecip(struct usb_dev_state *ps, unsigned int requesttype,
698 unsigned int request, unsigned int index)
701 struct usb_host_interface *alt_setting;
703 if (ps->dev->state != USB_STATE_UNAUTHENTICATED
704 && ps->dev->state != USB_STATE_ADDRESS
705 && ps->dev->state != USB_STATE_CONFIGURED)
706 return -EHOSTUNREACH;
707 if (USB_TYPE_VENDOR == (USB_TYPE_MASK & requesttype))
711 * check for the special corner case 'get_device_id' in the printer
712 * class specification, which we always want to allow as it is used
713 * to query things like ink level, etc.
715 if (requesttype == 0xa1 && request == 0) {
716 alt_setting = usb_find_alt_setting(ps->dev->actconfig,
717 index >> 8, index & 0xff);
719 && alt_setting->desc.bInterfaceClass == USB_CLASS_PRINTER)
724 switch (requesttype & USB_RECIP_MASK) {
725 case USB_RECIP_ENDPOINT:
726 if ((index & ~USB_DIR_IN) == 0)
728 ret = findintfep(ps->dev, index);
731 * Some not fully compliant Win apps seem to get
732 * index wrong and have the endpoint number here
733 * rather than the endpoint address (with the
734 * correct direction). Win does let this through,
735 * so we'll not reject it here but leave it to
736 * the device to not break KVM. But we warn.
738 ret = findintfep(ps->dev, index ^ 0x80);
740 dev_info(&ps->dev->dev,
741 "%s: process %i (%s) requesting ep %02x but needs %02x\n",
742 __func__, task_pid_nr(current),
743 current->comm, index, index ^ 0x80);
746 ret = checkintf(ps, ret);
749 case USB_RECIP_INTERFACE:
750 ret = checkintf(ps, index);
756 static struct usb_host_endpoint *ep_to_host_endpoint(struct usb_device *dev,
759 if (ep & USB_ENDPOINT_DIR_MASK)
760 return dev->ep_in[ep & USB_ENDPOINT_NUMBER_MASK];
762 return dev->ep_out[ep & USB_ENDPOINT_NUMBER_MASK];
765 static int parse_usbdevfs_streams(struct usb_dev_state *ps,
766 struct usbdevfs_streams __user *streams,
767 unsigned int *num_streams_ret,
768 unsigned int *num_eps_ret,
769 struct usb_host_endpoint ***eps_ret,
770 struct usb_interface **intf_ret)
772 unsigned int i, num_streams, num_eps;
773 struct usb_host_endpoint **eps;
774 struct usb_interface *intf = NULL;
778 if (get_user(num_streams, &streams->num_streams) ||
779 get_user(num_eps, &streams->num_eps))
782 if (num_eps < 1 || num_eps > USB_MAXENDPOINTS)
785 /* The XHCI controller allows max 2 ^ 16 streams */
786 if (num_streams_ret && (num_streams < 2 || num_streams > 65536))
789 eps = kmalloc(num_eps * sizeof(*eps), GFP_KERNEL);
793 for (i = 0; i < num_eps; i++) {
794 if (get_user(ep, &streams->eps[i])) {
798 eps[i] = ep_to_host_endpoint(ps->dev, ep);
804 /* usb_alloc/free_streams operate on an usb_interface */
805 ifnum = findintfep(ps->dev, ep);
812 ret = checkintf(ps, ifnum);
815 intf = usb_ifnum_to_if(ps->dev, ifnum);
817 /* Verify all eps belong to the same interface */
818 if (ifnum != intf->altsetting->desc.bInterfaceNumber) {
826 *num_streams_ret = num_streams;
827 *num_eps_ret = num_eps;
838 static int match_devt(struct device *dev, void *data)
840 return dev->devt == (dev_t) (unsigned long) data;
843 static struct usb_device *usbdev_lookup_by_devt(dev_t devt)
847 dev = bus_find_device(&usb_bus_type, NULL,
848 (void *) (unsigned long) devt, match_devt);
851 return container_of(dev, struct usb_device, dev);
857 static int usbdev_open(struct inode *inode, struct file *file)
859 struct usb_device *dev = NULL;
860 struct usb_dev_state *ps;
864 ps = kmalloc(sizeof(struct usb_dev_state), GFP_KERNEL);
870 /* Protect against simultaneous removal or release */
871 mutex_lock(&usbfs_mutex);
873 /* usbdev device-node */
874 if (imajor(inode) == USB_DEVICE_MAJOR)
875 dev = usbdev_lookup_by_devt(inode->i_rdev);
877 mutex_unlock(&usbfs_mutex);
882 usb_lock_device(dev);
883 if (dev->state == USB_STATE_NOTATTACHED)
884 goto out_unlock_device;
886 ret = usb_autoresume_device(dev);
888 goto out_unlock_device;
892 spin_lock_init(&ps->lock);
893 INIT_LIST_HEAD(&ps->list);
894 INIT_LIST_HEAD(&ps->async_pending);
895 INIT_LIST_HEAD(&ps->async_completed);
896 init_waitqueue_head(&ps->wait);
898 ps->disc_pid = get_pid(task_pid(current));
899 ps->cred = get_current_cred();
900 ps->disccontext = NULL;
902 security_task_getsecid(current, &ps->secid);
904 list_add_tail(&ps->list, &dev->filelist);
905 file->private_data = ps;
906 usb_unlock_device(dev);
907 snoop(&dev->dev, "opened by process %d: %s\n", task_pid_nr(current),
912 usb_unlock_device(dev);
919 static int usbdev_release(struct inode *inode, struct file *file)
921 struct usb_dev_state *ps = file->private_data;
922 struct usb_device *dev = ps->dev;
926 usb_lock_device(dev);
927 usb_hub_release_all_ports(dev, ps);
929 list_del_init(&ps->list);
931 for (ifnum = 0; ps->ifclaimed && ifnum < 8*sizeof(ps->ifclaimed);
933 if (test_bit(ifnum, &ps->ifclaimed))
934 releaseintf(ps, ifnum);
936 destroy_all_async(ps);
937 usb_autosuspend_device(dev);
938 usb_unlock_device(dev);
940 put_pid(ps->disc_pid);
943 as = async_getcompleted(ps);
946 as = async_getcompleted(ps);
952 static int proc_control(struct usb_dev_state *ps, void __user *arg)
954 struct usb_device *dev = ps->dev;
955 struct usbdevfs_ctrltransfer ctrl;
961 if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
963 ret = check_ctrlrecip(ps, ctrl.bRequestType, ctrl.bRequest,
967 wLength = ctrl.wLength; /* To suppress 64k PAGE_SIZE warning */
968 if (wLength > PAGE_SIZE)
970 ret = usbfs_increase_memory_usage(PAGE_SIZE + sizeof(struct urb) +
971 sizeof(struct usb_ctrlrequest));
974 tbuf = (unsigned char *)__get_free_page(GFP_KERNEL);
980 snoop(&dev->dev, "control urb: bRequestType=%02x "
981 "bRequest=%02x wValue=%04x "
982 "wIndex=%04x wLength=%04x\n",
983 ctrl.bRequestType, ctrl.bRequest, ctrl.wValue,
984 ctrl.wIndex, ctrl.wLength);
985 if (ctrl.bRequestType & 0x80) {
986 if (ctrl.wLength && !access_ok(VERIFY_WRITE, ctrl.data,
991 pipe = usb_rcvctrlpipe(dev, 0);
992 snoop_urb(dev, NULL, pipe, ctrl.wLength, tmo, SUBMIT, NULL, 0);
994 usb_unlock_device(dev);
995 i = usb_control_msg(dev, pipe, ctrl.bRequest,
996 ctrl.bRequestType, ctrl.wValue, ctrl.wIndex,
997 tbuf, ctrl.wLength, tmo);
998 usb_lock_device(dev);
999 snoop_urb(dev, NULL, pipe, max(i, 0), min(i, 0), COMPLETE,
1001 if ((i > 0) && ctrl.wLength) {
1002 if (copy_to_user(ctrl.data, tbuf, i)) {
1009 if (copy_from_user(tbuf, ctrl.data, ctrl.wLength)) {
1014 pipe = usb_sndctrlpipe(dev, 0);
1015 snoop_urb(dev, NULL, pipe, ctrl.wLength, tmo, SUBMIT,
1016 tbuf, ctrl.wLength);
1018 usb_unlock_device(dev);
1019 i = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), ctrl.bRequest,
1020 ctrl.bRequestType, ctrl.wValue, ctrl.wIndex,
1021 tbuf, ctrl.wLength, tmo);
1022 usb_lock_device(dev);
1023 snoop_urb(dev, NULL, pipe, max(i, 0), min(i, 0), COMPLETE, NULL, 0);
1025 if (i < 0 && i != -EPIPE) {
1026 dev_printk(KERN_DEBUG, &dev->dev, "usbfs: USBDEVFS_CONTROL "
1027 "failed cmd %s rqt %u rq %u len %u ret %d\n",
1028 current->comm, ctrl.bRequestType, ctrl.bRequest,
1033 free_page((unsigned long) tbuf);
1034 usbfs_decrease_memory_usage(PAGE_SIZE + sizeof(struct urb) +
1035 sizeof(struct usb_ctrlrequest));
1039 static int proc_bulk(struct usb_dev_state *ps, void __user *arg)
1041 struct usb_device *dev = ps->dev;
1042 struct usbdevfs_bulktransfer bulk;
1043 unsigned int tmo, len1, pipe;
1045 unsigned char *tbuf;
1048 if (copy_from_user(&bulk, arg, sizeof(bulk)))
1050 ret = findintfep(ps->dev, bulk.ep);
1053 ret = checkintf(ps, ret);
1056 if (bulk.ep & USB_DIR_IN)
1057 pipe = usb_rcvbulkpipe(dev, bulk.ep & 0x7f);
1059 pipe = usb_sndbulkpipe(dev, bulk.ep & 0x7f);
1060 if (!usb_maxpacket(dev, pipe, !(bulk.ep & USB_DIR_IN)))
1063 if (len1 >= USBFS_XFER_MAX)
1065 ret = usbfs_increase_memory_usage(len1 + sizeof(struct urb));
1068 tbuf = kmalloc(len1, GFP_KERNEL);
1074 if (bulk.ep & 0x80) {
1075 if (len1 && !access_ok(VERIFY_WRITE, bulk.data, len1)) {
1079 snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT, NULL, 0);
1081 usb_unlock_device(dev);
1082 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
1083 usb_lock_device(dev);
1084 snoop_urb(dev, NULL, pipe, len2, i, COMPLETE, tbuf, len2);
1087 if (copy_to_user(bulk.data, tbuf, len2)) {
1094 if (copy_from_user(tbuf, bulk.data, len1)) {
1099 snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT, tbuf, len1);
1101 usb_unlock_device(dev);
1102 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
1103 usb_lock_device(dev);
1104 snoop_urb(dev, NULL, pipe, len2, i, COMPLETE, NULL, 0);
1106 ret = (i < 0 ? i : len2);
1109 usbfs_decrease_memory_usage(len1 + sizeof(struct urb));
1113 static void check_reset_of_active_ep(struct usb_device *udev,
1114 unsigned int epnum, char *ioctl_name)
1116 struct usb_host_endpoint **eps;
1117 struct usb_host_endpoint *ep;
1119 eps = (epnum & USB_DIR_IN) ? udev->ep_in : udev->ep_out;
1120 ep = eps[epnum & 0x0f];
1121 if (ep && !list_empty(&ep->urb_list))
1122 dev_warn(&udev->dev, "Process %d (%s) called USBDEVFS_%s for active endpoint 0x%02x\n",
1123 task_pid_nr(current), current->comm,
1127 static int proc_resetep(struct usb_dev_state *ps, void __user *arg)
1132 if (get_user(ep, (unsigned int __user *)arg))
1134 ret = findintfep(ps->dev, ep);
1137 ret = checkintf(ps, ret);
1140 check_reset_of_active_ep(ps->dev, ep, "RESETEP");
1141 usb_reset_endpoint(ps->dev, ep);
1145 static int proc_clearhalt(struct usb_dev_state *ps, void __user *arg)
1151 if (get_user(ep, (unsigned int __user *)arg))
1153 ret = findintfep(ps->dev, ep);
1156 ret = checkintf(ps, ret);
1159 check_reset_of_active_ep(ps->dev, ep, "CLEAR_HALT");
1160 if (ep & USB_DIR_IN)
1161 pipe = usb_rcvbulkpipe(ps->dev, ep & 0x7f);
1163 pipe = usb_sndbulkpipe(ps->dev, ep & 0x7f);
1165 return usb_clear_halt(ps->dev, pipe);
1168 static int proc_getdriver(struct usb_dev_state *ps, void __user *arg)
1170 struct usbdevfs_getdriver gd;
1171 struct usb_interface *intf;
1174 if (copy_from_user(&gd, arg, sizeof(gd)))
1176 intf = usb_ifnum_to_if(ps->dev, gd.interface);
1177 if (!intf || !intf->dev.driver)
1180 strlcpy(gd.driver, intf->dev.driver->name,
1182 ret = (copy_to_user(arg, &gd, sizeof(gd)) ? -EFAULT : 0);
1187 static int proc_connectinfo(struct usb_dev_state *ps, void __user *arg)
1189 struct usbdevfs_connectinfo ci = {
1190 .devnum = ps->dev->devnum,
1191 .slow = ps->dev->speed == USB_SPEED_LOW
1194 if (copy_to_user(arg, &ci, sizeof(ci)))
1199 static int proc_resetdevice(struct usb_dev_state *ps)
1201 return usb_reset_device(ps->dev);
1204 static int proc_setintf(struct usb_dev_state *ps, void __user *arg)
1206 struct usbdevfs_setinterface setintf;
1209 if (copy_from_user(&setintf, arg, sizeof(setintf)))
1211 ret = checkintf(ps, setintf.interface);
1215 destroy_async_on_interface(ps, setintf.interface);
1217 return usb_set_interface(ps->dev, setintf.interface,
1218 setintf.altsetting);
1221 static int proc_setconfig(struct usb_dev_state *ps, void __user *arg)
1225 struct usb_host_config *actconfig;
1227 if (get_user(u, (int __user *)arg))
1230 actconfig = ps->dev->actconfig;
1232 /* Don't touch the device if any interfaces are claimed.
1233 * It could interfere with other drivers' operations, and if
1234 * an interface is claimed by usbfs it could easily deadlock.
1239 for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) {
1240 if (usb_interface_claimed(actconfig->interface[i])) {
1241 dev_warn(&ps->dev->dev,
1242 "usbfs: interface %d claimed by %s "
1243 "while '%s' sets config #%d\n",
1244 actconfig->interface[i]
1246 ->desc.bInterfaceNumber,
1247 actconfig->interface[i]
1256 /* SET_CONFIGURATION is often abused as a "cheap" driver reset,
1257 * so avoid usb_set_configuration()'s kick to sysfs
1260 if (actconfig && actconfig->desc.bConfigurationValue == u)
1261 status = usb_reset_configuration(ps->dev);
1263 status = usb_set_configuration(ps->dev, u);
1269 static int proc_do_submiturb(struct usb_dev_state *ps, struct usbdevfs_urb *uurb,
1270 struct usbdevfs_iso_packet_desc __user *iso_frame_desc,
1273 struct usbdevfs_iso_packet_desc *isopkt = NULL;
1274 struct usb_host_endpoint *ep;
1275 struct async *as = NULL;
1276 struct usb_ctrlrequest *dr = NULL;
1277 unsigned int u, totlen, isofrmlen;
1278 int i, ret, is_in, num_sgs = 0, ifnum = -1;
1279 int number_of_packets = 0;
1280 unsigned int stream_id = 0;
1283 if (uurb->flags & ~(USBDEVFS_URB_ISO_ASAP |
1284 USBDEVFS_URB_SHORT_NOT_OK |
1285 USBDEVFS_URB_BULK_CONTINUATION |
1286 USBDEVFS_URB_NO_FSBR |
1287 USBDEVFS_URB_ZERO_PACKET |
1288 USBDEVFS_URB_NO_INTERRUPT))
1290 if (uurb->buffer_length > 0 && !uurb->buffer)
1292 if (!(uurb->type == USBDEVFS_URB_TYPE_CONTROL &&
1293 (uurb->endpoint & ~USB_ENDPOINT_DIR_MASK) == 0)) {
1294 ifnum = findintfep(ps->dev, uurb->endpoint);
1297 ret = checkintf(ps, ifnum);
1301 ep = ep_to_host_endpoint(ps->dev, uurb->endpoint);
1304 is_in = (uurb->endpoint & USB_ENDPOINT_DIR_MASK) != 0;
1307 switch (uurb->type) {
1308 case USBDEVFS_URB_TYPE_CONTROL:
1309 if (!usb_endpoint_xfer_control(&ep->desc))
1311 /* min 8 byte setup packet */
1312 if (uurb->buffer_length < 8)
1314 dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL);
1317 if (copy_from_user(dr, uurb->buffer, 8)) {
1321 if (uurb->buffer_length < (le16_to_cpup(&dr->wLength) + 8)) {
1325 ret = check_ctrlrecip(ps, dr->bRequestType, dr->bRequest,
1326 le16_to_cpup(&dr->wIndex));
1329 uurb->buffer_length = le16_to_cpup(&dr->wLength);
1331 if ((dr->bRequestType & USB_DIR_IN) && uurb->buffer_length) {
1333 uurb->endpoint |= USB_DIR_IN;
1336 uurb->endpoint &= ~USB_DIR_IN;
1338 snoop(&ps->dev->dev, "control urb: bRequestType=%02x "
1339 "bRequest=%02x wValue=%04x "
1340 "wIndex=%04x wLength=%04x\n",
1341 dr->bRequestType, dr->bRequest,
1342 __le16_to_cpup(&dr->wValue),
1343 __le16_to_cpup(&dr->wIndex),
1344 __le16_to_cpup(&dr->wLength));
1345 u = sizeof(struct usb_ctrlrequest);
1348 case USBDEVFS_URB_TYPE_BULK:
1349 switch (usb_endpoint_type(&ep->desc)) {
1350 case USB_ENDPOINT_XFER_CONTROL:
1351 case USB_ENDPOINT_XFER_ISOC:
1353 case USB_ENDPOINT_XFER_INT:
1354 /* allow single-shot interrupt transfers */
1355 uurb->type = USBDEVFS_URB_TYPE_INTERRUPT;
1358 num_sgs = DIV_ROUND_UP(uurb->buffer_length, USB_SG_SIZE);
1359 if (num_sgs == 1 || num_sgs > ps->dev->bus->sg_tablesize)
1362 stream_id = uurb->stream_id;
1365 case USBDEVFS_URB_TYPE_INTERRUPT:
1366 if (!usb_endpoint_xfer_int(&ep->desc))
1371 case USBDEVFS_URB_TYPE_ISO:
1372 /* arbitrary limit */
1373 if (uurb->number_of_packets < 1 ||
1374 uurb->number_of_packets > 128)
1376 if (!usb_endpoint_xfer_isoc(&ep->desc))
1378 number_of_packets = uurb->number_of_packets;
1379 isofrmlen = sizeof(struct usbdevfs_iso_packet_desc) *
1381 isopkt = kmalloc(isofrmlen, GFP_KERNEL);
1384 if (copy_from_user(isopkt, iso_frame_desc, isofrmlen)) {
1388 for (totlen = u = 0; u < number_of_packets; u++) {
1390 * arbitrary limit need for USB 3.0
1391 * bMaxBurst (0~15 allowed, 1~16 packets)
1392 * bmAttributes (bit 1:0, mult 0~2, 1~3 packets)
1393 * sizemax: 1024 * 16 * 3 = 49152
1395 if (isopkt[u].length > 49152) {
1399 totlen += isopkt[u].length;
1401 u *= sizeof(struct usb_iso_packet_descriptor);
1402 uurb->buffer_length = totlen;
1409 if (uurb->buffer_length >= USBFS_XFER_MAX) {
1413 if (uurb->buffer_length > 0 &&
1414 !access_ok(is_in ? VERIFY_WRITE : VERIFY_READ,
1415 uurb->buffer, uurb->buffer_length)) {
1419 as = alloc_async(number_of_packets);
1425 u += sizeof(struct async) + sizeof(struct urb) + uurb->buffer_length +
1426 num_sgs * sizeof(struct scatterlist);
1427 ret = usbfs_increase_memory_usage(u);
1433 as->urb->sg = kmalloc(num_sgs * sizeof(struct scatterlist),
1439 as->urb->num_sgs = num_sgs;
1440 sg_init_table(as->urb->sg, as->urb->num_sgs);
1442 totlen = uurb->buffer_length;
1443 for (i = 0; i < as->urb->num_sgs; i++) {
1444 u = (totlen > USB_SG_SIZE) ? USB_SG_SIZE : totlen;
1445 buf = kmalloc(u, GFP_KERNEL);
1450 sg_set_buf(&as->urb->sg[i], buf, u);
1453 if (copy_from_user(buf, uurb->buffer, u)) {
1461 } else if (uurb->buffer_length > 0) {
1462 as->urb->transfer_buffer = kmalloc(uurb->buffer_length,
1464 if (!as->urb->transfer_buffer) {
1470 if (copy_from_user(as->urb->transfer_buffer,
1472 uurb->buffer_length)) {
1476 } else if (uurb->type == USBDEVFS_URB_TYPE_ISO) {
1478 * Isochronous input data may end up being
1479 * discontiguous if some of the packets are short.
1480 * Clear the buffer so that the gaps don't leak
1481 * kernel data to userspace.
1483 memset(as->urb->transfer_buffer, 0,
1484 uurb->buffer_length);
1487 as->urb->dev = ps->dev;
1488 as->urb->pipe = (uurb->type << 30) |
1489 __create_pipe(ps->dev, uurb->endpoint & 0xf) |
1490 (uurb->endpoint & USB_DIR_IN);
1492 /* This tedious sequence is necessary because the URB_* flags
1493 * are internal to the kernel and subject to change, whereas
1494 * the USBDEVFS_URB_* flags are a user API and must not be changed.
1496 u = (is_in ? URB_DIR_IN : URB_DIR_OUT);
1497 if (uurb->flags & USBDEVFS_URB_ISO_ASAP)
1499 if (uurb->flags & USBDEVFS_URB_SHORT_NOT_OK && is_in)
1500 u |= URB_SHORT_NOT_OK;
1501 if (uurb->flags & USBDEVFS_URB_NO_FSBR)
1503 if (uurb->flags & USBDEVFS_URB_ZERO_PACKET)
1504 u |= URB_ZERO_PACKET;
1505 if (uurb->flags & USBDEVFS_URB_NO_INTERRUPT)
1506 u |= URB_NO_INTERRUPT;
1507 as->urb->transfer_flags = u;
1509 as->urb->transfer_buffer_length = uurb->buffer_length;
1510 as->urb->setup_packet = (unsigned char *)dr;
1512 as->urb->start_frame = uurb->start_frame;
1513 as->urb->number_of_packets = number_of_packets;
1514 as->urb->stream_id = stream_id;
1515 if (uurb->type == USBDEVFS_URB_TYPE_ISO ||
1516 ps->dev->speed == USB_SPEED_HIGH)
1517 as->urb->interval = 1 << min(15, ep->desc.bInterval - 1);
1519 as->urb->interval = ep->desc.bInterval;
1520 as->urb->context = as;
1521 as->urb->complete = async_completed;
1522 for (totlen = u = 0; u < number_of_packets; u++) {
1523 as->urb->iso_frame_desc[u].offset = totlen;
1524 as->urb->iso_frame_desc[u].length = isopkt[u].length;
1525 totlen += isopkt[u].length;
1531 if (is_in && uurb->buffer_length > 0)
1532 as->userbuffer = uurb->buffer;
1534 as->userbuffer = NULL;
1535 as->signr = uurb->signr;
1537 as->pid = get_pid(task_pid(current));
1538 as->cred = get_current_cred();
1539 security_task_getsecid(current, &as->secid);
1540 snoop_urb(ps->dev, as->userurb, as->urb->pipe,
1541 as->urb->transfer_buffer_length, 0, SUBMIT,
1544 snoop_urb_data(as->urb, as->urb->transfer_buffer_length);
1546 async_newpending(as);
1548 if (usb_endpoint_xfer_bulk(&ep->desc)) {
1549 spin_lock_irq(&ps->lock);
1551 /* Not exactly the endpoint address; the direction bit is
1552 * shifted to the 0x10 position so that the value will be
1555 as->bulk_addr = usb_endpoint_num(&ep->desc) |
1556 ((ep->desc.bEndpointAddress & USB_ENDPOINT_DIR_MASK)
1559 /* If this bulk URB is the start of a new transfer, re-enable
1560 * the endpoint. Otherwise mark it as a continuation URB.
1562 if (uurb->flags & USBDEVFS_URB_BULK_CONTINUATION)
1563 as->bulk_status = AS_CONTINUATION;
1565 ps->disabled_bulk_eps &= ~(1 << as->bulk_addr);
1567 /* Don't accept continuation URBs if the endpoint is
1568 * disabled because of an earlier error.
1570 if (ps->disabled_bulk_eps & (1 << as->bulk_addr))
1573 ret = usb_submit_urb(as->urb, GFP_ATOMIC);
1574 spin_unlock_irq(&ps->lock);
1576 ret = usb_submit_urb(as->urb, GFP_KERNEL);
1580 dev_printk(KERN_DEBUG, &ps->dev->dev,
1581 "usbfs: usb_submit_urb returned %d\n", ret);
1582 snoop_urb(ps->dev, as->userurb, as->urb->pipe,
1583 0, ret, COMPLETE, NULL, 0);
1584 async_removepending(as);
1597 static int proc_submiturb(struct usb_dev_state *ps, void __user *arg)
1599 struct usbdevfs_urb uurb;
1601 if (copy_from_user(&uurb, arg, sizeof(uurb)))
1604 return proc_do_submiturb(ps, &uurb,
1605 (((struct usbdevfs_urb __user *)arg)->iso_frame_desc),
1609 static int proc_unlinkurb(struct usb_dev_state *ps, void __user *arg)
1613 unsigned long flags;
1615 spin_lock_irqsave(&ps->lock, flags);
1616 as = async_getpending(ps, arg);
1618 spin_unlock_irqrestore(&ps->lock, flags);
1624 spin_unlock_irqrestore(&ps->lock, flags);
1632 static int processcompl(struct async *as, void __user * __user *arg)
1634 struct urb *urb = as->urb;
1635 struct usbdevfs_urb __user *userurb = as->userurb;
1636 void __user *addr = as->userurb;
1639 if (as->userbuffer && urb->actual_length) {
1640 if (copy_urb_data_to_user(as->userbuffer, urb))
1643 if (put_user(as->status, &userurb->status))
1645 if (put_user(urb->actual_length, &userurb->actual_length))
1647 if (put_user(urb->error_count, &userurb->error_count))
1650 if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
1651 for (i = 0; i < urb->number_of_packets; i++) {
1652 if (put_user(urb->iso_frame_desc[i].actual_length,
1653 &userurb->iso_frame_desc[i].actual_length))
1655 if (put_user(urb->iso_frame_desc[i].status,
1656 &userurb->iso_frame_desc[i].status))
1661 if (put_user(addr, (void __user * __user *)arg))
1669 static struct async *reap_as(struct usb_dev_state *ps)
1671 DECLARE_WAITQUEUE(wait, current);
1672 struct async *as = NULL;
1673 struct usb_device *dev = ps->dev;
1675 add_wait_queue(&ps->wait, &wait);
1677 __set_current_state(TASK_INTERRUPTIBLE);
1678 as = async_getcompleted(ps);
1679 if (as || !connected(ps))
1681 if (signal_pending(current))
1683 usb_unlock_device(dev);
1685 usb_lock_device(dev);
1687 remove_wait_queue(&ps->wait, &wait);
1688 set_current_state(TASK_RUNNING);
1692 static int proc_reapurb(struct usb_dev_state *ps, void __user *arg)
1694 struct async *as = reap_as(ps);
1699 snoop(&ps->dev->dev, "reap %p\n", as->userurb);
1700 retval = processcompl(as, (void __user * __user *)arg);
1704 if (signal_pending(current))
1709 static int proc_reapurbnonblock(struct usb_dev_state *ps, void __user *arg)
1714 as = async_getcompleted(ps);
1716 snoop(&ps->dev->dev, "reap %p\n", as->userurb);
1717 retval = processcompl(as, (void __user * __user *)arg);
1720 retval = (connected(ps) ? -EAGAIN : -ENODEV);
1725 #ifdef CONFIG_COMPAT
1726 static int proc_control_compat(struct usb_dev_state *ps,
1727 struct usbdevfs_ctrltransfer32 __user *p32)
1729 struct usbdevfs_ctrltransfer __user *p;
1731 p = compat_alloc_user_space(sizeof(*p));
1732 if (copy_in_user(p, p32, (sizeof(*p32) - sizeof(compat_caddr_t))) ||
1733 get_user(udata, &p32->data) ||
1734 put_user(compat_ptr(udata), &p->data))
1736 return proc_control(ps, p);
1739 static int proc_bulk_compat(struct usb_dev_state *ps,
1740 struct usbdevfs_bulktransfer32 __user *p32)
1742 struct usbdevfs_bulktransfer __user *p;
1744 compat_caddr_t addr;
1746 p = compat_alloc_user_space(sizeof(*p));
1748 if (get_user(n, &p32->ep) || put_user(n, &p->ep) ||
1749 get_user(n, &p32->len) || put_user(n, &p->len) ||
1750 get_user(n, &p32->timeout) || put_user(n, &p->timeout) ||
1751 get_user(addr, &p32->data) || put_user(compat_ptr(addr), &p->data))
1754 return proc_bulk(ps, p);
1756 static int proc_disconnectsignal_compat(struct usb_dev_state *ps, void __user *arg)
1758 struct usbdevfs_disconnectsignal32 ds;
1760 if (copy_from_user(&ds, arg, sizeof(ds)))
1762 ps->discsignr = ds.signr;
1763 ps->disccontext = compat_ptr(ds.context);
1767 static int get_urb32(struct usbdevfs_urb *kurb,
1768 struct usbdevfs_urb32 __user *uurb)
1771 if (!access_ok(VERIFY_READ, uurb, sizeof(*uurb)) ||
1772 __get_user(kurb->type, &uurb->type) ||
1773 __get_user(kurb->endpoint, &uurb->endpoint) ||
1774 __get_user(kurb->status, &uurb->status) ||
1775 __get_user(kurb->flags, &uurb->flags) ||
1776 __get_user(kurb->buffer_length, &uurb->buffer_length) ||
1777 __get_user(kurb->actual_length, &uurb->actual_length) ||
1778 __get_user(kurb->start_frame, &uurb->start_frame) ||
1779 __get_user(kurb->number_of_packets, &uurb->number_of_packets) ||
1780 __get_user(kurb->error_count, &uurb->error_count) ||
1781 __get_user(kurb->signr, &uurb->signr))
1784 if (__get_user(uptr, &uurb->buffer))
1786 kurb->buffer = compat_ptr(uptr);
1787 if (__get_user(uptr, &uurb->usercontext))
1789 kurb->usercontext = compat_ptr(uptr);
1794 static int proc_submiturb_compat(struct usb_dev_state *ps, void __user *arg)
1796 struct usbdevfs_urb uurb;
1798 if (get_urb32(&uurb, (struct usbdevfs_urb32 __user *)arg))
1801 return proc_do_submiturb(ps, &uurb,
1802 ((struct usbdevfs_urb32 __user *)arg)->iso_frame_desc,
1806 static int processcompl_compat(struct async *as, void __user * __user *arg)
1808 struct urb *urb = as->urb;
1809 struct usbdevfs_urb32 __user *userurb = as->userurb;
1810 void __user *addr = as->userurb;
1813 if (as->userbuffer && urb->actual_length) {
1814 if (copy_urb_data_to_user(as->userbuffer, urb))
1817 if (put_user(as->status, &userurb->status))
1819 if (put_user(urb->actual_length, &userurb->actual_length))
1821 if (put_user(urb->error_count, &userurb->error_count))
1824 if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
1825 for (i = 0; i < urb->number_of_packets; i++) {
1826 if (put_user(urb->iso_frame_desc[i].actual_length,
1827 &userurb->iso_frame_desc[i].actual_length))
1829 if (put_user(urb->iso_frame_desc[i].status,
1830 &userurb->iso_frame_desc[i].status))
1835 if (put_user(ptr_to_compat(addr), (u32 __user *)arg))
1840 static int proc_reapurb_compat(struct usb_dev_state *ps, void __user *arg)
1842 struct async *as = reap_as(ps);
1847 snoop(&ps->dev->dev, "reap %p\n", as->userurb);
1848 retval = processcompl_compat(as, (void __user * __user *)arg);
1852 if (signal_pending(current))
1857 static int proc_reapurbnonblock_compat(struct usb_dev_state *ps, void __user *arg)
1862 as = async_getcompleted(ps);
1864 snoop(&ps->dev->dev, "reap %p\n", as->userurb);
1865 retval = processcompl_compat(as, (void __user * __user *)arg);
1868 retval = (connected(ps) ? -EAGAIN : -ENODEV);
1876 static int proc_disconnectsignal(struct usb_dev_state *ps, void __user *arg)
1878 struct usbdevfs_disconnectsignal ds;
1880 if (copy_from_user(&ds, arg, sizeof(ds)))
1882 ps->discsignr = ds.signr;
1883 ps->disccontext = ds.context;
1887 static int proc_claiminterface(struct usb_dev_state *ps, void __user *arg)
1891 if (get_user(ifnum, (unsigned int __user *)arg))
1893 return claimintf(ps, ifnum);
1896 static int proc_releaseinterface(struct usb_dev_state *ps, void __user *arg)
1901 if (get_user(ifnum, (unsigned int __user *)arg))
1903 ret = releaseintf(ps, ifnum);
1906 destroy_async_on_interface (ps, ifnum);
1910 static int proc_ioctl(struct usb_dev_state *ps, struct usbdevfs_ioctl *ctl)
1915 struct usb_interface *intf = NULL;
1916 struct usb_driver *driver = NULL;
1919 size = _IOC_SIZE(ctl->ioctl_code);
1921 buf = kmalloc(size, GFP_KERNEL);
1924 if ((_IOC_DIR(ctl->ioctl_code) & _IOC_WRITE)) {
1925 if (copy_from_user(buf, ctl->data, size)) {
1930 memset(buf, 0, size);
1934 if (!connected(ps)) {
1939 if (ps->dev->state != USB_STATE_CONFIGURED)
1940 retval = -EHOSTUNREACH;
1941 else if (!(intf = usb_ifnum_to_if(ps->dev, ctl->ifno)))
1943 else switch (ctl->ioctl_code) {
1945 /* disconnect kernel driver from interface */
1946 case USBDEVFS_DISCONNECT:
1947 if (intf->dev.driver) {
1948 driver = to_usb_driver(intf->dev.driver);
1949 dev_dbg(&intf->dev, "disconnect by usbfs\n");
1950 usb_driver_release_interface(driver, intf);
1955 /* let kernel drivers try to (re)bind to the interface */
1956 case USBDEVFS_CONNECT:
1957 if (!intf->dev.driver)
1958 retval = device_attach(&intf->dev);
1963 /* talk directly to the interface's driver */
1965 if (intf->dev.driver)
1966 driver = to_usb_driver(intf->dev.driver);
1967 if (driver == NULL || driver->unlocked_ioctl == NULL) {
1970 retval = driver->unlocked_ioctl(intf, ctl->ioctl_code, buf);
1971 if (retval == -ENOIOCTLCMD)
1976 /* cleanup and return */
1978 && (_IOC_DIR(ctl->ioctl_code) & _IOC_READ) != 0
1980 && copy_to_user(ctl->data, buf, size) != 0)
1987 static int proc_ioctl_default(struct usb_dev_state *ps, void __user *arg)
1989 struct usbdevfs_ioctl ctrl;
1991 if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
1993 return proc_ioctl(ps, &ctrl);
1996 #ifdef CONFIG_COMPAT
1997 static int proc_ioctl_compat(struct usb_dev_state *ps, compat_uptr_t arg)
1999 struct usbdevfs_ioctl32 __user *uioc;
2000 struct usbdevfs_ioctl ctrl;
2003 uioc = compat_ptr((long)arg);
2004 if (!access_ok(VERIFY_READ, uioc, sizeof(*uioc)) ||
2005 __get_user(ctrl.ifno, &uioc->ifno) ||
2006 __get_user(ctrl.ioctl_code, &uioc->ioctl_code) ||
2007 __get_user(udata, &uioc->data))
2009 ctrl.data = compat_ptr(udata);
2011 return proc_ioctl(ps, &ctrl);
2015 static int proc_claim_port(struct usb_dev_state *ps, void __user *arg)
2020 if (get_user(portnum, (unsigned __user *) arg))
2022 rc = usb_hub_claim_port(ps->dev, portnum, ps);
2024 snoop(&ps->dev->dev, "port %d claimed by process %d: %s\n",
2025 portnum, task_pid_nr(current), current->comm);
2029 static int proc_release_port(struct usb_dev_state *ps, void __user *arg)
2033 if (get_user(portnum, (unsigned __user *) arg))
2035 return usb_hub_release_port(ps->dev, portnum, ps);
2038 static int proc_get_capabilities(struct usb_dev_state *ps, void __user *arg)
2042 caps = USBDEVFS_CAP_ZERO_PACKET | USBDEVFS_CAP_NO_PACKET_SIZE_LIM |
2043 USBDEVFS_CAP_REAP_AFTER_DISCONNECT;
2044 if (!ps->dev->bus->no_stop_on_short)
2045 caps |= USBDEVFS_CAP_BULK_CONTINUATION;
2046 if (ps->dev->bus->sg_tablesize)
2047 caps |= USBDEVFS_CAP_BULK_SCATTER_GATHER;
2049 if (put_user(caps, (__u32 __user *)arg))
2055 static int proc_disconnect_claim(struct usb_dev_state *ps, void __user *arg)
2057 struct usbdevfs_disconnect_claim dc;
2058 struct usb_interface *intf;
2060 if (copy_from_user(&dc, arg, sizeof(dc)))
2063 intf = usb_ifnum_to_if(ps->dev, dc.interface);
2067 if (intf->dev.driver) {
2068 struct usb_driver *driver = to_usb_driver(intf->dev.driver);
2070 if ((dc.flags & USBDEVFS_DISCONNECT_CLAIM_IF_DRIVER) &&
2071 strncmp(dc.driver, intf->dev.driver->name,
2072 sizeof(dc.driver)) != 0)
2075 if ((dc.flags & USBDEVFS_DISCONNECT_CLAIM_EXCEPT_DRIVER) &&
2076 strncmp(dc.driver, intf->dev.driver->name,
2077 sizeof(dc.driver)) == 0)
2080 dev_dbg(&intf->dev, "disconnect by usbfs\n");
2081 usb_driver_release_interface(driver, intf);
2084 return claimintf(ps, dc.interface);
2087 static int proc_alloc_streams(struct usb_dev_state *ps, void __user *arg)
2089 unsigned num_streams, num_eps;
2090 struct usb_host_endpoint **eps;
2091 struct usb_interface *intf;
2094 r = parse_usbdevfs_streams(ps, arg, &num_streams, &num_eps,
2099 destroy_async_on_interface(ps,
2100 intf->altsetting[0].desc.bInterfaceNumber);
2102 r = usb_alloc_streams(intf, eps, num_eps, num_streams, GFP_KERNEL);
2107 static int proc_free_streams(struct usb_dev_state *ps, void __user *arg)
2110 struct usb_host_endpoint **eps;
2111 struct usb_interface *intf;
2114 r = parse_usbdevfs_streams(ps, arg, NULL, &num_eps, &eps, &intf);
2118 destroy_async_on_interface(ps,
2119 intf->altsetting[0].desc.bInterfaceNumber);
2121 r = usb_free_streams(intf, eps, num_eps, GFP_KERNEL);
2127 * NOTE: All requests here that have interface numbers as parameters
2128 * are assuming that somehow the configuration has been prevented from
2129 * changing. But there's no mechanism to ensure that...
2131 static long usbdev_do_ioctl(struct file *file, unsigned int cmd,
2134 struct usb_dev_state *ps = file->private_data;
2135 struct inode *inode = file_inode(file);
2136 struct usb_device *dev = ps->dev;
2139 if (!(file->f_mode & FMODE_WRITE))
2142 usb_lock_device(dev);
2144 /* Reap operations are allowed even after disconnection */
2146 case USBDEVFS_REAPURB:
2147 snoop(&dev->dev, "%s: REAPURB\n", __func__);
2148 ret = proc_reapurb(ps, p);
2151 case USBDEVFS_REAPURBNDELAY:
2152 snoop(&dev->dev, "%s: REAPURBNDELAY\n", __func__);
2153 ret = proc_reapurbnonblock(ps, p);
2156 #ifdef CONFIG_COMPAT
2157 case USBDEVFS_REAPURB32:
2158 snoop(&dev->dev, "%s: REAPURB32\n", __func__);
2159 ret = proc_reapurb_compat(ps, p);
2162 case USBDEVFS_REAPURBNDELAY32:
2163 snoop(&dev->dev, "%s: REAPURBNDELAY32\n", __func__);
2164 ret = proc_reapurbnonblock_compat(ps, p);
2169 if (!connected(ps)) {
2170 usb_unlock_device(dev);
2175 case USBDEVFS_CONTROL:
2176 snoop(&dev->dev, "%s: CONTROL\n", __func__);
2177 ret = proc_control(ps, p);
2179 inode->i_mtime = CURRENT_TIME;
2183 snoop(&dev->dev, "%s: BULK\n", __func__);
2184 ret = proc_bulk(ps, p);
2186 inode->i_mtime = CURRENT_TIME;
2189 case USBDEVFS_RESETEP:
2190 snoop(&dev->dev, "%s: RESETEP\n", __func__);
2191 ret = proc_resetep(ps, p);
2193 inode->i_mtime = CURRENT_TIME;
2196 case USBDEVFS_RESET:
2197 snoop(&dev->dev, "%s: RESET\n", __func__);
2198 ret = proc_resetdevice(ps);
2201 case USBDEVFS_CLEAR_HALT:
2202 snoop(&dev->dev, "%s: CLEAR_HALT\n", __func__);
2203 ret = proc_clearhalt(ps, p);
2205 inode->i_mtime = CURRENT_TIME;
2208 case USBDEVFS_GETDRIVER:
2209 snoop(&dev->dev, "%s: GETDRIVER\n", __func__);
2210 ret = proc_getdriver(ps, p);
2213 case USBDEVFS_CONNECTINFO:
2214 snoop(&dev->dev, "%s: CONNECTINFO\n", __func__);
2215 ret = proc_connectinfo(ps, p);
2218 case USBDEVFS_SETINTERFACE:
2219 snoop(&dev->dev, "%s: SETINTERFACE\n", __func__);
2220 ret = proc_setintf(ps, p);
2223 case USBDEVFS_SETCONFIGURATION:
2224 snoop(&dev->dev, "%s: SETCONFIGURATION\n", __func__);
2225 ret = proc_setconfig(ps, p);
2228 case USBDEVFS_SUBMITURB:
2229 snoop(&dev->dev, "%s: SUBMITURB\n", __func__);
2230 ret = proc_submiturb(ps, p);
2232 inode->i_mtime = CURRENT_TIME;
2235 #ifdef CONFIG_COMPAT
2236 case USBDEVFS_CONTROL32:
2237 snoop(&dev->dev, "%s: CONTROL32\n", __func__);
2238 ret = proc_control_compat(ps, p);
2240 inode->i_mtime = CURRENT_TIME;
2243 case USBDEVFS_BULK32:
2244 snoop(&dev->dev, "%s: BULK32\n", __func__);
2245 ret = proc_bulk_compat(ps, p);
2247 inode->i_mtime = CURRENT_TIME;
2250 case USBDEVFS_DISCSIGNAL32:
2251 snoop(&dev->dev, "%s: DISCSIGNAL32\n", __func__);
2252 ret = proc_disconnectsignal_compat(ps, p);
2255 case USBDEVFS_SUBMITURB32:
2256 snoop(&dev->dev, "%s: SUBMITURB32\n", __func__);
2257 ret = proc_submiturb_compat(ps, p);
2259 inode->i_mtime = CURRENT_TIME;
2262 case USBDEVFS_IOCTL32:
2263 snoop(&dev->dev, "%s: IOCTL32\n", __func__);
2264 ret = proc_ioctl_compat(ps, ptr_to_compat(p));
2268 case USBDEVFS_DISCARDURB:
2269 snoop(&dev->dev, "%s: DISCARDURB %p\n", __func__, p);
2270 ret = proc_unlinkurb(ps, p);
2273 case USBDEVFS_DISCSIGNAL:
2274 snoop(&dev->dev, "%s: DISCSIGNAL\n", __func__);
2275 ret = proc_disconnectsignal(ps, p);
2278 case USBDEVFS_CLAIMINTERFACE:
2279 snoop(&dev->dev, "%s: CLAIMINTERFACE\n", __func__);
2280 ret = proc_claiminterface(ps, p);
2283 case USBDEVFS_RELEASEINTERFACE:
2284 snoop(&dev->dev, "%s: RELEASEINTERFACE\n", __func__);
2285 ret = proc_releaseinterface(ps, p);
2288 case USBDEVFS_IOCTL:
2289 snoop(&dev->dev, "%s: IOCTL\n", __func__);
2290 ret = proc_ioctl_default(ps, p);
2293 case USBDEVFS_CLAIM_PORT:
2294 snoop(&dev->dev, "%s: CLAIM_PORT\n", __func__);
2295 ret = proc_claim_port(ps, p);
2298 case USBDEVFS_RELEASE_PORT:
2299 snoop(&dev->dev, "%s: RELEASE_PORT\n", __func__);
2300 ret = proc_release_port(ps, p);
2302 case USBDEVFS_GET_CAPABILITIES:
2303 ret = proc_get_capabilities(ps, p);
2305 case USBDEVFS_DISCONNECT_CLAIM:
2306 ret = proc_disconnect_claim(ps, p);
2308 case USBDEVFS_ALLOC_STREAMS:
2309 ret = proc_alloc_streams(ps, p);
2311 case USBDEVFS_FREE_STREAMS:
2312 ret = proc_free_streams(ps, p);
2317 usb_unlock_device(dev);
2319 inode->i_atime = CURRENT_TIME;
2323 static long usbdev_ioctl(struct file *file, unsigned int cmd,
2328 ret = usbdev_do_ioctl(file, cmd, (void __user *)arg);
2333 #ifdef CONFIG_COMPAT
2334 static long usbdev_compat_ioctl(struct file *file, unsigned int cmd,
2339 ret = usbdev_do_ioctl(file, cmd, compat_ptr(arg));
2345 /* No kernel lock - fine */
2346 static unsigned int usbdev_poll(struct file *file,
2347 struct poll_table_struct *wait)
2349 struct usb_dev_state *ps = file->private_data;
2350 unsigned int mask = 0;
2352 poll_wait(file, &ps->wait, wait);
2353 if (file->f_mode & FMODE_WRITE && !list_empty(&ps->async_completed))
2354 mask |= POLLOUT | POLLWRNORM;
2356 mask |= POLLERR | POLLHUP;
2360 const struct file_operations usbdev_file_operations = {
2361 .owner = THIS_MODULE,
2362 .llseek = no_seek_end_llseek,
2363 .read = usbdev_read,
2364 .poll = usbdev_poll,
2365 .unlocked_ioctl = usbdev_ioctl,
2366 #ifdef CONFIG_COMPAT
2367 .compat_ioctl = usbdev_compat_ioctl,
2369 .open = usbdev_open,
2370 .release = usbdev_release,
2373 static void usbdev_remove(struct usb_device *udev)
2375 struct usb_dev_state *ps;
2376 struct siginfo sinfo;
2378 while (!list_empty(&udev->filelist)) {
2379 ps = list_entry(udev->filelist.next, struct usb_dev_state, list);
2380 destroy_all_async(ps);
2381 wake_up_all(&ps->wait);
2382 list_del_init(&ps->list);
2383 if (ps->discsignr) {
2384 memset(&sinfo, 0, sizeof(sinfo));
2385 sinfo.si_signo = ps->discsignr;
2386 sinfo.si_errno = EPIPE;
2387 sinfo.si_code = SI_ASYNCIO;
2388 sinfo.si_addr = ps->disccontext;
2389 kill_pid_info_as_cred(ps->discsignr, &sinfo,
2390 ps->disc_pid, ps->cred, ps->secid);
2395 static int usbdev_notify(struct notifier_block *self,
2396 unsigned long action, void *dev)
2399 case USB_DEVICE_ADD:
2401 case USB_DEVICE_REMOVE:
2408 static struct notifier_block usbdev_nb = {
2409 .notifier_call = usbdev_notify,
2412 static struct cdev usb_device_cdev;
2414 int __init usb_devio_init(void)
2418 retval = register_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX,
2421 printk(KERN_ERR "Unable to register minors for usb_device\n");
2424 cdev_init(&usb_device_cdev, &usbdev_file_operations);
2425 retval = cdev_add(&usb_device_cdev, USB_DEVICE_DEV, USB_DEVICE_MAX);
2427 printk(KERN_ERR "Unable to get usb_device major %d\n",
2431 usb_register_notify(&usbdev_nb);
2436 unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
2440 void usb_devio_cleanup(void)
2442 usb_unregister_notify(&usbdev_nb);
2443 cdev_del(&usb_device_cdev);
2444 unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);